Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    National Plumbing Code
                                                                                                    of Canada
                                                                                                    2020




                                                                                                    Issued by the
                                                                                                    Canadian Commission on Building and Fire Codes
                                                                                                    National Research Council of Canada
                                                                                                                  First Edition 1970




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                Second Edition 1975
                                                                                                                  Third Edition 1977
                                                                                                                 Fourth Edition 1980
                                                                                                                  Fifth Edition 1985
                                                                                                                  Sixth Edition 1990
                                                                                                                Seventh Edition 1995
                                                                                                                 Eighth Edition 2005
                                                                                                                 Ninth Edition 2010
                                                                                                                 Tenth Edition 2015
                                                                                                                Eleventh Edition 2020



                                                                                                    Paper:   ISBN 978-0-660-37918-0      NR24-29/2020E
                                                                                                    PDF:     ISBN 978-0-660-37916-6      NR24-29/2020E-PDF



                                                                                                                NRCC-CONST-56436E

                                                                                                     © National Research Council of Canada 2022
                                                                                                                       Ottawa
                                                                                                                World Rights Reserved




                                                                                                                  Printed in Canada

                                                                                                                     First Printing




                                                                                                             Aussi disponible en français :
                                                                                                     Code national de la plomberie – Canada 2020
                                                                                                                NRCC-CONST-56436F
                                                                                                          Papier : ISBN 978-0-660-37919-7
                                                                                                          PDF : ISBN 978-0-660-37917-3
                                                                                                    Table of Contents

                                                                                                      Preface
                                                                                                      Relationship of the NPC to Standards Development and Conformity Assessment
                                                                                                      Canadian Commission on Building and Fire Codes and Standing Committees

                                                                                                      Division A          Compliance, Objectives and Functional Statements




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                         Part 1              Compliance
                                                                                                         Part 2              Objectives
                                                                                                         Part 3              Functional Statements

                                                                                                      Division B          Acceptable Solutions
                                                                                                         Part 1              General
                                                                                                         Part 2              Plumbing Systems

                                                                                                      Division C          Administrative Provisions
                                                                                                         Part 1              General
                                                                                                         Part 2              Administrative Provisions

                                                                                                      Index




                                                                                                    National Plumbing Code of Canada 2020
                                        Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




National Plumbing Code of Canada 2020
                                                                                                    Preface



                                                                                                        The National Plumbing Code of Canada 2020 (NPC), together with the National Building




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                        Code of Canada 2020 (NBC), the National Energy Code of Canada for Buildings 2020 (NECB)
                                                                                                        and the National Fire Code of Canada 2020 (NFC), has been developed by the Canadian
                                                                                                        Commission on Building and Fire Codes (CCBFC) as an objective-based national model code
                                                                                                        that can be adopted by provincial and territorial governments.

                                                                                                        In Canada, provincial and territorial governments have the authority to enact legislation that
                                                                                                        regulates the design and installation of plumbing systems within their jurisdictions. This may
                                                                                                        involve the adoption of the NPC without change or with modifications to suit local needs,
                                                                                                        and the enactment of other laws and regulations regarding plumbing system design and
                                                                                                        installation, including requirements for professional involvement.

                                                                                                        The NPC is a model code in the sense that it helps promote consistency among provincial
                                                                                                        and territorial plumbing codes. Persons involved in the design or installation of plumbing
                                                                                                        systems should consult the provincial or territorial jurisdiction concerned to find out which
                                                                                                        plumbing code is applicable.

                                                                                                        This edition of the NPC succeeds the 2015 edition.


                                                                                                    Development of the National Model Codes
                                                                                                        The CCBFC, an independent committee established by the National Research Council of
                                                                                                        Canada (NRC), is responsible for the content of the National Model Codes. The CCBFC
                                                                                                        is made up of volunteers from across the country and from all facets of the Codes-user
                                                                                                        community. Members of the CCBFC and its standing committees include builders, engineers,
                                                                                                        skilled trade workers, architects, building owners, building operators, fire and building
                                                                                                        officials, manufacturers, and representatives of general interests.

                                                                                                        The CCBFC is advised on scope, policy and technical issues pertaining to the Codes by the
                                                                                                        Provincial/Territorial Policy Advisory Committee on Codes (PTPACC), which is a committee
                                                                                                        of senior representatives from provincial/territorial ministries responsible for building,
                                                                                                        fire, plumbing, and energy regulation in their jurisdictions. The PTPACC was created by
                                                                                                        the provinces and territories, with provision of guidance to the CCBFC as one of its main
                                                                                                        functions. Through the PTPACC, the provinces and territories are engaged in every phase of
                                                                                                        the Codes development process.

                                                                                                        Codes Canada staff within the Construction Research Centre at the NRC provide technical
                                                                                                        and administrative support to the CCBFC and its standing committees, and coordinate the
                                                                                                        provision of evidence-based research to inform Codes development. The NRC publishes the
                                                                                                        National Model Codes and periodic revisions to the Codes to address pressing issues.

                                                                                                        The broader Codes-user community also makes significant contributions to the Codes
                                                                                                        development process by submitting requests for changes or additions to the Codes and by
                                                                                                        commenting on the proposed changes during the public reviews that precede each new
                                                                                                        edition.

                                                                                                        The CCBFC takes into consideration the advice received from the provinces and territories as
                                                                                                        well as Codes users' comments at each stage of Codes development. The scope and content of
                                                                                                        the National Model Codes are determined on a consensus basis, which involves the review of
                                                                                                        technical, policy and practical concerns and discussion of the implications of these concerns.


                                                                                                    National Plumbing Code of Canada 2020                                                                v
                                                                                                                                                                                                          Preface

                                                                                                         More information on the Codes development process is available on the NRC's website.


                                                                                                    National Plumbing Code of Canada 2020
                                                                                                         The NPC sets out technical provisions for the design and installation of new plumbing
                                                                                                         systems. It also applies to the extension, alteration, renewal and repair of existing plumbing
                                                                                                         systems.

                                                                                                         The NPC establishes requirements to address the following four objectives:
                                                                                                           • safety
                                                                                                           • health




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                           • protection of the building or facility from water and sewage damage
                                                                                                           • environment

                                                                                                         Code provisions do not necessarily address all the characteristics of buildings and facilities
                                                                                                         that might be considered to have a bearing on the Code's objectives. Through the extensive
                                                                                                         consensus process used to develop and maintain the National Model Codes (see the section
                                                                                                         entitled Development of the National Model Codes), the Codes-user community has decided
                                                                                                         which characteristics should be regulated through the NPC.

                                                                                                         The provisions of the NPC can be considered as the minimum acceptable measures required
                                                                                                         to adequately achieve the above-listed objectives, as recommended by the CCBFC. Once they
                                                                                                         are adopted into law or regulation by an authority having jurisdiction, the provisions become
                                                                                                         minimum acceptable requirements representing the minimum level of performance required
                                                                                                         to achieve the objectives that is acceptable to the adopting authority.

                                                                                                         The NPC is a model code which, when adopted or adapted by a province or territory, becomes
                                                                                                         a regulation. It is not a guideline on plumbing system design or installation. The design of a
                                                                                                         technically sound plumbing system depends upon many factors beyond compliance with
                                                                                                         plumbing regulations. Such factors include the availability of knowledgeable practitioners
                                                                                                         who have received appropriate education, training and experience and who are familiar
                                                                                                         with the principles of good plumbing practice and experience using reference manuals and
                                                                                                         technical guides.

                                                                                                         The NPC does not list acceptable proprietary plumbing products. It establishes the criteria
                                                                                                         that plumbing materials, products and assemblies must meet. Some of these criteria are
                                                                                                         explicitly stated in the NPC while others are incorporated by reference to material or product
                                                                                                         standards published by standards development organizations. Only those portions of the
                                                                                                         standards related to the objectives of this Code are mandatory parts of the NPC.

                                                                                                         Code Requirements
                                                                                                             Most NPC requirements address at least one of the Code's four stated objectives (safety,
                                                                                                             health, protection of the building or facility from water and sewage damage, and
                                                                                                             environment).

                                                                                                             In processing proposed changes or additions to any of the National Model Codes, the
                                                                                                             CCBFC considers many issues such as the following:
                                                                                                                • Does the proposed requirement provide the minimum level of performance—and
                                                                                                                  no more than the minimum—needed to achieve the Code's objectives?
                                                                                                                • Will persons responsible for Code compliance be able to act on or implement the
                                                                                                                  requirement using commonly accepted practices?
                                                                                                                • Will enforcement agencies be able to enforce the requirement?
                                                                                                                • Are the costs of implementing the requirement justifiable?
                                                                                                                • Have the potential policy implications of the requirement been identified and
                                                                                                                  addressed?
                                                                                                                • Is there broad consensus on this requirement among Code users representing all
                                                                                                                  facets of the plumbing system design and construction industries, as well as among
                                                                                                                  provincial and territorial governments?

                                                                                                             Guidelines for requesting changes to the NPC are available on the NRC's website.


                                                                                                    vi                                                                             National Plumbing Code of Canada 2020
                                                                                                    Preface

                                                                                                    Objective-Based Code Format

                                                                                                        The NPC has been published in an objective-based code format since 2005.

                                                                                                        As described in more detail in the section entitled Structure of the NPC, the Code comprises
                                                                                                        three Divisions:
                                                                                                           • Division A, which defines the scope of the Code and contains the objectives, the
                                                                                                             functional statements and the conditions necessary to achieve compliance;
                                                                                                           • Division B, which contains acceptable solutions (commonly referred to as “technical
                                                                                                             requirements”) deemed to satisfy the objectives and functional statements listed in
                                                                                                             Division A; and




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                           • Division C, which contains administrative provisions.

                                                                                                        Most of the requirements in Division B are linked to three types of information:
                                                                                                         • objectives (Code objectives, such as safety or health, which individual requirements
                                                                                                             help to address),
                                                                                                         • functional statements (statements of the functions of the plumbing system that a
                                                                                                             particular requirement helps to achieve), and
                                                                                                         • intent statements (detailed statements of the specific intent of the requirement).

                                                                                                        Objectives

                                                                                                            The NPC's objectives are fully defined in Section 2.2. of Division A.

                                                                                                            The objectives describe, in broad terms, the overall goals that the NPC's requirements are
                                                                                                            intended to achieve. They serve to define the boundaries of the subject areas the Code
                                                                                                            addresses. However, the Code does not address all the issues that might be considered
                                                                                                            to fall within those boundaries.

                                                                                                            The objectives describe undesirable situations and their consequences, which the Code
                                                                                                            aims to prevent from occurring in plumbing systems. The wording of most of the
                                                                                                            definitions of the objectives includes two key phrases: “limit the probability” and
                                                                                                            “unacceptable risk.” The phrase “limit the probability” is used to acknowledge that the
                                                                                                            NPC cannot entirely prevent those undesirable situations from happening. The phrase
                                                                                                            “unacceptable risk” acknowledges that the NPC cannot eliminate all risk: the “acceptable
                                                                                                            risk” is the risk remaining once compliance with the Code has been achieved.

                                                                                                            The objectives are entirely qualitative and are not intended to be used on their own in the
                                                                                                            design and approval processes.

                                                                                                            The objectives attributed to the requirements or portions of requirements in Division B
                                                                                                            are listed in a table in Section 2.8. of Division B.

                                                                                                        Functional Statements

                                                                                                            The NPC's functional statements are defined in Section 3.2. of Division A.

                                                                                                            The functional statements are more detailed than the objectives. They describe conditions
                                                                                                            in the plumbing system that help satisfy the objectives. The functional statements and the
                                                                                                            objectives are interconnected. There may be several functional statements related to any
                                                                                                            one objective, and a given functional statement may describe a function of the plumbing
                                                                                                            system that serves to achieve more than one objective.

                                                                                                            Like objectives, functional statements are entirely qualitative and are not intended to be
                                                                                                            used on their own in the design and approval processes.

                                                                                                            The functional statements attributed to the requirements or portions of requirements in
                                                                                                            Division B are listed in a table in Section 2.8. of Division B.


                                                                                                    National Plumbing Code of Canada 2020                                                                 vii
                                                                                                                                                                                                            Preface

                                                                                                           Intent Statements

                                                                                                               Intent statements explain the basic thinking behind each Code provision contained in
                                                                                                               Division B. Intent statements, each of which is unique to the provision with which it is
                                                                                                               associated, explain how requirements help to achieve their attributed objectives and
                                                                                                               functional statements. Like the objectives, the intent statements are expressed in terms
                                                                                                               of risk avoidance and expected performance. They offer insight into the views of the
                                                                                                               responsible standing committee on what the Code provisions are intended to achieve.

                                                                                                               The intent statements serve explanatory purposes only and do not form an integral part of
                                                                                                               the Code provisions. As such, they are similar in function to the explanatory Notes at the




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                               end of each Part. Due to the sheer volume of intent statements—hundreds for the NPC
                                                                                                               alone—they are made available as a separate electronic document entitled “Supplement
                                                                                                               to the NPC 2020: Intent Statements,” which is posted on the NRC's website.

                                                                                                           All this additional information—objectives, functional statements and intent statements—is
                                                                                                           intended to facilitate the implementation of the Code in two ways:
                                                                                                              • Clarity of intent: The objectives, functional statements and intent statements linked
                                                                                                                 to a Code requirement clarify the reasoning behind that requirement and facilitate
                                                                                                                 understanding of what must be done to satisfy that requirement. This added information
                                                                                                                 may also help avoid disputes between practitioners and officials over these types
                                                                                                                 of issues.
                                                                                                              • Flexibility: The additional information allows for flexibility in Code compliance. A
                                                                                                                 person seeking to propose a new method or material not described or covered in the
                                                                                                                 Code will be able to use the added information to understand the expected level of
                                                                                                                 performance that their alternative solution must achieve to satisfy the Code.


                                                                                                    Structure of the NPC

                                                                                                           The NPC is organized into three Divisions.

                                                                                                           Division A: Compliance, Objectives and Functional Statements

                                                                                                               Division A defines the scope of the NPC and presents the objectives that the Code
                                                                                                               addresses and the functions the plumbing system must perform to help to satisfy those
                                                                                                               objectives.

                                                                                                               Division A cannot be used on its own as a basis for designing and installing a plumbing
                                                                                                               system or for evaluating a plumbing system's compliance with the Code.

                                                                                                           Division B: Acceptable Solutions

                                                                                                               The term “acceptable solutions” refers to the technical requirements contained in the
                                                                                                               Code. It reflects the principle that plumbing codes establish an acceptable level of risk
                                                                                                               or performance and underlines the fact that a code cannot describe all possible valid
                                                                                                               design and installation options. Acceptable solutions represent the minimum level of
                                                                                                               performance that will satisfy the NPC's objectives and that is acceptable to an authority
                                                                                                               that adopts the NPC into law or regulation.

                                                                                                               Most of the requirements in Division B—the acceptable solutions—are linked to at least
                                                                                                               one objective and functional statement found in Division A. These linkages play an
                                                                                                               important role in allowing objective-based codes to accommodate innovation.

                                                                                                               It is expected that the majority of Code users will primarily follow the acceptable
                                                                                                               solutions presented in Division B and that they will consult Division A only when seeking
                                                                                                               clarification on the application of Division B's requirements to a particular situation,
                                                                                                               when considering an alternative solution, or when looking up the definition of selected
                                                                                                               terms in the context of the NPC.


                                                                                                    viii                                                                             National Plumbing Code of Canada 2020
                                                                                                    Preface

                                                                                                        Division C: Administrative Provisions

                                                                                                            Division C contains administrative provisions relating to the application of the Code.
                                                                                                            Many provinces and territories establish their own administrative provisions upon
                                                                                                            adopting or adapting the NPC; having all the administrative provisions in one Division
                                                                                                            facilitates their customization to suit jurisdictional needs.

                                                                                                            In addition, a separate document entitled Administrative Requirements for Use with
                                                                                                            the National Building Code of Canada 1985 is automatically adopted, in accordance
                                                                                                            with Article 2.2.1.1. of Division C, if the authority having jurisdiction does not provide
                                                                                                            other administrative requirements.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                        Relationship between Division A and Division B

                                                                                                            Sentence 1.2.1.1.(1) of Division A is a very important sentence: it is a precise statement of
                                                                                                            the relationship between Divisions A and B and is central to the concept of objective-based
                                                                                                            codes.

                                                                                                             1) Compliance with this Code shall be achieved by
                                                                                                             a) complying with the applicable acceptable solutions in Division B (see Note
                                                                                                                A-1.2.1.1.(1)(a)), or
                                                                                                             b) using alternative solutions that will achieve at least the minimum level of
                                                                                                                performance required by Division B in the areas defined by the objectives
                                                                                                                and functional statements attributed to the applicable acceptable solutions
                                                                                                                (see Note A-1.2.1.1.(1)(b)).

                                                                                                            Clause (a) makes it clear that the acceptable solutions in Division B are automatically
                                                                                                            deemed to satisfy the linked objectives and functional statements of Division A.

                                                                                                            Clause (b) makes it clear that alternative solutions can be used in lieu of compliance
                                                                                                            with the acceptable solutions. However, to do something different from the acceptable
                                                                                                            solutions described in Division B, a proponent must show that their proposed alternative
                                                                                                            solution will perform at least as well as the acceptable solution(s) it is replacing. The
                                                                                                            objectives and functional statements attributed to the acceptable solution(s) identify the
                                                                                                            areas of performance where this equivalence must be demonstrated.


                                                                                                    Additional Information

                                                                                                        Numbering System

                                                                                                            A consistent numbering system has been used throughout the National Model Codes. The
                                                                                                            first number indicates the Part of the Code; the second, the Section in the Part; the third,
                                                                                                            the Subsection; and the fourth, the Article in the Subsection. The detailed provisions are
                                                                                                            found at the Sentence level (indicated by numbers in brackets), and Sentences may be
                                                                                                            broken down into Clauses and Subclauses. This structure is illustrated as follows:

                                                                                                                      3                     Part
                                                                                                                      3.5.                  Section
                                                                                                                      3.5.2.                Subsection
                                                                                                                      3.5.2.1.              Article
                                                                                                                      3.5.2.1.(2)           Sentence
                                                                                                                      3.5.2.1.(2)(a)        Clause
                                                                                                                      3.5.2.1.(2)(a)(i)     Subclause




                                                                                                    National Plumbing Code of Canada 2020                                                                   ix
                                                                                                                                                                                                            Preface

                                                                                                        Meaning of the Words “And” and “Or” between the Clauses and Subclauses
                                                                                                        of a Sentence

                                                                                                           Multiple Clauses and Subclauses are connected by the word “and” or “or” at the end of
                                                                                                           the second last Clause or Subclause in the series. Although this connecting word appears
                                                                                                           only once, it is meant to apply to all the preceding Clauses or Subclauses within that series.

                                                                                                           For example, in a series of five Clauses—(a) to (e)—in a Sentence, the appearance of the
                                                                                                           word “and” at the end of Clause (d) means that all Clauses in the Sentence are connected
                                                                                                           to each other with the word “and.” Similarly, in a series of five Clauses—(a) to (e)—in a
                                                                                                           Sentence, the appearance of the word “or” at the end of Clause (d) means that all Clauses




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                           in the Sentence are connected to each other with the word “or.”

                                                                                                           In all cases, it is important to note that a Clause (and its Subclauses, if any) must always
                                                                                                           be read in conjunction with its introductory text appearing at the beginning of the
                                                                                                           Sentence. Moreover, the connecting words “and” and “or” must be read in the context
                                                                                                           of the Sentence. In particular, the use of the word “and” as a connecting word does not
                                                                                                           necessarily mean that all Clauses (or Subclauses) are applicable for compliance with
                                                                                                           the Sentence.

                                                                                                        Change Indication

                                                                                                           As a courtesy to Code users, efforts have been made to identify technical changes relative
                                                                                                           to the 2015 edition. Where a technical addition or revision has been made, a vertical line
                                                                                                           has been added in the margin next to the affected provision to indicate the approximate
                                                                                                           location of the new or revised content. No change indication is provided for editorial
                                                                                                           revisions or for renumbered or deleted content.

                                                                                                        Units

                                                                                                           All values in the NPC, other than nominal pipe sizes, are given in metric units. Some of
                                                                                                           the metric values in the Code have been converted and rounded from imperial values. A
                                                                                                           conversion table of imperial equivalents for the most common units used in plumbing
                                                                                                           system design and installation is located at the end of the Code.

                                                                                                        Complementary Publications

                                                                                                           The following publications are referenced in the NPC 2020 or facilitate the application
                                                                                                           of its requirements:
                                                                                                              National Building Code of Canada 2020
                                                                                                              Supplement to the NPC 2020: Intent Statements

                                                                                                           These and other Code documents published by the NRC are made available in free
                                                                                                           electronic format on the NRC's website.


                                                                                                    Commercial Reproduction
                                                                                                        Copyright for the NPC is owned by the NRC. All rights are reserved. Commercial
                                                                                                        reproduction by any means of the NRC's copyright material is prohibited without the written
                                                                                                        consent of the NRC. To request permission to reproduce the NPC, please contact:
                                                                                                           Production and Marketing Manager
                                                                                                           Codes Canada
                                                                                                           National Research Council of Canada
                                                                                                           1200 Montreal Road
                                                                                                           Ottawa, Ontario K1A 0R6
                                                                                                           E-mail: Codes@nrc-cnrc.gc.ca




                                                                                                    x                                                                              National Plumbing Code of Canada 2020
                                                                                                    Preface

                                                                                                    Contact Information
                                                                                                        The CCBFC welcomes comments and suggestions for improvements to the NPC. Persons
                                                                                                        interested in requesting a change to an NPC provision should refer to the guidelines available
                                                                                                        on the NRC's website.

                                                                                                        To submit comments or suggestions, please contact:
                                                                                                          The Secretary
                                                                                                          Canadian Commission on Building and Fire Codes
                                                                                                          1200 Montreal Road
                                                                                                          Ottawa, Ontario K1A 0R6




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                          E-mail: CCBFCSecretary-SecretaireCCCBPI@nrc-cnrc.gc.ca




                                                                                                    National Plumbing Code of Canada 2020                                                                xi
                                        Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays


xii




National Plumbing Code of Canada 2020
                                                                                                    Relationship of the NPC to Standards
                                                                                                    Development and Conformity
                                                                                                    Assessment
                                                                                                        The development of many provisions in the NPC and the assessment of conformity to those




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                        provisions are supported by several of the member organizations of Canada's National
                                                                                                        Standards System (NSS).

                                                                                                        The NSS is a network of accredited organizations concerned with standards development,
                                                                                                        certification, testing and inspection that is established under the auspices of the Standards
                                                                                                        Council of Canada Act. Activities of the NSS are coordinated by the Standards Council of
                                                                                                        Canada (SCC), which accredits standards development organizations, certification bodies,
                                                                                                        testing and calibration laboratories, and inspection bodies, among others.

                                                                                                        The SCC is a non-profit federal Crown corporation responsible for the coordination of
                                                                                                        voluntary standardization in Canada. It also coordinates Canadian participation in voluntary
                                                                                                        international standardization activities.


                                                                                                    Canadian Standards
                                                                                                        Many of the standards referenced in the NPC are published by standards development
                                                                                                        organizations accredited in Canada. As part of the accreditation requirements, these
                                                                                                        organizations adhere to the principle of consensus, which generally means substantial
                                                                                                        majority agreement of a committee comprising a balance of producer, user and general
                                                                                                        interest members, and the consideration of all negative comments. The standards
                                                                                                        development organizations also have formal procedures for the balloting and second-level
                                                                                                        review of standards prepared under their oversight.

                                                                                                        The following organizations are accredited as standards development organizations in
                                                                                                        Canada:
                                                                                                          • Air-Conditioning, Heating and Refrigeration Institute (AHRI)
                                                                                                          • ASTM International
                                                                                                          • Bureau de normalisation du Québec (BNQ)
                                                                                                          • Canadian General Standards Board (CGSB)
                                                                                                          • CSA Group
                                                                                                          • International Association of Plumbing and Mechanical Officials (IAPMO)
                                                                                                          • ULC Standards
                                                                                                          • Underwriters' Laboratories Inc. (UL)

                                                                                                        Table 1.3.1.2. of Division B lists the standards referenced in the NPC. Standards proposed to
                                                                                                        be referenced in the NPC are reviewed to ensure that their content is compatible with the
                                                                                                        Code. Thereafter, referenced standards are reviewed as needed during each Code cycle.
                                                                                                        Standards development organizations are asked to provide information on any changes in the
                                                                                                        status of their standards referenced in the NPC—withdrawals, amendments, new editions,
                                                                                                        etc. This information is passed on to the CCBFC, its standing committees, the provinces and
                                                                                                        territories, and interested stakeholders, all of whom are given the opportunity to identify
                                                                                                        any problems associated with the changes. These bodies do not necessarily review in detail
                                                                                                        the revised standards; rather, the approach relies on the consensus process involved in the
                                                                                                        maintenance of the standards and on the extensive knowledge and experience of committee
                                                                                                        members, provincial or territorial staff, NRC staff, and consulted stakeholders to identify
                                                                                                        changes in the standards that might create problems in the Code.




                                                                                                    National Plumbing Code of Canada 2020                                                               xiii
                                                                                                                                                                                                             Preface

                                                                                                    Non-Canadian Standards
                                                                                                          A number of subject areas for which the standards development organizations accredited in
                                                                                                          Canada have not developed standards are covered in the NPC. In these cases, the Code often
                                                                                                          references standards developed by organizations in other countries, such as the American
                                                                                                          Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) and the
                                                                                                          National Fire Protection Association (NFPA). These standards are developed using processes
                                                                                                          that may differ from those used by the standards development organizations accredited in
                                                                                                          Canada; nevertheless, the standards have been reviewed by the relevant standing committees
                                                                                                          and found to be acceptable.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    Conformity Assessment
                                                                                                          The NPC establishes minimum measures, which are set out within its own text or within
                                                                                                          referenced standards. However, the NPC does not set out who is responsible for assessing
                                                                                                          conformity to the measures or how those with this responsibility might carry it out. This
                                                                                                          responsibility is usually established by the governing legislation of the adopting provinces
                                                                                                          and territories. Provincial or territorial authorities should be consulted to determine who is
                                                                                                          responsible for conformity assessment within their jurisdiction.

                                                                                                          Those persons responsible for ensuring that materials, appliances, systems and equipment
                                                                                                          meet the requirements of this Code have several means available to assist them, ranging
                                                                                                          from on-site inspection to the use of certification services provided by accredited third-party
                                                                                                          organizations. Test reports or mill certificates provided by manufacturers or suppliers can
                                                                                                          also assist in the acceptance of products. Engineering reports may be required for more
                                                                                                          complex products.

                                                                                                          Testing
                                                                                                              The SCC accredits testing and calibration laboratories that are capable of reliably testing
                                                                                                              products to specified standards. The test results produced by these organizations can be
                                                                                                              used in the certification, evaluation and qualification of products for compliance with
                                                                                                              Code provisions. The SCC's website (www.scc.ca) lists accredited testing and calibration
                                                                                                              laboratories, along with their scope of accreditation.

                                                                                                          Certification
                                                                                                              Certification is the confirmation by an independent organization that a product, process,
                                                                                                              service or system meets a requirement. Certification may entail physical examination,
                                                                                                              testing as specified in appropriate standards, an initial plant inspection, and/or follow-up
                                                                                                              unannounced plant inspections. This procedure leads to the issuing of a formal assurance
                                                                                                              or declaration, by means of a certification mark or certificate, that the product, process,
                                                                                                              service or system is in full conformity with specified provisions.

                                                                                                              In some cases, a product for which no standard exists can be certified using procedures
                                                                                                              and criteria developed by an accredited certification body and specifically designed to
                                                                                                              measure the performance of that product.

                                                                                                              Certification bodies publish lists of certified products and companies. The SCC's website
                                                                                                              (www.scc.ca) lists accredited certification bodies, along with their scope of accreditation.
                                                                                                              Several organizations, including the Canadian Construction Materials Centre (CCMC) at
                                                                                                              the NRC, offer product certification services.

                                                                                                          Evaluation
                                                                                                              An evaluation is a written opinion by an independent professional organization that a
                                                                                                              product will perform its intended function. An evaluation is often done to determine the
                                                                                                              ability of an innovative product, for which no standards exist, to satisfy the intent of a
                                                                                                              Code requirement. Follow-up plant inspections are not normally part of the evaluation
                                                                                                              process.


                                                                                                    xiv                                                                              National Plumbing Code of Canada 2020
                                                                                                    Preface

                                                                                                        Qualification

                                                                                                            Qualification evaluates the ability of a product to perform its intended function by
                                                                                                            verifying that it meets the requirements of a standard. Qualification normally includes
                                                                                                            some follow-up plant inspection. Some organizations publish lists of qualified products
                                                                                                            that meet the specified requirements. Some organizations qualify product manufacturing
                                                                                                            and/or testing facilities for compliance with the Code and relevant standards.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




                                                                                                    National Plumbing Code of Canada 2020                                                             xv
                                        Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays



xvi




National Plumbing Code of Canada 2020
                                                                                                    Canadian Commission on Building and
                                                                                                    Fire Codes and Standing Committees

                                                                                                                        Canadian Commission on Building and Fire Codes




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    D. Crawford (Chair)           C. Gray                  T. Ross                        Codes Canada staff
                                                                                                    R. Arsenault                  H. Griffin               R. Rymell                      who provided assistance
                                                                                                    K. Block                      K. Griffiths             B. Sim                         to the Commission
                                                                                                    A. Borooah                    T. Harper                S. Stinson                     M. Dumoulin
                                                                                                    R. Brooks                     L. Holmen                D. Sullivan                    G. Gosselin
                                                                                                    J. Chauvin                    C. Joseph (1)            A. Tabet                       A. Gribbon
                                                                                                    M. Cianchetti                 K. Lee                   P. Thorkelsson                 P. Jago
                                                                                                    T. Cochren                    B. Lorne                 M. Tovey                       A. Laroche
                                                                                                    V. de Passillé                D. MacKinnon             C. Tye                         F. Lohmann
                                                                                                    R. Dulmage                    M. McSweeney             E. Whalen                      P. Rizcallah
                                                                                                    C. Fillingham                 G. Morinville            G. Yoshida                     R. Tremblay
                                                                                                    S. Garcia                     S. Ottens
                                                                                                    K. Gloge                      R. Richard




                                                                                                     Standing Committee on HVAC and                           Technical Translation Verification
                                                                                                                Plumbing                                                 Committee
                                                                                                    T. White (Chair)             R. Roberts                  G. Harvey (Chair)            Codes Canada staff
                                                                                                    H. Bouchard                  C. Roy                      F. Genest                    who provided assistance
                                                                                                    F. Di Folco                  A. Spurrell                 B. Lagueux                   to the Committee

                                                                                                    Y. Duchesne                  G. Stasynec                 N. Lessard                   I. Bastien
                                                                                                    L. Gill                      S. Steele                   I. Wagner                    M. Gingras
                                                                                                    R. Gill                      K. Wong                                                  K. Le Van
                                                                                                    X. Hao                                                                                G. Mougeot-Lemay
                                                                                                    E. Howard                    Codes Canada staff                                       S. Veilleux
                                                                                                    D. Hui                       who provided assistance
                                                                                                    D. Lima                      to the Committee           (1)   Resigned on September 23, 2016, due to employment
                                                                                                    S. Manning                   T. Achour                        opportunity with Codes Canada.
                                                                                                    R. Moulton                   D. Green
                                                                                                    E. Piecuch                   P. Tardif
                                                                                                    T. Pringle




                                                                                                    National Plumbing Code of Canada 2020                                                                           xvii
                                        Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays



xviii




National Plumbing Code of Canada 2020
Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




                                                             Compliance, Objectives and


                                                                                          Division A



                                                               Functional Statements
Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    Division A



                                                                                                    Part 1
                                                                                                    Compliance




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                      1.1.          General
                                                                                                      1.1.1.        Application of this Code .................. 1-1

                                                                                                      1.2.          Compliance
                                                                                                      1.2.1.        Compliance with this Code ............. 1-1
                                                                                                      1.2.2.        Materials, Systems and
                                                                                                                    Equipment ......................................... 1-1

                                                                                                      1.3.          Divisions A, B and C of
                                                                                                                    this Code
                                                                                                      1.3.1.        General .............................................. 1-2
                                                                                                      1.3.2.        Application of Division A ................. 1-2
                                                                                                      1.3.3.        Application of Division B ................. 1-2
                                                                                                      1.3.4.        Application of Division C ................. 1-2

                                                                                                      1.4.          Terms and Abbreviations
                                                                                                      1.4.1.        Definitions of Words and Phrases .. 1-2
                                                                                                      1.4.2.        Symbols and Other Abbreviations .. 1-8

                                                                                                      1.5.          Referenced Documents
                                                                                                                    and Organizations
                                                                                                      1.5.1.        Referenced Documents ................... 1-9
                                                                                                      1.5.2.        Organizations ................................... 1-9

                                                                                                                    Notes to Part 1 ................ 1-11




                                                                                                    National Plumbing Code of Canada 2020
                                        Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




National Plumbing Code of Canada 2020
                                                                                                    Division A



                                                                                                    Part 1
                                                                                                    Compliance




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    Section 1.1. General
                                                                                                    1.1.1.           Application of this Code
                                                                                                    1.1.1.1.         Application of this Code
                                                                                                                        1) This Code applies to the design, installation, extension, alteration, renewal or
                                                                                                                     repair of plumbing systems.
                                                                                                                        2) This Code specifies the minimum requirements for
                                                                                                                        a) drainage systems for water-borne wastes and storm water for buildings to the
                                                                                                                           point of connection with public services,
                                                                                                                        b) venting systems,
                                                                                                                        c) water service pipes, and
                                                                                                                        d) water distribution systems.
                                                                                                                       3) Plumbing facilities in buildings shall be provided in accordance with Part 7 of
                                                                                                                     Division B of the National Building Code of Canada 2020.


                                                                                                    Section 1.2. Compliance
                                                                                                    1.2.1.           Compliance with this Code
                                                                                                    1.2.1.1.         Compliance with this Code
                                                                                                                        1) Compliance with this Code shall be achieved by
                                                                                                                        a) complying with the applicable acceptable solutions in Division B (see
                                                                                                                           Note A-1.2.1.1.(1)(a)), or
                                                                                                                        b) using alternative solutions that will achieve at least the minimum level of
                                                                                                                           performance required by Division B in the areas defined by the objectives
                                                                                                                           and functional statements attributed to the applicable acceptable solutions
                                                                                                                           (see Note A-1.2.1.1.(1)(b)).
                                                                                                                        2) For the purposes of compliance with this Code as required in
                                                                                                                     Clause 1.2.1.1.(1)(b), the objectives and functional statements attributed to the
                                                                                                                     acceptable solutions in Division B shall be the objectives and functional statements
                                                                                                                     referred to in Subsection 1.1.2. of Division B.

                                                                                                    1.2.2.           Materials, Systems and Equipment
                                                                                                    1.2.2.1.         Characteristics of Materials, Systems and Equipment
                                                                                                                        1) All materials, systems and equipment installed to meet the requirements of
                                                                                                                     this Code shall be free of defects and possess the necessary characteristics to perform
                                                                                                                     their intended functions when installed.


                                                                                                    National Plumbing Code of Canada 2020                                                                 Division A 1-1
                                                                                                    1.2.2.2.                                                                                         Division A

                                                                                                    1.2.2.2.         Used Materials and Equipment
                                                                                                                        1) Used materials and equipment, including fixtures, shall not be reused unless
                                                                                                                     they meet the requirements of this Code for new materials and equipment and are
                                                                                                                     otherwise satisfactory for their intended use.


                                                                                                    Section 1.3. Divisions A, B and C of this Code
                                                                                                    1.3.1.           General




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    1.3.1.1.         Scope of Division A
                                                                                                                       1) Division A contains the compliance and application provisions, objectives
                                                                                                                     and functional statements of this Code.

                                                                                                    1.3.1.2.         Scope of Division B
                                                                                                                        1) Division B contains the acceptable solutions of this Code.

                                                                                                    1.3.1.3.         Scope of Division C
                                                                                                                        1) Division C contains the administrative provisions of this Code.

                                                                                                    1.3.1.4.         Internal Cross-references
                                                                                                                       1) Where the Division of a referenced provision is not specified in this Code, it shall
                                                                                                                     mean that the referenced provision is in the same Division as the referencing provision.

                                                                                                    1.3.2.           Application of Division A
                                                                                                    1.3.2.1.         Application of Parts 1, 2 and 3
                                                                                                                       1) Parts 1, 2 and 3 of Division A apply to all plumbing systems covered in this
                                                                                                                     Code. (See Article 1.1.1.1.)

                                                                                                    1.3.3.           Application of Division B
                                                                                                    1.3.3.1.         Application of Parts 1 and 2
                                                                                                                        1) Parts 1 and 2 of Division B apply to all plumbing systems covered in this Code.
                                                                                                                     (See Article 1.1.1.1.)

                                                                                                    1.3.4.           Application of Division C
                                                                                                    1.3.4.1.         Application of Parts 1 and 2
                                                                                                                        1) Parts 1 and 2 of Division C apply to all plumbing systems covered in this Code.
                                                                                                                     (See Article 1.1.1.1.)


                                                                                                    Section 1.4. Terms and Abbreviations
                                                                                                    1.4.1.           Definitions of Words and Phrases
                                                                                                    1.4.1.1.         Non-defined Terms
                                                                                                                        1) Words and phrases used in this Code that are not included in the list of
                                                                                                                     definitions in Article 1.4.1.2. shall have the meanings that are commonly assigned to
                                                                                                                     them in the context in which they are used, taking into account the specialized use of
                                                                                                                     terms by the various trades and professions to which the terminology applies.
                                                                                                                        2) Where objectives and functional statements are referred to in this Code, they
                                                                                                                     shall be the objectives and functional statements described in Parts 2 and 3.


                                                                                                    1-2 Division A                                                                 National Plumbing Code of Canada 2020
                                                                                                    Division A                                                                                                    1.4.1.2.

                                                                                                                        3) Where acceptable solutions are referred to in this Code, they shall be the
                                                                                                                     provisions stated in Part 2 of Division B.
                                                                                                                        4) Where alternative solutions are referred to in this Code, they shall be the
                                                                                                                     alternative solutions mentioned in Clause 1.2.1.1.(1)(b).

                                                                                                    1.4.1.2.         Defined Terms
                                                                                                                        1) The words and terms in italics in this Code shall have the following meanings
                                                                                                                     (an asterisk (*) following a defined word or term indicates that the definition for that
                                                                                                                     word or term is taken from the NBC):
                                                                                                                     Additional circuit vent means a vent pipe that is installed between a circuit vent and a relief




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                       vent to provide additional air circulation.
                                                                                                                     Air admittance valve means a one-way valve designed to allow air to enter the drainage
                                                                                                                        system when the pressure in the plumbing system is less than the atmospheric
                                                                                                                        pressure. (See Note A-2.2.10.16.(1) of Division B.)
                                                                                                                     Air break means the unobstructed vertical distance between the lowest point of an
                                                                                                                        indirectly connected sanitary drainage pipe and the flood level rim of the fixture into
                                                                                                                        which it discharges. (See Note A-2.3.3.11.(2) of Division B.)
                                                                                                                     Air gap means the unobstructed vertical distance through air between the lowest point
                                                                                                                        of a water supply outlet and the flood level rim of the fixture or device into which the
                                                                                                                        outlet discharges. (See Note A-2.6.2.9.(2) of Division B.)
                                                                                                                     Alloyed zinc means an alloy of zinc having the corrosion resistance and physical
                                                                                                                        properties of an alloy containing 0.15% titanium, 0.74% copper and 99.11% zinc,
                                                                                                                        and so tempered as to be capable of being formed into the shape required for
                                                                                                                        a watertight joint.
                                                                                                                     Auxiliary water supply means any water supply on or available to the premises other
                                                                                                                       than the primary potable water supply. (See Note A-1.4.1.2.(1).)
                                                                                                                     Backflow means a flowing back or reversal of the normal direction of the flow.
                                                                                                                     Backflow preventer means a device or a method that prevents backflow. (See
                                                                                                                       Figure A-1.4.1.2.(1)-A in Note A-1.4.1.2.(1).)
                                                                                                                     Back pressure means pressure higher than the supply pressure.
                                                                                                                     Back-siphonage means backflow caused by a negative pressure in the supply system. (See
                                                                                                                       Figure A-1.4.1.2.(1)-B in Note A-1.4.1.2.(1).)
                                                                                                                     Back-siphonage preventer (or vacuum breaker) means a device or a method that prevents
                                                                                                                       back-siphonage. (See Figure A-1.4.1.2.(1)-C in Note A-1.4.1.2.(1).)
                                                                                                                     Backwater valve means a check valve designed for use in a gravity drainage system.
                                                                                                                     Bathroom group means a group of plumbing fixtures installed in the same room,
                                                                                                                       consisting of one domestic-type lavatory, one water closet and either one bathtub
                                                                                                                       (with or without a shower) or one one-head shower.
                                                                                                                     Branch means a sanitary drainage pipe connected at its upstream end to the junction of 2
                                                                                                                       or more sanitary drainage pipes or to a stack, and connected at its downstream end
                                                                                                                       to another branch, a sump, a stack or a building drain. (See Figure A-1.4.1.2.(1)-F in
                                                                                                                       Note A-1.4.1.2.(1).)
                                                                                                                     Branch vent means a vent pipe that is connected at its lower end to the junction of 2 or
                                                                                                                       more vent pipes, and at its upper end, either to another branch vent or to a stack vent,
                                                                                                                       vent stack or vent header, or terminates in open air. (See Figure A-1.4.1.2.(1)-D in
                                                                                                                       Note A-1.4.1.2.(1).)
                                                                                                                     Building* means any structure used or intended for supporting or sheltering any use
                                                                                                                       or occupancy.
                                                                                                                     Building drain means the lowest horizontal piping, including any vertical offset, that
                                                                                                                       conducts sewage, clear-water waste or storm water by gravity to a building sewer. (See
                                                                                                                       Figure A-1.4.1.2.(1)-F in Note A-1.4.1.2.(1).)
                                                                                                                     Building sewer means a pipe that is connected to a building drain 1 m outside a wall of a
                                                                                                                       building and that leads to a public sewer or private sewage disposal system.


                                                                                                    National Plumbing Code of Canada 2020                                                                         Division A 1-3
                                                                                                    1.4.1.2.                                                                                              Division A

                                                                                                                     Building trap means a trap that is installed in a building drain or building sewer to
                                                                                                                       prevent the circulation of air between a drainage system and a public sewer. (See
                                                                                                                       Note A-2.4.5.4.(1) of Division B.)
                                                                                                                     Care or detention occupancy means the occupancy or use of a building or part thereof
                                                                                                                       by persons who require special care or treatment because of cognitive or
                                                                                                                       physical limitations or by persons who are restrained from, or are incapable of,
                                                                                                                       self-preservation because of security measures not under their control.
                                                                                                                     Check valve means a valve that permits flow in one direction but prevents a return flow.
                                                                                                                     Circuit vent means a vent pipe that serves a number of fixtures and connects to the fixture
                                                                                                                        drain of the most upstream fixture.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                     Class 1 fire sprinkler/standpipe system means an assembly of pipes and fittings that
                                                                                                                        conveys water from the water service pipe to the sprinkler/standpipe system's
                                                                                                                        outlets, is directly connected to the public water supply main only, has no pumps or
                                                                                                                        reservoirs, and in which the sprinkler drains discharge to the atmosphere, to dry
                                                                                                                        wells or to other safe outlets.
                                                                                                                     Class 2 fire sprinkler/standpipe system means a Class 1 fire sprinkler/standpipe system that
                                                                                                                        includes a booster pump in its connection to the public water supply main.
                                                                                                                     Class 3 fire sprinkler/standpipe system means an assembly of pipes and fittings that
                                                                                                                        conveys water from the water service pipe to the sprinkler/standpipe system's outlets
                                                                                                                        and is directly connected to the public water supply main as well as to one or more
                                                                                                                        of the following storage facilities, which are filled from the public water supply
                                                                                                                        main only: elevated water storage, fire pumps supplying water from aboveground
                                                                                                                        covered reservoirs, or pressure tanks. The water in this sprinkler/standpipe system
                                                                                                                        must be maintained in potable condition. (See Note A-1.4.1.2.(1).)
                                                                                                                     Class 4 fire sprinkler/standpipe system means an assembly of pipes and fittings that
                                                                                                                        conveys water from the water service pipe to the sprinkler/standpipe system's outlets
                                                                                                                        and is directly connected to the public water supply main (similar to Class 1 and
                                                                                                                        Class 2 fire sprinkler/standpipe systems) and to an auxiliary water supply dedicated to
                                                                                                                        fire department use that is located within 520 m of a pumper connection.
                                                                                                                     Class 5 fire sprinkler/standpipe system means an assembly of pipes and fittings that
                                                                                                                        conveys water from the water service pipe to the sprinkler/standpipe system's outlets
                                                                                                                        and is directly connected to the public water supply main and also interconnected
                                                                                                                        with an auxiliary water supply.
                                                                                                                     Class 6 fire sprinkler/standpipe system means an assembly of pipes and fittings that
                                                                                                                        conveys water from the water service pipe to the sprinkler/standpipe system's outlets
                                                                                                                        and acts as a combined industrial water supply and fire protection system supplied
                                                                                                                        from the public water supply main only, with or without gravity storage or pump
                                                                                                                        suction tanks.
                                                                                                                     Cleanout means an access provided in drainage and venting systems to provide for
                                                                                                                        cleaning and inspection services.
                                                                                                                     Clear-water waste means waste water with impurity levels that will not be harmful to
                                                                                                                        health and may include cooling water and condensate drainage from refrigeration
                                                                                                                        and air-conditioning equipment and cooled condensate from steam heating systems,
                                                                                                                        but does not include storm water. (See Note A-1.4.1.2.(1).)
                                                                                                                     Combined building drain means a building drain that is intended to conduct sewage and
                                                                                                                       storm water.
                                                                                                                     Combined building sewer means a building sewer that is intended to conduct sewage and
                                                                                                                       storm water.
                                                                                                                     Combined sewer means a sewer that is intended to conduct sewage and storm water.
                                                                                                                     Combustible* means that a material fails to meet the acceptance criteria
                                                                                                                       of CAN/ULC-S114, “Standard Method of Test for Determination of
                                                                                                                       Non-Combustibility in Building Materials.”
                                                                                                                     Continuous vent means a vent pipe that is an extension of a vertical section of a branch or
                                                                                                                       fixture drain. (See Figure A-1.4.1.2.(1)-E in Note A-1.4.1.2.(1).)


                                                                                                    1-4 Division A                                                                     National Plumbing Code of Canada 2020
                                                                                                    Division A                                                                                                  1.4.1.2.

                                                                                                                     Critical level means the level of submergence at which the back-siphonage preventer
                                                                                                                        ceases to prevent back-siphonage.
                                                                                                                     Dead end means a pipe that terminates with a closed fitting.
                                                                                                                     Developed length means the length along the centre line of the pipe and fittings. (See
                                                                                                                       Note A-2.5.6.3.(1) of Division B.)
                                                                                                                     Directly connected means physically connected in such a way that water or gas cannot
                                                                                                                       escape from the connection.
                                                                                                                     Drainage system means an assembly of pipes, fittings, fixtures, traps and appurtenances
                                                                                                                       that is used to convey sewage, clear-water waste or storm water to a public sewer or
                                                                                                                       a private sewage disposal system, but does not include subsoil drainage pipes. (See




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                       Figure A-1.4.1.2.(1)-F in Note A-1.4.1.2.(1).)
                                                                                                                     Dual vent means a vent pipe that serves 2 fixtures and connects at the junction of the trap
                                                                                                                       arms. (See Figure A-1.4.1.2.(1)-G in Note A-1.4.1.2.(1).)
                                                                                                                     Dwelling unit* means a suite operated as a housekeeping unit, used or intended to
                                                                                                                       be used by one or more persons and usually containing cooking, eating, living,
                                                                                                                       sleeping and sanitary facilities.
                                                                                                                     Emergency floor drain means a fixture for the purposes of overflow protection that does
                                                                                                                       not receive regular discharge from other fixtures, other than from a trap primer.
                                                                                                                       (See Note A-1.4.1.2.(1).)
                                                                                                                     Fire separation* means a construction assembly that acts as a barrier against the spread
                                                                                                                        of fire.
                                                                                                                     Fire service pipe means a pipe that conveys water from a public water main or private
                                                                                                                        water source to the inside of a building for the purpose of supplying the fire sprinkler
                                                                                                                        or standpipe systems.
                                                                                                                     Fixture means a receptacle, appliance, apparatus or other device that discharges sewage
                                                                                                                        or clear-water waste, and includes a floor drain.
                                                                                                                     Fixture drain means the pipe that connects a trap serving a fixture to another part of
                                                                                                                        a drainage system.
                                                                                                                     Fixture outlet pipe means a pipe that connects the waste opening of a fixture to the trap
                                                                                                                        serving the fixture. (See Figure A-1.4.1.2.(1)-H in Note A-1.4.1.2.(1).)
                                                                                                                     Fixture unit (as applying to drainage systems) means the unit of measure based on the
                                                                                                                        rate of discharge, time of operation and frequency of use of a fixture that expresses
                                                                                                                        the hydraulic load that is imposed by that fixture on the drainage system.
                                                                                                                     Fixture unit (as applying to water distribution systems) means the unit of measure based
                                                                                                                        on the rate of supply, time of operation and frequency of use of a fixture or outlet
                                                                                                                        that expresses the hydraulic load that is imposed by that fixture or outlet on the
                                                                                                                        supply system.
                                                                                                                     Flood level rim means the top edge at which water can overflow from a fixture or device.
                                                                                                                        (See Figure A-1.4.1.2.(1)-B in Note A-1.4.1.2.(1).)
                                                                                                                     Flow control roof drain means a roof drain that restricts the flow of storm water into the
                                                                                                                        storm drainage system.
                                                                                                                     Fresh air inlet means a vent pipe that is installed in conjunction with a building trap and
                                                                                                                        terminates outdoors. (See Note A-2.4.5.4.(1) of Division B.)
                                                                                                                     Indirectly connected means not directly connected. (See Note A-2.3.3.11.(2) of Division B.)
                                                                                                                     Indirect service water heater* means a service water heater that derives its heat from a
                                                                                                                        heating medium such as warm air, steam or hot water.
                                                                                                                     Individual vent means a vent pipe that serves one fixture.
                                                                                                                     Interceptor means a receptacle that is installed to prevent oil, grease, sand or other
                                                                                                                        materials from passing into a drainage system.
                                                                                                                     Leader means a pipe that is installed to carry storm water from a roof to a storm building
                                                                                                                        drain or sewer or other place of disposal.
                                                                                                                     Nominally horizontal means at an angle of less than 45° with the horizontal. (See
                                                                                                                       Figure A-1.4.1.2.(1)-J in Note A-1.4.1.2.(1).)


                                                                                                    National Plumbing Code of Canada 2020                                                                       Division A 1-5
                                                                                                    1.4.1.2.                                                                                            Division A

                                                                                                                     Nominally vertical means at an angle of not more than 45° with the vertical. (See
                                                                                                                       Figure A-1.4.1.2.(1)-J in Note A-1.4.1.2.(1).)
                                                                                                                     Nominal pipe size (NPS) means the nominal diameter by which a pipe, fitting, trap or
                                                                                                                       other similar item is commercially designated.
                                                                                                                     Noncombustible* means that a material meets the acceptance criteria of CAN/ULC-S114,
                                                                                                                       “Standard Method of Test for Determination of Non-Combustibility in Building
                                                                                                                       Materials.”
                                                                                                                     Occupancy* means the use or intended use of a building or part thereof for the shelter or
                                                                                                                       support of persons, animals or property.
                                                                                                                     Offset means the piping that connects the ends of 2 pipes that are parallel. (See




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                        Figure A-1.4.1.2.(1)-K in Note A-1.4.1.2.(1).)
                                                                                                                     Offset relief vent means a relief vent that provides additional air circulation upstream and
                                                                                                                        downstream of an offset in a stack. (See Note A-2.5.4.4.(1) of Division B.)
                                                                                                                     Plumbing system* means a drainage system, a venting system and a water system or parts
                                                                                                                        thereof. (See Figure A-1.4.1.2.(1)-L in Note A-1.4.1.2.(1).)
                                                                                                                     Potable means safe for human consumption.
                                                                                                                     Private sewage disposal system* means a privately owned plant for the treatment and
                                                                                                                        disposal of sewage (such as a septic tank with an absorption field).
                                                                                                                     Private use (as applying to the classification of plumbing fixtures) means fixtures
                                                                                                                        in residences and apartments, in private bathrooms of hotels, and in similar
                                                                                                                        installations in other buildings for one family or an individual.
                                                                                                                     Private water supply system means an assembly of pipes, fittings, valves, equipment and
                                                                                                                        appurtenances that supplies water from a private source to a water distribution system.
                                                                                                                     Public use (as applying to the classification of plumbing fixtures) means fixtures in
                                                                                                                       general washrooms of schools, gymnasiums, hotels, bars, public comfort stations
                                                                                                                       and other installations where fixtures are installed so that their use is unrestricted.
                                                                                                                     Relief vent means a vent pipe that is used in conjunction with a circuit vent to provide
                                                                                                                        additional air circulation between a drainage system and a venting system.
                                                                                                                     Residential full flow-through fire sprinkler/standpipe system means an assembly of pipes
                                                                                                                       and fittings installed in a one- or two-family dwelling that conveys water from the
                                                                                                                       water service pipe to the sprinkler/standpipe system's outlets and is fully integrated
                                                                                                                       into the potable water system to ensure a regular flow of water through all parts of
                                                                                                                       both systems.
                                                                                                                     Residential partial flow-through fire sprinkler/standpipe system means an assembly of pipes
                                                                                                                       and fittings installed in a one- or two-family dwelling that conveys water from the
                                                                                                                       water service pipe to the sprinkler/standpipe system's outlets and in which flow,
                                                                                                                       during inactive periods of the sprinkler/standpipe system, occurs only through the
                                                                                                                       main header to the water closet located at the farthest point of the two systems.
                                                                                                                     Riser means a water distribution pipe that extends through at least one full storey.
                                                                                                                     Roof drain means a fitting or device that is installed in the roof to permit storm water to
                                                                                                                       discharge into a leader.
                                                                                                                     Roof gutter means an exterior channel installed at the base of a sloped roof to convey
                                                                                                                       storm water.
                                                                                                                     Sanitary building drain means a building drain that conducts sewage to a building sewer
                                                                                                                       from the most upstream stack, branch or fixture drain serving a water closet.
                                                                                                                     Sanitary building sewer means a building sewer that conducts sewage.
                                                                                                                     Sanitary drainage pipe means a pipe in a sanitary drainage system.
                                                                                                                     Sanitary drainage system* means a drainage system that conducts sewage.
                                                                                                                     Sanitary sewer means a sewer that conducts sewage.
                                                                                                                     Service water heater* means a device for heating water for plumbing services.
                                                                                                                     Sewage means any liquid waste other than clear-water waste or storm water.


                                                                                                    1-6 Division A                                                                   National Plumbing Code of Canada 2020
                                                                                                    Division A                                                                                                1.4.1.2.

                                                                                                                     Stack means a vertical sanitary drainage pipe that passes through one or more storeys,
                                                                                                                        and includes any offset that is part of the stack.
                                                                                                                     Stack vent means a vent pipe that connects the top of a stack to a vent header or to outside
                                                                                                                        air. (See Figure A-1.4.1.2.(1)-G in Note A-1.4.1.2.(1).)
                                                                                                                     Storage-type service water heater* means a service water heater with an integral hot water
                                                                                                                        storage tank.
                                                                                                                     Storey for the purposes of this Code, means the interval between 2 successive floor
                                                                                                                        levels, including mezzanine floors that contain plumbing fixtures, or between a
                                                                                                                        floor level and roof.
                                                                                                                     Storm building drain means a building drain that conducts storm water and is connected at




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                        its upstream end to a leader, sump or catch basin, and at its downstream end to a
                                                                                                                        building sewer or a designated storm water disposal location.
                                                                                                                     Storm building sewer means a building sewer that conveys storm water.
                                                                                                                     Storm drainage system means a drainage system that conveys storm water.
                                                                                                                     Storm sewer means a sewer that conveys storm water.
                                                                                                                     Storm water means water that is discharged from a surface as a result of rainfall or
                                                                                                                        snowfall.
                                                                                                                     Subsoil drainage pipe means a pipe that is installed underground to intercept and convey
                                                                                                                       subsurface water.
                                                                                                                     Suite* means a single room or series of rooms of complementary use, operated under a
                                                                                                                       single tenancy, and includes dwelling units, individual guest rooms in motels, hotels,
                                                                                                                       boarding houses, rooming houses and dormitories as well as individual stores and
                                                                                                                       individual or complementary rooms for business and personal services occupancies.
                                                                                                                     Trap means a fitting or device that is designed to hold a liquid seal that will prevent the
                                                                                                                        passage of gas but will not materially affect the flow of a liquid.
                                                                                                                     Trap arm means that portion of a fixture drain between the trap weir and the vent pipe
                                                                                                                        fitting. (See Note A-2.5.6.3.(1) of Division B.)
                                                                                                                     Trap dip means the lowest part of the upper interior surface of a trap.
                                                                                                                     Trap seal depth means the vertical distance between the trap dip and the trap weir. (See
                                                                                                                        Note A-2.2.3.1.(1) and (3) of Division B.)
                                                                                                                     Trap standard means the trap for a fixture that is integral with the support for the fixture.
                                                                                                                     Trap weir means the highest part of the lower interior surface of a trap. (See
                                                                                                                        Note A-2.2.3.1.(1) and (3) of Division B.)
                                                                                                                     Vacuum breaker (see back-siphonage preventer).
                                                                                                                     Vent header means a vent pipe that connects any combination of stack vents or vent stacks
                                                                                                                       to outside air. (See Figure A-1.4.1.2.(1)-I in Note A-1.4.1.2.(1).)
                                                                                                                     Venting system means an assembly of pipes and fittings that connects a drainage system
                                                                                                                       with outside air for circulation of air and the protection of trap seals in the drainage
                                                                                                                       system. (See Figures A-1.4.1.2.(1)-F and A-1.4.1.2.(1)-G in Note A-1.4.1.2.(1).)
                                                                                                                     Vent pipe means a pipe that is part of a venting system.
                                                                                                                     Vent stack means a vent pipe that is connected at its upper end to a vent header or
                                                                                                                       that terminates in outside air and is connected at its lower end to the stack at or
                                                                                                                       below the lowest sanitary drainage pipe connection. (See Figure A-1.4.1.2.(1)-G in
                                                                                                                       Note A-1.4.1.2.(1).)
                                                                                                                     Water distribution system means an assembly of pipes, fittings, valves and appurtenances
                                                                                                                       that conveys water from the water service pipe or private water supply system to water
                                                                                                                       supply outlets, fixtures, appliances and devices.
                                                                                                                     Water service pipe means a pipe that conveys water from a public water main or private
                                                                                                                       water source to the inside of the building.
                                                                                                                     Water system means a private water supply system, a water service pipe, a water distribution
                                                                                                                       system or parts thereof.


                                                                                                    National Plumbing Code of Canada 2020                                                                    Division A 1-7
                                                                                                    1.4.2.1.                                                                                           Division A

                                                                                                                     Wet vent means a sanitary drainage pipe that also serves as a vent pipe and extends from
                                                                                                                       the most downstream wet-vented fixture connection to the most upstream fixture
                                                                                                                       connection. (See Note A-2.5.8.1.(2) of Division B.)
                                                                                                                     Yoke vent means a vent pipe that is connected at its lower end to a stack and at its upper
                                                                                                                       end to a vent stack or to a branch vent connected to a vent stack. (See Note A-2.5.4.3. of
                                                                                                                       Division B.)

                                                                                                    1.4.2.           Symbols and Other Abbreviations

                                                                                                    1.4.2.1.         Symbols and Other Abbreviations




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                        1) The symbols and other abbreviations in this Code shall have the meanings
                                                                                                                     assigned to them in this Article and in Article 1.3.2.1. of Division B.
                                                                                                                      ABS .............. acrylonitrile-butadiene-styrene
                                                                                                                      AL ................ aluminum
                                                                                                                      cm2 ............... square centimetre(s)
                                                                                                                      CPVC ........... chlorinated polyvinyl chloride
                                                                                                                      ° .................... degree(s)
                                                                                                                      °C ................. degree(s) Celsius
                                                                                                                      diam. ............ diameter
                                                                                                                      DWV ............ drain, waste and vent
                                                                                                                      h .................... hour(s)
                                                                                                                      in. ................. inch(es)
                                                                                                                      kg/m3 ........... kilogram(s) per cubic metre
                                                                                                                      kPa ............... kilopascal(s)
                                                                                                                      L ................... litre(s)
                                                                                                                      Lpf ................ litre(s) per flush
                                                                                                                      L/s ................ litre(s) per second
                                                                                                                      m .................. metre(s)
                                                                                                                      m2 ................. square metre(s)
                                                                                                                      max. ............. maximum
                                                                                                                      min. .............. minimum
                                                                                                                      min ............... minute(s)
                                                                                                                      mm ............... millimetre(s)
                                                                                                                      n/a ................ not applicable
                                                                                                                      No. ............... number(s)
                                                                                                                      PE ................. polyethylene
                                                                                                                      PE-RT ........... polyethylene of raised temperature
                                                                                                                      PEX .............. crosslinked polyethylene
                                                                                                                      PP-R ............. polypropylene
                                                                                                                      PVC .............. polyvinyl chloride
                                                                                                                      1 in 50 .......... slope of 1 vertical to 50 horizontal


                                                                                                    1-8 Division A                                                                   National Plumbing Code of Canada 2020
                                                                                                    Division A                                                                                         1.5.2.1.

                                                                                                    Section 1.5. Referenced Documents and
                                                                                                    Organizations
                                                                                                    1.5.1.           Referenced Documents

                                                                                                    1.5.1.1.         Application of Referenced Documents

                                                                                                                         1) Except as provided in Sentence (2), the provisions of documents referenced in
                                                                                                                     this Code, and of any documents referenced within those documents, apply only
                                                                                                                     to the extent that they relate to




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                         a) plumbing systems, and
                                                                                                                         b) the objectives and functional statements attributed to the applicable
                                                                                                                             acceptable solutions in Division B where the documents are referenced.
                                                                                                                     (See Note A-1.5.1.1.(1).)

                                                                                                                        2) Where a provision of this Code references another National Model Code, the
                                                                                                                     applicable objectives and functional statements shall include those found in that
                                                                                                                     referenced National Model Code.

                                                                                                    1.5.1.2.         Conflicting Requirements

                                                                                                                       1) In case of conflict between the provisions of this Code and those of a referenced
                                                                                                                     document, the provisions of this Code shall govern.

                                                                                                    1.5.1.3.         Applicable Editions

                                                                                                                        1) Where documents are referenced in this Code, they shall be the editions
                                                                                                                     designated in Subsection 1.3.1. of Division B.

                                                                                                    1.5.2.           Organizations

                                                                                                    1.5.2.1.         Abbreviations of Proper Names

                                                                                                                        1) The abbreviations of proper names in this Code shall have the meanings
                                                                                                                     assigned to them in Article 1.3.2.1. of Division B.




                                                                                                    National Plumbing Code of Canada 2020                                                             Division A 1-9
                                        Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




1-10 Division A




National Plumbing Code of Canada 2020
                                                                                                    Division A



                                                                                                    Notes to Part 1
                                                                                                    Compliance




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    A-1.2.1.1.(1)(a) Code Compliance via Acceptable Solutions. If a plumbing system design (e.g.,
                                                                                                    material, component, assembly or system) can be shown to meet all provisions of the applicable acceptable
                                                                                                    solutions in Division B (e.g., it complies with the applicable provisions of a referenced standard), it is deemed to
                                                                                                    have satisfied the objectives and functional statements linked to those provisions and thus to have complied
                                                                                                    with that part of the Code. In fact, if it can be determined that a design meets all the applicable acceptable
                                                                                                    solutions in Division B, there is no need to consult the objectives and functional statements in Division A to
                                                                                                    determine its compliance.

                                                                                                    A-1.2.1.1.(1)(b) Code Compliance via Alternative Solutions. Where a design differs from the
                                                                                                    acceptable solutions in Division B, then it should be treated as an “alternative solution.” A proponent of an
                                                                                                    alternative solution must demonstrate that the alternative solution addresses the same issues as the applicable
                                                                                                    acceptable solutions in Division B and their attributed objectives and functional statements. However, because
                                                                                                    the objectives and functional statements are entirely qualitative, demonstrating compliance with them in
                                                                                                    isolation is not possible. Therefore, Clause 1.2.1.1.(1)(b) identifies the principle that Division B establishes the
                                                                                                    quantitative performance targets that alternative solutions must meet. In many cases, these targets are not
                                                                                                    defined very precisely by the acceptable solutions—certainly far less precisely than would be the case with
                                                                                                    a true performance code, which would have quantitative performance targets and prescribed methods of
                                                                                                    performance measurement for all aspects of building performance. Nevertheless, Clause 1.2.1.1.(1)(b) makes it
                                                                                                    clear that an effort must be made to demonstrate that an alternative solution will perform as well as a design
                                                                                                    that would satisfy the applicable acceptable solutions in Division B—not “well enough” but “as well as.”
                                                                                                    In this sense, it is Division B that defines the boundaries between acceptable risks and the “unacceptable” risks
                                                                                                    referred to in the statements of the Code's objectives, i.e., the risk remaining once the applicable acceptable
                                                                                                    solutions in Division B have been implemented represents the residual level of risk deemed to be acceptable by
                                                                                                    the broad base of Canadians who have taken part in the consensus process used to develop the Code.

                                                                                                         Level of Performance
                                                                                                         Where Division B offers a choice between several possible designs, it is likely that these designs may
                                                                                                         not all provide exactly the same level of performance. Among a number of possible designs satisfying
                                                                                                         acceptable solutions in Division B, the design providing the lowest level of performance should generally
                                                                                                         be considered to establish the minimum acceptable level of performance to be used in evaluating alternative
                                                                                                         solutions for compliance with the Code.
                                                                                                         Sometimes a single design will be used as an alternative solution to several sets of acceptable solutions
                                                                                                         in Division B. In this case, the level of performance required of the alternative solution should be at least
                                                                                                         equivalent to the overall level of performance established by all the applicable sets of acceptable solutions
                                                                                                         taken as a whole.
                                                                                                         Each provision in Division B has been analyzed to determine what it is intended to achieve. The resultant
                                                                                                         intent statements clarify what undesirable results each provision seeks to preclude. These statements
                                                                                                         are not a legal component of the Code, but are advisory in nature, and can help Code users establish

                                                                                                    These Notes are included for explanatory purposes only and do not form part of the requirements. The number
                                                                                                    that introduces each Note corresponds to the applicable requirement in this Part.
                                                                                                    The figures are schematic only; they depict various parts of the plumbing system but do not include details. For an
                                                                                                    explanation of the symbols and abbreviations used in the figures, refer to the list provided at the end of the Code.




                                                                                                    National Plumbing Code of Canada 2020                                                                                  Division A 1-11
                                                                                                    A-1.4.1.2.(1)                                                                                     Division A

                                                                                                        performance targets for alternative solutions. They are published as a separate electronic document entitled
                                                                                                        “Supplement to the NPC 2020: Intent Statements,” which is available on the NRC's website.

                                                                                                        Areas of Performance
                                                                                                        A subset of the acceptable solutions in Division B may establish criteria for particular types of designs (e.g.,
                                                                                                        certain types of materials, components, assemblies, or systems). Often such subsets of acceptable solutions
                                                                                                        are all attributed to the same objective: OH2, Sanitation, for example. In some cases, the designs that are
                                                                                                        normally used to satisfy this subset of acceptable solutions might also provide some benefits that could be
                                                                                                        related to some other objective: OP5, Protection of the Building or Facility from Water and Sewage Damage,
                                                                                                        for example. However, if none of the applicable acceptable solutions are linked to Objective OP5, it is not
                                                                                                        necessary that alternative solutions proposed to replace these acceptable solutions provide a similar benefit




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                        related to Protection of the Building or Facility from Water and Sewage Damage. In other words, the
                                                                                                        acceptable solutions in Division B establish acceptable levels of performance for compliance with the Code
                                                                                                        only in those areas defined by the objectives and functional statements attributed to the acceptable solutions.

                                                                                                        Applicable Acceptable Solutions
                                                                                                        In demonstrating that an alternative solution will perform as well as a design that would satisfy the
                                                                                                        applicable acceptable solutions in Division B, its evaluation should not be limited to comparison with the
                                                                                                        acceptable solutions to which an alternative is proposed. It is possible that acceptable solutions elsewhere
                                                                                                        in the Code also apply. The proposed alternative solution may be shown to perform as well as the most
                                                                                                        apparent acceptable solution, which it is replacing, but may not perform as well as other relevant acceptable
                                                                                                        solutions. For example, an innovative piping material may perform adequately in a drainage system, but
                                                                                                        may not meet combustibility requirements elsewhere in the Code. All applicable acceptable solutions
                                                                                                        should be taken into consideration in demonstrating the compliance of an alternative solution.

                                                                                                    A-1.4.1.2.(1)     Defined Terms.

                                                                                                        Auxiliary Water Supply
                                                                                                        The auxiliary water supply may include water from a secondary potable water supply or from any natural
                                                                                                        source, such as a well, lake, spring, stream or harbour. It may also include waste water (but not sanitary
                                                                                                        drainage) from industrial processes, such as cooling towers, or from storm retention ponds. These sources
                                                                                                        may be polluted or contaminated and constitute an unacceptable water source over which the primary
                                                                                                        water purveyor does not have sanitary control. It is generally accepted that there are two categories of
                                                                                                        auxiliary water supply:
                                                                                                         (a) any public potable water supply over which the primary water purveyor does not have sanitary
                                                                                                              control, or
                                                                                                         (b) any private water supply, other than the primary potable water supply, that is on or available to the
                                                                                                              premises.

                                                                                                        Class 3 Fire Sprinkler/Standpipe Systems
                                                                                                        In Class 3 fire sprinkler/standpipe systems, water is supplied to the storage facilities from the public water
                                                                                                        supply and is maintained in potable condition. Class 3 fire sprinkler/standpipe systems resemble Class 1
                                                                                                        fire sprinkler/standpipe systems in all other respects.

                                                                                                        Clear-Water Waste
                                                                                                        Examples of clear-water waste are the waste waters discharged from a drinking fountain, cooling jacket, air
                                                                                                        conditioner or relief valve outlet.

                                                                                                        Emergency Floor Drains
                                                                                                        There are two types of floor drains. One is an emergency floor drain installed to avoid flooding in a
                                                                                                        building from any pipe or fixture failure. The other encompasses floor drains installed to receive discharge
                                                                                                        from specific pieces of equipment; this type is defined as a fixture.




                                                                                                    1-12 Division A                                                                 National Plumbing Code of Canada 2020
                                                                                                    Division A                                                                                   A-1.4.1.2.(1)

                                                                                                        Illustrations for Defined Terms




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                Normal flow conditions




                                                                                                                                                                            leakage port



                                                                                                                                                Backflow conditions

                                                                                                                                      (a) Reduced pressure principle backflow
                                                                                                                                          preventer assembly


                                                                                                                                      inlet
                                                                                                                                      water supply pipe
                                                                                                                                      valve
                                                                                                                                      check valve
                                                                                                                                      differential relief valve
                                                                                                                                      leakage port
                                                                                                                                      check valve
                                                                                                                                      valve

                                                                                                                                      (b) Assembly of differential valves and
                                                                                                                                          check valves used as a backflow preventer
                                                                                                                                                                                      EG01117A


                                                                                                          Figure A-1.4.1.2.(1)-A
                                                                                                          Backflow preventer




                                                                                                    National Plumbing Code of Canada 2020                                                            Division A 1-13
                                                                                                    A-1.4.1.2.(1)                                                                                                                     Division A

                                                                                                                                                                               flood level rim

                                                                                                                                                                              flush valve water closet




                                                                                                                                                                               flood level rim

                                                                                                                                                                               bathtub




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                              flood level rim

                                                                                                                                                                              sink or lavatory




                                                                                                                                                                                                    EG01118A


                                                                                                          Figure A-1.4.1.2.(1)-B
                                                                                                          Back-siphonage
                                                                                                          Notes to Figure A-1.4.1.2.(1)-B:
                                                                                                          (1) Figure A-1.4.1.2.(1)-B shows a situation that is fairly common in old buildings. If the bathtub is filled to a level above the faucet outlet,
                                                                                                              or if the flush valve of the water closet is faulty, and if the faucet at the sink or lavatory on the lower floor is opened, water can
                                                                                                              be drawn (siphoned) from the bathtub or the water closet into the water system when the pressure in the water system is low or
                                                                                                              the water supply has been shut off.
                                                                                                          (2) Back-siphonage can be prevented in the above situations by providing an air gap or a back-siphonage preventer (see Subsection 2.6.2. of
                                                                                                              Division B).




                                                                                                                                                      water flowing                                            pressure
                                                                                                                                                      under pressure                                           (below atmospheric)




                                                                                                                                                                                                               air
                                                                                                                                                                                                               (atmospheric pressure)




                                                                                                                          (a) Normal operation                               (b) No backflow - valve closed
                                                                                                                              with air valve open                                by atmospheric pressure
                                                                                                                                                                                                                                  EG01119B


                                                                                                          Figure A-1.4.1.2.(1)-C
                                                                                                          Back-siphonage preventer



                                                                                                    1-14 Division A                                                                                            National Plumbing Code of Canada 2020
                                                                                                    Division A                                                                                                          A-1.4.1.2.(1)

                                                                                                                                       branch vent – joins junction of circuit
                                                                                                                                       vent and individual and continuous
                                                                                                                                       vent to the vent stack
                                                                                                                                       individual and                               vent stack
                                                                                                                                       continuous vent
                                                                                                                                                                                    This end of the branch vent
                                                                                                                                       circuit vent                LAV              could be connected to a stack
                                                                                                                                                                                    vent or vent header or lead
                                                                                                                                                                   WCs              directly to outside air.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                                                             EG01120B


                                                                                                          Figure A-1.4.1.2.(1)-D
                                                                                                          Branch vent
                                                                                                          Note to Figure A-1.4.1.2.(1)-D:
                                                                                                          (1) See also the definitions of header and drainage system in Article 1.4.1.2.


                                                                                                                                                                                       continuous vent



                                                                                                                                                                                       wet vent
                                                                                                                                                                                                  EG01121B


                                                                                                          Figure A-1.4.1.2.(1)-E
                                                                                                          Continuous vent




                                                                                                    National Plumbing Code of Canada 2020                                                                                   Division A 1-15
                                                                                                    A-1.4.1.2.(1)                                                                                              Division A

                                                                                                                             roof drain




                                                                                                                                             stack                              WCs

                                                                                                                                                                                     branch
                                                                                                                                             stack (wet vent)                        stack




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                                WCs
                                                                                                          leader                             branch

                                                                                                                                             stack (wet vent)
                                                                                                                                                                                     fixture drain
                                                                                                                                                                         WC          (wet vent)

                                                                                                                                                                                                                     trap arm
                                                                                                                                                                                     trap arm                        fixture
                                                                                                                                                                                     fixture drain                   drain
                                                                                                                                             stack (wet vent)                        branch
                                                                                                                                                                                     (wet vent)


                                                                                                                                                                                                                     fixture
                                                                                                                                                                                     fixture drain                   drain
                                                                                                                                                                                     stack
                                                                                                          storm building
                                                                                                          drain
                                                                                                                                                                                     fixture drain
                                                                                                          street
                                                                                                          level                                                                                                      cleanout
                                                                                                                                                                sanitary building drain                              branch


                                                                                                                                   sewage sump                  branch                                               fixture
                                                                                                          sanitary
                                                                                                                                   discharge                                    WC                                   drain
                                                                                                          building drain
                                                                                                                                                                                                                     (wet vent)


                                                                                                                                                                                                                         EG01122B


                                                                                                          Figure A-1.4.1.2.(1)-F
                                                                                                          Drainage system




                                                                                                    1-16 Division A                                                                          National Plumbing Code of Canada 2020
                                                                                                    Division A                                                                                  A-1.4.1.2.(1)

                                                                                                                             roof drain        vent header


                                                                                                                                                                    circuit vent

                                                                                                                                               stack vent                                            stack vent

                                                                                                                                                                  WCs

                                                                                                                                              vent stack               relief vent                   branch
                                                                                                                                               dual and             additional                       vent
                                                                                                                                               continuous           circuit vent                     individual




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                               vent                                                  vent


                                                                                                                                                                  WCs
                                                                                                          leader
                                                                                                                                                                    continuous
                                                                                                                                                                    vent                             individual
                                                                                                                                              vent stack                                             vent
                                                                                                                                                             WC

                                                                                                                                                                                                     individual
                                                                                                                                                                                                     vent
                                                                                                                                                                    individual and
                                                                                                                                          vent stack                continuous vent




                                                                                                                                          branch vent
                                                                                                                                                                    individual and
                                                                                                          storm building                                            continuous vent
                                                                                                          drain

                                                                                                          street
                                                                                                          level                                                                                      cleanout
                                                                                                                                                                                                     continuous
                                                                                                                                          sewage                                                     vent
                                                                                                                                          sump vent
                                                                                                          sanitary
                                                                                                          building drain                                          WC



                                                                                                                                                                                                         EG01122C


                                                                                                          Figure A-1.4.1.2.(1)-G
                                                                                                          Venting system



                                                                                                                                               vent


                                                                                                                                               trap weir
                                                                                                                                                                   fixture outlet pipe

                                                                                                                                               trap arm
                                                                                                                                                                   dip
                                                                                                                                                                                     EG01124C


                                                                                                          Figure A-1.4.1.2.(1)-H
                                                                                                          Fixture outlet pipe and trap arm


                                                                                                    National Plumbing Code of Canada 2020                                                           Division A 1-17
                                                                                                    A-1.4.1.2.(1)                                                                                                                   Division A

                                                                                                                                                  upper end of vent header
                                                                                                                                                  terminates in outside air

                                                                                                                                                  vent header




                                                                                                                                                  vent stacks
                                                                                                                                                  or stack vents




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                  upper end of vent header
                                                                                                                                                  terminates in outside air

                                                                                                                                                  vent header




                                                                                                                                                  vent stacks
                                                                                                                                                  or stack vents
                                                                                                                                                  stack vent

                                                                                                                                                                                                        EG01125A


                                                                                                          Figure A-1.4.1.2.(1)-I
                                                                                                          Vent header
                                                                                                          Note to Figure A-1.4.1.2.(1)-I:
                                                                                                          (1) Although a vent header is similar to a branch vent, it serves the special purpose of connecting the tops of stack vents or vent stacks. To
                                                                                                              make certain that it is adequate for that purpose, it is made larger than a branch vent. The developed length used to determine its size is
                                                                                                              the total length from the most distant sanitary drainage pipe to outside air, rather than the shorter length used to size a branch vent.




                                                                                                    1-18 Division A                                                                                         National Plumbing Code of Canada 2020
                                                                                                    Division A                                                                                       A-1.4.1.2.(1)

                                                                                                                                                               vertical
                                                                                                                             nominally vertical                              nominally vertical




                                                                                                                                                          45°         45°
                                                                                                                             nominally horizontal
                                                                                                                                                                             nominally horizontal


                                                                                                                             horizontal




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                             1/8 bend (45° change in
                                                                                                                             direction)
                                                                                                                                             sloped to drain


                                                                                                                             nominally horizontal

                                                                                                                             nominally vertical

                                                                                                                                                                 Y fitting


                                                                                                                                                                                              EG01126A


                                                                                                          Figure A-1.4.1.2.(1)-J
                                                                                                          Nominally horizontal and nominally vertical




                                                                                                    National Plumbing Code of Canada 2020                                                                Division A 1-19
                                                                                                    A-1.4.1.2.(1)                                                                                      Division A



                                                                                                                                                                       nominally horizontal
                                                                                                                                                        < 45°          offset

                                                                                                                                   vertical pipe

                                                                                                                                                                     < 45°


                                                                                                                                                                        nominally vertical
                                                                                                                                                                        offset




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                         (a) Elevation view of vertical pipe


                                                                                                                                   horizontal offset




                                                                                                                                         (b) Plan view of horizontal pipe




                                                                                                                                   nominally vertical                   nominally horizontal
                                                                                                                                   offset                               offset


                                                                                                                                                                     < 45°
                                                                                                                                          < 45°




                                                                                                                                                   horizontal pipe

                                                                                                                                         (c) Elevation view of horizontal pipe
                                                                                                                                                                                   EG01127A


                                                                                                          Figure A-1.4.1.2.(1)-K
                                                                                                          Offset




                                                                                                    1-20 Division A                                                                  National Plumbing Code of Canada 2020
                                                                                                    Division A                                                                                               A-1.5.1.1.(1)

                                                                                                                                                                                  limit of plumbing system



                                                                                                                                                                                     BG

                                                                                                                                                                                                  venting system
                                                                                                                  water system
                                                                                                                                                                                     KS
                                                                                                                  property line
                                                                                                                  water service pipe




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                                     CO
                                                                                                                                                                                                  drainage system
                                                                                                                                                                          1m
                                                                                                                                            building sewer               building drain

                                                                                                                           public water main (or private water source)
                                                                                                                           public sewer (or private disposal system)                                                EG01128B


                                                                                                          Figure A-1.4.1.2.(1)-L
                                                                                                          Plumbing system


                                                                                                    A-1.5.1.1.(1) Application of Referenced Documents. Documents referenced in the NPC may
                                                                                                    contain provisions covering a wide range of issues, including issues that are unrelated to the objectives and
                                                                                                    functional statements stated in Parts 2 and 3 of Division A, respectively. Sentence 1.5.1.1.(1) is intended to make
                                                                                                    it clear that, whereas referencing these documents in the NPC generally has the effect of making the provisions
                                                                                                    of those documents part of the Code, provisions that are unrelated to plumbing systems or to the objectives and
                                                                                                    functional statements attributed to the provisions in Division B where the document is referenced are excluded.
                                                                                                    Furthermore, many documents referenced in the NPC contain references to other documents, which may
                                                                                                    also, in turn, refer to other documents. These secondary and tertiary referenced documents may contain
                                                                                                    provisions that are unrelated to plumbing systems or to the objectives and functional statements of the NPC:
                                                                                                    such provisions—no matter how far down the chain of references they occur—are not included in the intent
                                                                                                    of Sentence 1.5.1.1.(1).




                                                                                                    National Plumbing Code of Canada 2020                                                                           Division A 1-21
                                        Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




1-22 Division A




National Plumbing Code of Canada 2020
                                                                                                    Division A



                                                                                                    Part 2
                                                                                                    Objectives




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                      2.1.          Application
                                                                                                      2.1.1.        Application ........................................ 2-1

                                                                                                      2.2.          Objectives
                                                                                                      2.2.1.        Objectives ......................................... 2-1

                                                                                                                    Notes to Part 2 .................. 2-5




                                                                                                    National Plumbing Code of Canada 2020
                                        Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




National Plumbing Code of Canada 2020
                                                                                                    Division A



                                                                                                    Part 2
                                                                                                    Objectives




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    Section 2.1. Application
                                                                                                    2.1.1.           Application
                                                                                                    2.1.1.1.         Application
                                                                                                                        1) This Part applies to all plumbing systems covered in this Code. (See
                                                                                                                     Article 1.1.1.1.)

                                                                                                    2.1.1.2.         Application of Objectives
                                                                                                                        1) The objectives described in this Part apply
                                                                                                                        a) to all plumbing systems covered in this Code (see Article 1.1.1.1.), and
                                                                                                                        b) only to the extent that they relate to compliance with this Code as required
                                                                                                                           in Article 1.2.1.1.


                                                                                                    Section 2.2. Objectives
                                                                                                    2.2.1.           Objectives
                                                                                                    2.2.1.1.         Objectives
                                                                                                                        1) The objectives of this Code are as follows (see Note A-2.2.1.1.(1)):

                                                                                                                             OS     Safety
                                                                                                                                    An objective of this Code is to limit the probability that, as a result of the
                                                                                                                                    design or installation of the plumbing system, a person in or adjacent to
                                                                                                                                    the building or facility will be exposed to an unacceptable risk of injury.
                                                                                                                                    OS1     Fire Safety
                                                                                                                                            An objective of this Code is to limit the probability that, as a
                                                                                                                                            result of the design or installation of the plumbing system, a
                                                                                                                                            person in or adjacent to the building or facility will be exposed to
                                                                                                                                            an unacceptable risk of injury due to fire. The risks of injury due
                                                                                                                                            to fire addressed in this Code are those caused by—
                                                                                                                                            OS1.1 – fire or explosion occurring
                                                                                                                                            OS1.4 – fire safety systems failing to function as expected
                                                                                                                                    OS2     Structural Safety
                                                                                                                                            An objective of this Code is to limit the probability that, as a
                                                                                                                                            result of the design or installation of the plumbing system, a person
                                                                                                                                            in or adjacent to the building will be exposed to an unacceptable
                                                                                                                                            risk of injury due to structural failure. The risks of injury due to
                                                                                                                                            structural failure addressed in this Code are those caused by—
                                                                                                                                            OS2.1 – loads bearing on the building elements that exceed
                                                                                                                                                    their load-bearing capacity


                                                                                                    National Plumbing Code of Canada 2020                                                                     Division A 2-1
                                                                                                    2.2.1.1.                                                                                   Division A

                                                                                                                          OS3    Safety in Use
                                                                                                                                 An objective of this Code is to limit the probability that, as a
                                                                                                                                 result of the design or installation of the plumbing system, a
                                                                                                                                 person in or adjacent to the building or facility will be exposed to
                                                                                                                                 an unacceptable risk of injury due to hazards. The risks of injury
                                                                                                                                 due to hazards addressed in this Code are those caused by—
                                                                                                                                  OS3.1 – tripping, slipping, falling, contact, drowning or
                                                                                                                                          collision
                                                                                                                                  OS3.2 – contact with hot surfaces or substances
                                                                                                                                  OS3.4 – exposure to hazardous substances




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                     OH   Health
                                                                                                                          An objective of this Code is to limit the probability that, as a result of the
                                                                                                                          design or installation of the plumbing system, a person will be exposed
                                                                                                                          to an unacceptable risk of illness.
                                                                                                                          OH1 Indoor Conditions
                                                                                                                              An objective of this Code is to limit the probability that, as a
                                                                                                                              result of the design or installation of the plumbing system, a person
                                                                                                                              in the building or facility will be exposed to an unacceptable risk
                                                                                                                              of illness due to indoor conditions. The risks of illness due to
                                                                                                                              indoor conditions addressed in this Code are those caused by—
                                                                                                                                  OH1.1 – inadequate indoor air quality
                                                                                                                          OH2 Sanitation
                                                                                                                              An objective of this Code is to limit the probability that, as a
                                                                                                                              result of the design or installation of the plumbing system, a person
                                                                                                                              in the building or facility will be exposed to an unacceptable risk
                                                                                                                              of illness due to unsanitary conditions. The risks of illness due to
                                                                                                                              unsanitary conditions addressed in this Code are those caused
                                                                                                                              by—
                                                                                                                                  OH2.1 – exposure to human or domestic waste
                                                                                                                                  OH2.2 – consumption of contaminated water
                                                                                                                                  OH2.3 – inadequate facilities for personal hygiene
                                                                                                                                  OH2.4 – contact with contaminated surfaces
                                                                                                                          OH5 Hazardous Substances Containment
                                                                                                                              An objective of this Code is to limit the probability that, as a
                                                                                                                              result of the design or installation of the plumbing system, the
                                                                                                                              public will be exposed to an unacceptable risk of illness due to
                                                                                                                              the release of hazardous substances from the building or facility.

                                                                                                                     OP   Protection of the Building or Facility from Water and
                                                                                                                          Sewage Damage
                                                                                                                          OP5    Protection of the Building or Facility from Water and Sewage
                                                                                                                                 Damage
                                                                                                                                 An objective of this Code is to limit the probability that, as a
                                                                                                                                 result of the design or installation of the plumbing system, the
                                                                                                                                 building or facility will be exposed to an unacceptable risk of
                                                                                                                                 damage due to the leakage of service water or sewage.

                                                                                                                     OE   Environment
                                                                                                                          An objective of this Code is to limit the probability that, as a result of the
                                                                                                                          design or installation of the plumbing system, the environment will be
                                                                                                                          affected in an unacceptable manner.




                                                                                                    2-2 Division A                                                          National Plumbing Code of Canada 2020
                                                                                                    Division A                                                                                            2.2.1.1.

                                                                                                                                    OE1     Resources
                                                                                                                                            An objective of this Code is to limit the probability that, as
                                                                                                                                            a result of the design or installation of the plumbing system,
                                                                                                                                            resources will be used in a manner that will have an unacceptable
                                                                                                                                            effect on the environment. The risks of unacceptable effect on the
                                                                                                                                            environment due to use of resources addressed in this Code are
                                                                                                                                            those caused by—
                                                                                                                                            OE1.2 – excessive use of water




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




                                                                                                    National Plumbing Code of Canada 2020                                                                 Division A 2-3
                                        Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




2-4 Division A




National Plumbing Code of Canada 2020
                                                                                                    Division A



                                                                                                    Notes to Part 2
                                                                                                    Objectives




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    A-2.2.1.1.(1)       Objectives.

                                                                                                        Listing of objectives
                                                                                                        Any gaps in the numbering sequence of the objectives are due to the fact that there is a master list of
                                                                                                        objectives covering the four principal National Code Documents—the National Building Code, the
                                                                                                        National Energy Code for Buildings, the National Fire Code and the National Plumbing Code—but not all
                                                                                                        objectives are pertinent to all Codes.

                                                                                                        The building or facility
                                                                                                        Where the term “the building or facility” is used in the wording of the objectives, it refers to the building or
                                                                                                        facility for which compliance with the National Plumbing Code is being assessed.

                                                                                                        Fire Safety
                                                                                                        In the definition of Objective OS1, Fire Safety, the term “person” refers to any individual in or adjacent
                                                                                                        to the building or facility, including the occupants, the public, and emergency responders including
                                                                                                        firefighters when performing their duties.
                                                                                                        Certain technical requirements in the National Model Codes are intended to address the safety of
                                                                                                        emergency responders, including firefighters, when performing their duties.

                                                                                                    These Notes are included for explanatory purposes only and do not form part of the requirements. The number
                                                                                                    that introduces each Note corresponds to the applicable requirement in this Part.




                                                                                                    National Plumbing Code of Canada 2020                                                                         Division A 2-5
                                        Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




2-6 Division A




National Plumbing Code of Canada 2020
                                                                                                    Division A



                                                                                                    Part 3
                                                                                                    Functional Statements




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                      3.1.          Application
                                                                                                      3.1.1.        Application ........................................ 3-1

                                                                                                      3.2.          Functional Statements
                                                                                                      3.2.1.        Functional Statements ..................... 3-1

                                                                                                                    Notes to Part 3 .................. 3-3




                                                                                                    National Plumbing Code of Canada 2020
                                        Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




National Plumbing Code of Canada 2020
                                                                                                    Division A



                                                                                                    Part 3
                                                                                                    Functional Statements




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    Section 3.1. Application
                                                                                                    3.1.1.           Application

                                                                                                    3.1.1.1.         Application

                                                                                                                        1) This Part applies to all plumbing systems covered in this Code. (See
                                                                                                                     Article 1.1.1.1.)

                                                                                                    3.1.1.2.         Application of Functional Statements

                                                                                                                        1) The functional statements described in this Part apply
                                                                                                                        a) to all plumbing systems covered in this Code (see Article 1.1.1.1.), and
                                                                                                                        b) only to the extent that they relate to compliance with this Code as required
                                                                                                                           in Article 1.2.1.1.


                                                                                                    Section 3.2. Functional Statements
                                                                                                    3.2.1.           Functional Statements

                                                                                                    3.2.1.1.         Functional Statements

                                                                                                                         1) The objectives of this Code are achieved by measures, such as those described
                                                                                                                     in the acceptable solutions in Division B, that are intended to allow the plumbing system
                                                                                                                     to perform the following functions (see Note A-3.2.1.1.(1)):
                                                                                                                             F01 To minimize the risk of accidental ignition.
                                                                                                                             F02 To limit the severity and effects of fire or explosions.

                                                                                                                             F20   To support and withstand expected loads and forces.
                                                                                                                             F21   To limit or accommodate dimensional change.

                                                                                                                             F30   To minimize the risk of injury to persons as a result of tripping,
                                                                                                                                   slipping, falling, contact, drowning or collision.
                                                                                                                             F31   To minimize the risk of injury to persons as a result of contact
                                                                                                                                   with hot surfaces or substances.

                                                                                                                             F40   To limit the level of contaminants.
                                                                                                                             F41   To minimize the risk of generation of contaminants.
                                                                                                                             F43   To minimize the risk of release of hazardous substances.
                                                                                                                             F45   To minimize the risk of the spread of disease through communal
                                                                                                                                   shower facilities.
                                                                                                                             F46   To minimize the risk of contamination of potable water.


                                                                                                    National Plumbing Code of Canada 2020                                                                 Division A 3-1
                                                                                                    3.2.1.1.                                                                                 Division A

                                                                                                                     F62   To facilitate the dissipation of water and moisture from the
                                                                                                                           building.

                                                                                                                     F70   To provide potable water.
                                                                                                                     F71   To provide facilities for personal hygiene.
                                                                                                                     F72   To provide facilities for the sanitary disposal of human and
                                                                                                                           domestic wastes.

                                                                                                                     F80   To resist deterioration resulting from expected service conditions.
                                                                                                                     F81   To minimize the risk of malfunction, interference, damage,
                                                                                                                           tampering, lack of use or misuse.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                     F82   To minimize the risk of inadequate performance due to improper
                                                                                                                           maintenance or lack of maintenance.

                                                                                                                     F130 To limit the unnecessary demand and/or consumption of water
                                                                                                                          for fixtures.
                                                                                                                     F131 To limit the unnecessary demand and/or consumption of water
                                                                                                                          for fittings.




                                                                                                    3-2 Division A                                                         National Plumbing Code of Canada 2020
                                                                                                    Division A



                                                                                                    Notes to Part 3
                                                                                                    Functional Statements




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    A-3.2.1.1.(1) Listing of Functional Statements. The numbered functional statements are grouped
                                                                                                    according to functions that deal with closely related subjects. For example, the first group deals with fire
                                                                                                    risks, the second group deals with the structural properties of piping materials, etc. There may be gaps in
                                                                                                    the numbering sequence for the following reasons:
                                                                                                       • Each group has unused numbers which allows for the possible future creation of additional functional
                                                                                                          statements within any one group.
                                                                                                       • There is a master list of functional statements covering the four principal National Code Documents—the
                                                                                                          National Building Code, the National Energy Code for Buildings, the National Fire Code and the National
                                                                                                          Plumbing Code—but not all functional statements are pertinent to all Codes.

                                                                                                    These Notes are included for explanatory purposes only and do not form part of the requirements. The number
                                                                                                    that introduces each Note corresponds to the applicable requirement in this Part.




                                                                                                    National Plumbing Code of Canada 2020                                                                         Division A 3-3
                                        Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




3-4 Division A




National Plumbing Code of Canada 2020
Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




                                                                                          Division B
                                                                   Acceptable Solutions
Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    Division B



                                                                                                    Part 1
                                                                                                    General




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                      1.1.          General
                                                                                                      1.1.1.        Application ........................................ 1-1
                                                                                                      1.1.2.        Objectives and Functional
                                                                                                                    Statements ........................................ 1-1

                                                                                                      1.2.          Terms and Abbreviations
                                                                                                      1.2.1.        Definitions of Words and Phrases .. 1-1
                                                                                                      1.2.2.        Symbols and Other Abbreviations .. 1-2

                                                                                                      1.3.          Referenced Documents
                                                                                                                    and Organizations
                                                                                                      1.3.1.        Referenced Documents ................... 1-2
                                                                                                      1.3.2.        Organizations ................................... 1-8

                                                                                                                    Notes to Part 1 ................ 1-11




                                                                                                    National Plumbing Code of Canada 2020
                                        Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




National Plumbing Code of Canada 2020
                                                                                                    Division B



                                                                                                    Part 1
                                                                                                    General




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    Section 1.1. General
                                                                                                    1.1.1.           Application

                                                                                                    1.1.1.1.         Application

                                                                                                                        1) This Part applies to all plumbing systems covered in this Code. (See
                                                                                                                     Article 1.1.1.1. of Division A.)


                                                                                                    1.1.2.           Objectives and Functional Statements

                                                                                                    1.1.2.1.         Attribution to Acceptable Solutions

                                                                                                                         1) For the purposes of compliance with this Code as required in
                                                                                                                     Clause 1.2.1.1.(1)(b) of Division A, the objectives and functional statements attributed
                                                                                                                     to the acceptable solutions in Division B shall be the objectives and functional
                                                                                                                     statements identified in Section 2.8. (See Note A-1.1.2.1.(1).)



                                                                                                    Section 1.2. Terms and Abbreviations
                                                                                                    1.2.1.           Definitions of Words and Phrases

                                                                                                    1.2.1.1.         Non-defined Terms

                                                                                                                        1) Words and phrases used in Division B that are not included in the list of
                                                                                                                     definitions in Article 1.4.1.2. of Division A shall have the meanings that are commonly
                                                                                                                     assigned to them in the context in which they are used, taking into account the
                                                                                                                     specialized use of terms by the various trades and professions to which the terminology
                                                                                                                     applies.

                                                                                                                        2) Where objectives and functional statements are referred to in Division B, they
                                                                                                                     shall be the objectives and functional statements described in Parts 2 and 3 of Division
                                                                                                                     A.

                                                                                                                        3) Where acceptable solutions are referred to in Division B, they shall be the
                                                                                                                     provisions stated in Part 2.

                                                                                                    1.2.1.2.         Defined Terms

                                                                                                                         1) The words and terms in italics in Division B shall have the meanings assigned
                                                                                                                     to them in Article 1.4.1.2. of Division A.


                                                                                                    National Plumbing Code of Canada 2020                                                                Division B 1-1
                                                                                                    1.2.2.1.                                                                                                            Division B

                                                                                                    1.2.2.              Symbols and Other Abbreviations
                                                                                                    1.2.2.1.            Symbols and Other Abbreviations
                                                                                                                           1) The symbols and other abbreviations in Division B shall have the meanings
                                                                                                                        assigned to them in Article 1.4.2.1. of Division A and Article 1.3.2.1.


                                                                                                    Section 1.3. Referenced Documents and
                                                                                                    Organizations




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    1.3.1.              Referenced Documents
                                                                                                    1.3.1.1.            Effective Date
                                                                                                                           1) Unless otherwise specified herein, the documents referenced in this Code
                                                                                                                        shall include all amendments, revisions, reaffirmations, reapprovals, addenda and
                                                                                                                        supplements effective to 15 July 2019.

                                                                                                    1.3.1.2.            Applicable Editions
                                                                                                                           1) Where documents are referenced in this Code, they shall be the editions
                                                                                                                        designated in Table 1.3.1.2.

                                                                                                                                                            Table 1.3.1.2.
                                                                                                                                 Documents Referenced in the National Plumbing Code of Canada 2020 (1)
                                                                                                                                                 Forming Part of Sentence 1.3.1.2.(1)

                                                                                                       Issuing Agency               Document Number (2)                           Title of Document                       Code Reference
                                                                                                    ANSI/CSA              ANSI Z21.22-2015/CSA 4.4-2015         Relief Valves For Hot Water Supply Systems               2.2.10.11.(1)
                                                                                                    ARCSA/ASPE/ANSI       63-2013                               Rainwater Catchment Systems                              A-2.7.2.4.(1)
                                                                                                    ASHRAE                2011                                  ASHRAE Handbook – HVAC Applications                      A-2.6.3.1.(2)
                                                                                                    ASHRAE                2013                                  ASHRAE Handbook – Fundamentals                           A-2.6.3.1.(2)
                                                                                                    ASME/CSA              ASME A112.3.4-2018/CSA B45.9-18       Macerating Toilet Systems and Waste-Pumping Systems 2.2.2.2.(1)
                                                                                                                                                                for Plumbing Fixtures
                                                                                                    ASME/CSA              ASME A112.4.2-2015/CSA B45.16-15      Personal hygiene devices for water closets               2.2.2.2.(1)
                                                                                                    ASME/CSA              ASME A112.4.14-2017/CSA B125.14-17    Manually Operated Valves for Use in Plumbing Systems     2.2.10.6.(7)
                                                                                                    ASME/CSA              ASME A112.18.1-2018/CSA B125.1-18     Plumbing Supply Fittings                                 2.2.10.6.(1)
                                                                                                                                                                                                                         2.2.10.7.(1)
                                                                                                    ASME/CSA              ASME A112.18.2-2015/CSA B125.2-15     Plumbing Waste Fittings                                  2.2.3.3.(1)
                                                                                                                                                                                                                         2.2.10.6.(6)
                                                                                                    ASME/CSA              ASME A112.18.6-2017/CSA B125.6-17     Flexible water connectors                                2.2.10.18.(1)
                                                                                                    ASME/CSA              ASME A112.19.1-2018/CSA B45.2-18      Enamelled Cast Iron and Enamelled Steel Plumbing         2.2.2.2.(1)
                                                                                                                                                                Fixtures
                                                                                                    ASME/CSA              ASME A112.19.2-2018/CSA B45.1-18      Ceramic Plumbing Fixtures                                2.2.2.2.(1)

                                                                                                    ASME/CSA              ASME A112.19.3-2017/CSA B45.4-17      Stainless Steel Plumbing Fixtures                        2.2.2.2.(1)
                                                                                                    ASME/CSA              ASME A112.19.7-2012/CSA B45.10-12     Hydromassage Bathtub Systems                             2.2.2.2.(1)
                                                                                                    ASME                  B16.3-2016                            Malleable Iron Threaded Fittings: Classes 150 and 300    2.2.6.6.(1)
                                                                                                                                                                                                                         A-2.2.5. to 2.2.8.
                                                                                                    ASME                  B16.4-2016                            Gray Iron Threaded Fittings: Classes 125 and 250         2.2.6.5.(1)
                                                                                                                                                                                                                         A-2.2.5. to 2.2.8.

                                                                                                    ASME                  B16.5-2017                            Pipe Flanges and Flanged Fittings: NPS ½ through NPS 2.2.6.12.(1)
                                                                                                                                                                24 Metric/Inch Standard


                                                                                                    1-2 Division B                                                                              National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                                   1.3.1.2.

                                                                                                                                                          Table 1.3.1.2. (Continued)

                                                                                                       Issuing Agency               Document Number (2)                                 Title of Document                      Code Reference
                                                                                                    ASME                B16.9-2018                                  Factory-Made Wrought Buttwelding Fittings                 2.2.6.11.(1)
                                                                                                                                                                                                                              2.2.6.14.(1)
                                                                                                    ASME                B16.12-2009                                 Cast Iron Threaded Drainage Fittings                      2.2.6.3.(1)
                                                                                                    ASME                B16.15-2018                                 Cast Copper Alloy Threaded Fittings: Classes 125 and      2.2.7.3.(1)
                                                                                                                                                                    250                                                       A-2.2.5. to 2.2.8.
                                                                                                    ASME                B16.18-2018                                 Cast Copper Alloy Solder-Joint Pressure Fittings          2.2.7.6.(1)
                                                                                                                                                                                                                              2.2.7.6.(2)




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                                                                              A-2.2.5. to 2.2.8.
                                                                                                    ASME                B16.22-2018                                 Wrought Copper and Copper Alloy Solder-Joint Pressure 2.2.7.6.(1)
                                                                                                                                                                    Fittings                                              A-2.2.5. to 2.2.8.
                                                                                                    ASME                B16.23-2016                                 Cast Copper Alloy Solder Joint Drainage Fittings: DWV     2.2.7.5.(1)
                                                                                                                                                                                                                              A-2.2.5. to 2.2.8.
                                                                                                    ASME                B16.24-2016                                 Cast Copper Alloy Pipe Flanges, Flanged Fittings, and     2.2.7.2.(1)
                                                                                                                                                                    Valves: Classes 150, 300, 600, 900, 1500, and 2500
                                                                                                    ASME                B16.26-2018                                 Cast Copper Alloy Fittings for Flared Copper Tubes        2.2.7.7.(1)
                                                                                                                                                                                                                              2.2.7.7.(2)
                                                                                                    ASME                B16.29-2017                                 Wrought Copper and Wrought Copper Alloy Solder-Joint 2.2.7.5.(1)
                                                                                                                                                                    Drainage Fittings – DWV                              A-2.2.5. to 2.2.8.
                                                                                                    ASME                B31.9-2017                                  Building Services Piping                                  2.3.2.8.(1)
                                                                                                    ASME                B36.19M-2018                                Stainless Steel Pipe                                      2.2.6.10.(1)
                                                                                                    ASPE                2010                                        Plumbing Engineering Design Handbook, Volume 2            A-2.6.3.1.(2)
                                                                                                    ASPE                2012                                        Plumbing Engineering Design Handbook, Volume 4,           A-2.4.4.3.(1)
                                                                                                                                                                    Chapter 8, Grease Interceptors
                                                                                                    ASSE/ASME/CSA       ASSE 1002-2015/ASME                         Anti-siphon fill valves for water closet tanks            2.2.10.10.(2)
                                                                                                                        A112.1002-2015/CSA B125.12-15
                                                                                                    ASSE                ANSI/ASSE 1010-2004                         Water Hammer Arresters                                    2.2.10.15.(1)
                                                                                                    ASSE/ASME/CSA       ASSE 1016-2017/ASME                         Performance Requirements for Automatic Compensating 2.2.10.7.(1)
                                                                                                                        A112.1016-2017/CSA B125.16-17               Valves for Individual Showers and Tub/Shower        A-2.2.10.6.(3)
                                                                                                                                                                    Combinations
                                                                                                    ASSE/ASME/CSA       ASSE 1037-2015/ASME                         Performance requirements for pressurized flushing         2.2.10.8.(1)
                                                                                                                        A112.1037-2015/CSA B125.37-15               devices for plumbing fixtures
                                                                                                    ASSE                1051-2009                                   Individual and Branch Type Air Admittance Valves for      2.2.10.16.(1)
                                                                                                                                                                    Sanitary Drainage Systems
                                                                                                    ASSE/ASME/CSA       ASSE 1070-2015/ASME                         Performance requirements for water temperature limiting 2.2.10.7.(2)
                                                                                                                        A112.1070-2015/CSA B125.70-15               devices
                                                                                                    ASTM                A53/A53M-18                                 Standard Specification for Pipe, Steel, Black and         2.2.6.7.(4)
                                                                                                                                                                    Hot-Dipped, Zinc-Coated, Welded and Seamless              A-2.2.5. to 2.2.8.
                                                                                                    ASTM                A182/A182M-19                               Standard Specification for Forged or Rolled Alloy and     2.2.6.12.(1)
                                                                                                                                                                    Stainless Steel Pipe Flanges, Forged Fittings, and Valves 2.2.6.13.(1)
                                                                                                                                                                    and Parts for High-Temperature Service
                                                                                                    ASTM                A269/A269M-15a                              Standard Specification for Seamless and Welded            2.2.6.14.(1)
                                                                                                                                                                    Austenitic Stainless Steel Tubing for General Service     A-2.2.5. to 2.2.8.
                                                                                                    ASTM                A312/A312M-18a                              Standard Specification for Seamless, Welded, and          2.2.6.10.(1)
                                                                                                                                                                    Heavily Cold Worked Austenitic Stainless Steel Pipes      A-2.2.5. to 2.2.8.
                                                                                                    ASTM                A351/A351M-18                               Standard Specification for Castings, Austenitic, for      2.2.6.13.(1)
                                                                                                                                                                    Pressure-Containing Parts
                                                                                                    ASTM                A403/A403M-19                               Standard Specification for Wrought Austenitic Stainless   2.2.6.11.(1)
                                                                                                                                                                    Steel Piping Fittings
                                                                                                    ASTM                A518/A518M-99                               Standard Specification for Corrosion-Resistant            2.2.8.1.(1)
                                                                                                                                                                    High-Silicon Iron Castings
                                                                                                    ASTM                B32-08                                      Standard Specification for Solder Metal                   2.2.9.2.(1)



                                                                                                    National Plumbing Code of Canada 2020                                                                                        Division B 1-3
                                                                                                    1.3.1.2.                                                                                                                  Division B

                                                                                                                                                          Table 1.3.1.2. (Continued)

                                                                                                       Issuing Agency               Document Number (2)                                Title of Document                         Code Reference
                                                                                                    ASTM                B42-15a                                     Standard Specification for Seamless Copper Pipe,           2.2.7.1.(1)
                                                                                                                                                                    Standard Sizes                                             A-2.2.5. to 2.2.8.
                                                                                                    ASTM                B43-15                                      Standard Specification for Seamless Red Brass Pipe,        2.2.7.1.(2)
                                                                                                                                                                    Standard Sizes                                             A-2.2.5. to 2.2.8.
                                                                                                    ASTM                B88-16                                      Standard Specification for Seamless Copper Water Tube 2.2.7.4.(1)
                                                                                                                                                                                                                          A-2.2.5. to 2.2.8.
                                                                                                    ASTM                B306-13                                     Standard Specification for Copper Drainage Tube (DWV) 2.2.7.4.(1)




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                                                                          A-2.2.5. to 2.2.8.
                                                                                                    ASTM                B813-16                                     Standard Specification for Liquid and Paste Fluxes for     2.2.9.2.(3)
                                                                                                                                                                    Soldering of Copper and Copper Alloy Tube
                                                                                                    ASTM                B828-16                                     Standard Specification for Making Capillary Joints by      2.3.2.4.(1)
                                                                                                                                                                    Soldering of Copper and Copper Alloy Tube and Fittings
                                                                                                    ASTM                C1053-00                                    Standard Specification for Borosilicate Glass Pipe and     2.2.8.1.(1)
                                                                                                                                                                    Fittings for Drain, Waste, and Vent (DWV) Applications
                                                                                                    ASTM                D2466-17                                    Standard Specification for Poly(Vinyl Chloride) (PVC)      2.2.5.7.(2)
                                                                                                                                                                    Plastic Pipe Fittings, Schedule 40                         A-2.2.5. to 2.2.8.
                                                                                                    ASTM                D2467-15                                    Standard Specification for Poly(Vinyl Chloride) (PVC)      2.2.5.7.(2)
                                                                                                                                                                    Plastic Pipe Fittings, Schedule 80                         A-2.2.5. to 2.2.8.
                                                                                                    ASTM                D3138-04                                    Standard Specification for Solvent Cements for Transition A-2.2.5.9. to
                                                                                                                                                                    Joints Between Acrylonitrile-Butadiene-Styrene (ABS)      2.2.5.11.
                                                                                                                                                                    and Poly(Vinyl Chloride) (PVC) Non-Pressure Piping
                                                                                                                                                                    Components
                                                                                                    ASTM                D3261-16                                    Standard Specification for Butt Heat Fusion Polyethylene 2.2.5.4.(3)
                                                                                                                                                                    (PE) Plastic Fittings for Polyethylene (PE) Plastic Pipe
                                                                                                                                                                    and Tubing
                                                                                                     ASTM               F628-12e2                                   Standard Specification for Acrylonitrile-Butadiene-Styrene 2.2.5.9.(1)
                                                                                                                                                                    (ABS) Schedule 40 Plastic Drain, Waste, and Vent Pipe 2.2.5.11.(1)
                                                                                                                                                                    With a Cellular Core                                       A-2.2.5. to 2.2.8.
                                                                                                     ASTM               F714-13                                     Standard Specification for Polyethylene (PE) Plastic Pipe 2.2.5.5.(1)
                                                                                                                                                                    (DR-PR) Based on Outside Diameter                         A-2.2.5. to 2.2.8.

                                                                                                     ASTM               F3128-19                                    Standard Specification for Poly(Vinyl Chloride) (PVC)      2.2.5.16.(1)
                                                                                                                                                                    Schedule 40 Drain, Waste, and Vent Pipe with a Cellular    A-2.2.5. to 2.2.8.
                                                                                                                                                                    Core
                                                                                                     AWS                ANSI/AWS A5.8M/A5.8:2011                    Specification for Filler Metals for Brazing and Braze      2.2.9.2.(4)
                                                                                                                                                                    Welding
                                                                                                     AWWA               ANSI/AWWA C104/A21.4-13                     Cement-Mortar Lining for Ductile-Iron Pipe and Fittings    2.2.6.4.(2)

                                                                                                     AWWA               ANSI/AWWA C110/A21.10-12                    Ductile-Iron and Gray-Iron Fittings                        2.2.6.4.(3)

                                                                                                     AWWA               ANSI/AWWA C111/A21.11-12                    Rubber-Gasket Joints for Ductile-Iron Pressure Pipe        2.2.6.4.(4)
                                                                                                                                                                    and Fittings
                                                                                                     AWWA               ANSI/AWWA C151/A21.51-09                    Ductile-Iron Pipe, Centrifugally Cast                      2.2.6.4.(1)
                                                                                                                                                                                                                               A-2.2.5. to 2.2.8.
                                                                                                     AWWA               ANSI/AWWA C228-08                           Stainless-Steel Pipe Flanges for Water Service – Sizes 2 2.2.6.12.(1)
                                                                                                                                                                    in. through 72 in. (50 mm through 1,800 mm)
                                                                                                     AWWA               M14-2004                                    Recommended Practice for Backflow Prevention and           A-2.6.2.4.(2)
                                                                                                                                                                    Cross-Connection Control




                                                                                                    1-4 Division B                                                                                   National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                                     1.3.1.2.

                                                                                                                                                           Table 1.3.1.2. (Continued)

                                                                                                       Issuing Agency                Document Number (2)                                   Title of Document                     Code Reference
                                                                                                    CCBFC               NRCC-CONST-56435E                            National Building Code of Canada 2020                      1.1.1.1.(3) (3)
                                                                                                                                                                                                                                1.4.1.2.(1) (3)
                                                                                                                                                                                                                                2.1.3.1.(1)
                                                                                                                                                                                                                                2.1.4.1.(1)
                                                                                                                                                                                                                                2.2.5.11.(2)
                                                                                                                                                                                                                                2.2.5.11.(3)
                                                                                                                                                                                                                                2.2.6.7.(3)
                                                                                                                                                                                                                                2.4.3.1.(1)
                                                                                                                                                                                                                                2.4.10.4.(1)




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                                                                                A-2.2.1.1.(1) (3)
                                                                                                                                                                                                                                A-2.2.5. to 2.2.8.
                                                                                                                                                                                                                                A-2.4.10.
                                                                                                                                                                                                                                A-2.4.10.4.(1)
                                                                                                                                                                                                                                A-3.2.1.1.(1) (3)
                                                                                                    CCBFC               NRCC-CONST-56437E                            National Fire Code of Canada 2020                          2.5.5.2.
                                                                                                                                                                                                                                A-2.2.1.1.(1) (3)
                                                                                                                                                                                                                                A-3.2.1.1.(1) (3)
                                                                                                    CCBFC               NRCC-CONST-56438E                            National Energy Code of Canada for Buildings 2020          A-2.2.1.1.(1) (3)
                                                                                                                                                                                                                                A-3.2.1.1.(1) (3)
                                                                                                    CSA                 A60.1-M1976                                  Vitrified Clay Pipe                                        2.2.5.3.(1)
                                                                                                                                                                                                                                A-2.2.5. to 2.2.8.
                                                                                                    CSA                 A60.3-M1976                                  Vitrified Clay Pipe Joints                                 2.2.5.3.(2)
                                                                                                    CSA                 A257.1:19                                    Non-reinforced circular concrete culvert, storm drain,     2.2.5.2.(1)
                                                                                                                                                                     sewer pipe, and fittings                                   A-2.2.5. to 2.2.8.
                                                                                                    CSA                 A257.2:19                                    Reinforced circular concrete culvert, storm drain, sewer   2.2.5.2.(1)
                                                                                                                                                                     pipe, and fittings                                         A-2.2.5. to 2.2.8.
                                                                                                    CSA                 A257.3:19                                    Joints for circular concrete sewer and culvert pipe,       2.2.5.2.(2)
                                                                                                                                                                     manhole sections, and fittings using rubber gaskets
                                                                                                    CSA                 A257.4:19                                    Precast reinforced circular concrete manhole sections,     2.2.5.2.(5)
                                                                                                                                                                     catch basins, and fittings
                                                                                                    CSA                 CAN/CSA-B45 Series-02                        Plumbing Fixtures                                          2.2.2.2.(1)
                                                                                                    CSA/IAPMO           CSA B45.5-17/IAPMO Z124-2017                 Plastic plumbing fixtures                                  2.2.2.2.(1)
                                                                                                    CSA                 B64.0-11                                     Definitions, general requirements, and test methods for    2.2.10.10.(1)
                                                                                                                                                                     vacuum breakers and backflow preventers
                                                                                                    CSA                 B64.1.1-11                                   Atmospheric vacuum breakers (AVB)                          2.2.10.10.(1)
                                                                                                    CSA                 B64.1.2-11                                   Pressure vacuum breakers (PVB)                             2.2.10.10.(1)
                                                                                                    CSA                 B64.1.3-11                                   Spill-resistant pressure vacuum breakers (SRPVB)           2.2.10.10.(1)
                                                                                                    CSA                 B64.2-11                                     Hose connection vacuum breakers (HCVB)                     2.2.10.10.(1)
                                                                                                    CSA                 B64.2.1-11                                   Hose connection vacuum breakers (HCVB) with manual         2.2.10.10.(1)
                                                                                                                                                                     draining feature
                                                                                                    CSA                 B64.2.2-11                                   Hose connection vacuum breakers (HCVB) with                2.2.10.10.(1)
                                                                                                                                                                     automatic draining feature
                                                                                                    CSA                 B64.3-11                                     Dual check valve backflow preventers with atmospheric      2.2.10.10.(1)
                                                                                                                                                                     port (DCAP)
                                                                                                    CSA                 B64.4-11                                     Reduced pressure principle (RP) backflow preventers        2.2.10.10.(1)
                                                                                                                                                                                                                                2.6.2.4.(2)
                                                                                                    CSA                 B64.4.1-11                                   Reduced pressure principle backflow preventers for fire    2.2.10.10.(1)
                                                                                                                                                                     protection systems (RPF)                                   2.6.2.4.(2)
                                                                                                                                                                                                                                2.6.2.4.(4)
                                                                                                                                                                                                                                A-2.6.2.4.(2)
                                                                                                    CSA                 B64.5-11                                     Double check valve (DCVA) backflow preventers              2.2.10.10.(1)
                                                                                                                                                                                                                                2.6.2.4.(2)




                                                                                                    National Plumbing Code of Canada 2020                                                                                          Division B 1-5
                                                                                                    1.3.1.2.                                                                                                                    Division B

                                                                                                                                                           Table 1.3.1.2. (Continued)

                                                                                                       Issuing Agency                Document Number (2)                                 Title of Document                        Code Reference
                                                                                                    CSA                 B64.5.1-11                                   Double check valve backflow preventers for fire protection 2.2.10.10.(1)
                                                                                                                                                                     systems (DCVAF)                                            2.6.2.4.(2)
                                                                                                                                                                                                                                A-2.6.2.4.(2)
                                                                                                    CSA                 B64.6-11                                     Dual check valve (DuC) backflow preventers                  2.2.10.10.(1)
                                                                                                                                                                                                                                 2.6.2.4.(2)
                                                                                                    CSA                 B64.6.1-11                                   Dual check valve backflow preventers for fire protection    2.2.10.10.(1)
                                                                                                                                                                     systems (DuCF)                                              2.6.2.4.(2)
                                                                                                                                                                                                                                 A-2.6.2.4.(2)




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    CSA                 B64.7-11                                     Laboratory faucet vacuum breakers (LFVB)                    2.2.10.10.(1)
                                                                                                    CSA                 B64.8-11                                     Dual check valve backflow preventers with intermediate      2.2.10.10.(1)
                                                                                                                                                                     vent (DuCV)
                                                                                                    CSA                 B64.9-11                                     Single check valve backflow preventers for fire protection 2.2.10.10.(1)
                                                                                                                                                                     systems (SCVAF)                                            2.6.2.4.(2)
                                                                                                                                                                                                                                A-2.6.2.4.(2)
                                                                                                    CSA                 B64.10-17                                    Selection and installation of backflow preventers           2.6.2.1.(3)
                                                                                                    CSA                 B70-12                                       Cast iron soil pipe, fittings, and means of joining         2.2.6.1.(1)
                                                                                                                                                                                                                                 2.4.6.4.(5)
                                                                                                                                                                                                                                 A-2.2.5. to 2.2.8.
                                                                                                    CSA                 B70.1-03                                     Frames and Covers for Maintenance Holes and                 2.2.6.2.(1)
                                                                                                                                                                     Catchbasins
                                                                                                    CSA                 B125.3-18                                    Plumbing fittings                                           2.2.10.6.(1)
                                                                                                                                                                                                                                 2.2.10.7.(2)
                                                                                                                                                                                                                                 2.2.10.7.(3)
                                                                                                                                                                                                                                 A-2.6.1.11.(1)
                                                                                                    CSA                 CAN/CSA-B126.0-13                            General requirements and methods of testing for water       2.7.2.4.(6)
                                                                                                                                                                     cisterns
                                                                                                    CSA                 CAN/CSA-B126.1-13                            Installation of water cisterns                              2.7.2.4.(6)
                                                                                                    CSA                 CAN/CSA-B127.3-18                            Fibrocement drain, waste, and vent pipe and pipe fittings 2.2.5.1.(1)
                                                                                                                                                                                                                               A-2.2.5. to 2.2.8.
                                                                                                    CSA                 CAN/CSA-B128.1-06                            Design and Installation of Non-Potable Water Systems        2.7.1.2.(1)
                                                                                                                                                                                                                                 A-2.7.1.1.(1)
                                                                                                    CSA                 B137.1-17                                    Polyethylene (PE) pipe, tubing, and fittings for cold-water 2.2.5.4.(1)
                                                                                                                                                                     pressure services                                           A-2.2.5. to 2.2.8.
                                                                                                    CSA                 B137.2-17                                    Polyvinylchloride (PVC) injection-moulded gasketed          2.2.5.7.(3)
                                                                                                                                                                     fittings for pressure applications                          A-2.2.5. to 2.2.8.
                                                                                                    CSA                 B137.3-17                                    Rigid polyvinylchloride (PVC) pipe and fittings for         2.2.5.7.(1)
                                                                                                                                                                     pressure applications                                       A-2.2.5. to 2.2.8.
                                                                                                    CSA                 B137.5-17                                    Crosslinked polyethylene (PEX) tubing systems for           2.2.5.6.(1)
                                                                                                                                                                     pressure applications                                       A-2.2.5. to 2.2.8.
                                                                                                                                                                                                                                 A-2.2.5.6.(1)
                                                                                                    CSA                 B137.6-17                                    Chlorinated polyvinylchloride (CPVC) pipe, tubing, and      2.2.5.8.(1)
                                                                                                                                                                     fittings for hot- and cold-water distribution systems       A-2.2.5. to 2.2.8.
                                                                                                                                                                                                                                 A-2.2.5.9. to
                                                                                                                                                                                                                                 2.2.5.11.
                                                                                                    CSA                 B137.9-17                                    Polyethylene/aluminum/polyethylene (PE-AL-PE)               2.2.5.12.(1)
                                                                                                                                                                     composite pressure-pipe systems                             A-2.2.5. to 2.2.8.
                                                                                                                                                                                                                                 A-2.2.5.12.(1)
                                                                                                    CSA                 B137.10-17                                   Crosslinked polyethylene/aluminum/crosslinked               2.2.5.12.(4)
                                                                                                                                                                     polyethylene (PEX-AL-PEX) composite pressure-pipe           2.2.5.13.(1)
                                                                                                                                                                     systems                                                     A-2.2.5. to 2.2.8.
                                                                                                                                                                                                                                 A-2.2.5.13.(1)




                                                                                                    1-6 Division B                                                                                     National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                                    1.3.1.2.

                                                                                                                                                          Table 1.3.1.2. (Continued)

                                                                                                       Issuing Agency               Document Number (2)                                 Title of Document                       Code Reference
                                                                                                    CSA                 B137.11-17                                  Polypropylene (PP-R) pipe and fittings for pressure        2.2.5.14.(1)
                                                                                                                                                                    applications                                               A-2.2.5. to 2.2.8.
                                                                                                                                                                                                                               A-2.2.5.14.(1)
                                                                                                    CSA                 B137.18-17                                  Polyethylene of raised temperature resistance (PE-RT)      2.2.5.15.(1)
                                                                                                                                                                    tubing systems for pressure applications                   A-2.2.5. to 2.2.8.
                                                                                                                                                                                                                               A-2.2.5.15.(1)
                                                                                                    CSA                 B158.1-1976                                 Cast Brass Solder Joint Drainage, Waste and Vent           2.2.10.1.(1)
                                                                                                                                                                    Fittings




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    CSA                 B181.1-18                                   Acrylonitrile-butadiene-styrene (ABS) drain, waste, and    2.2.5.9.(1)
                                                                                                                                                                    vent pipe and pipe fittings                                2.2.5.10.(1)
                                                                                                                                                                                                                               2.2.5.11.(1)
                                                                                                                                                                                                                               2.4.6.4.(5)
                                                                                                                                                                                                                               A-2.2.5. to 2.2.8.
                                                                                                                                                                                                                               A-2.2.5.9. to
                                                                                                                                                                                                                               2.2.5.11.
                                                                                                    CSA                 B181.2-18                                   Polyvinylchloride (PVC) and chlorinated polyvinylchloride 2.2.5.9.(1)
                                                                                                                                                                    (CPVC) drain, waste, and vent pipe and pipe fittings      2.2.5.10.(1)
                                                                                                                                                                                                                              2.2.5.11.(1)
                                                                                                                                                                                                                              2.2.5.16.(1)
                                                                                                                                                                                                                              2.2.5.16.(2)
                                                                                                                                                                                                                              2.4.6.4.(5)
                                                                                                                                                                                                                              A-2.2.5. to 2.2.8.
                                                                                                                                                                                                                              A-2.2.5.9. to
                                                                                                                                                                                                                              2.2.5.11.
                                                                                                    CSA                 B181.3-18                                   Polyolefin and polyvinylidene fluoride (PVDF) laboratory   2.2.8.1.(1)
                                                                                                                                                                    drainage systems                                           A-2.2.5. to 2.2.8.
                                                                                                    CSA                 B182.1-18                                   Plastic drain and sewer pipe and pipe fittings             2.2.5.9.(1)
                                                                                                                                                                                                                               2.4.6.4.(5)
                                                                                                                                                                                                                               A-2.2.5. to 2.2.8.
                                                                                                    CSA                 B182.2-18                                   PSM type polyvinylchloride (PVC) sewer pipe and fittings 2.2.5.9.(1)
                                                                                                                                                                                                                             A-2.2.5. to 2.2.8.
                                                                                                    CSA                 B182.4-18                                   Profile polyvinylchloride (PVC) sewer pipe and fittings    2.2.5.9.(1)
                                                                                                                                                                                                                               A-2.2.5. to 2.2.8.
                                                                                                    CSA                 B182.6-18                                   Profile polyethylene (PE) sewer pipe and fittings for      2.2.5.9.(1)
                                                                                                                                                                    leak-proof sewer applications                              A-2.2.5. to 2.2.8.
                                                                                                    CSA                 B182.8-18                                   Profile polyethylene (PE) storm sewer and drainage pipe 2.2.5.9.(1)
                                                                                                                                                                    and fittings
                                                                                                    CSA                 B242-05                                     Groove- and Shoulder-Type Mechanical Pipe Couplings        2.2.10.4.(1)
                                                                                                    CSA                 B272-93                                     Prefabricated Self-Sealing Roof Vent Flashings             2.2.10.14.(2)
                                                                                                    CSA                 CAN/CSA-B356-10                             Water pressure reducing valves for domestic water          2.2.10.12.(1)
                                                                                                                                                                    supply systems
                                                                                                    CSA                 B481.0-12                                   Material, design, and construction requirements for        2.2.3.2.(3)
                                                                                                                                                                    grease interceptors
                                                                                                    CSA                 B481.3-12                                   Sizing, selection, location, and installation of grease    2.2.3.2.(3)
                                                                                                                                                                    interceptors
                                                                                                    CSA                 B481.4-12                                   Maintenance of grease interceptors                         A-2.2.3.2.(3)
                                                                                                    CSA                 CAN/CSA-B483.1-07                           Drinking Water Treatment Systems                           2.2.10.17.(1)
                                                                                                    CSA                 B602-16                                     Mechanical couplings for drain, waste, and vent pipe       2.2.10.4.(2)
                                                                                                                                                                    and sewer pipe
                                                                                                    CSA/ICC             CSA B805-18/ICC 805-2018                    Rainwater harvesting systems                               2.7.2.4.(4)
                                                                                                                                                                                                                               A-2.7.2.4.(1)
                                                                                                    CSA                 CAN/CSA-F379 SERIES-09 (excluding           Packaged solar domestic hot water systems                  2.2.10.13.(1)
                                                                                                                        Supplement F379S1-11)                       (liquid-to-liquid heat transfer)




                                                                                                    National Plumbing Code of Canada 2020                                                                                         Division B 1-7
                                                                                                    1.3.2.1.                                                                                                                            Division B

                                                                                                                                                                   Table 1.3.1.2. (Continued)

                                                                                                          Issuing Agency                   Document Number (2)                                    Title of Document                         Code Reference
                                                                                                     CSA                       CAN/CSA-F383-08                                 Installation of packaged solar domestic hot water           2.6.1.8.(1)
                                                                                                                                                                               systems
                                                                                                     CSA                       CAN/CSA-G401-14                                 Corrugated steel pipe products                              2.2.6.8.(1)
                                                                                                                                                                                                                                           A-2.2.5. to 2.2.8.
                                                                                                     McGraw-Hill               2009                                            International Plumbing Codes Handbook                       A-2.6.3.
                                                                                                     NFPA                      13D-2016                                        Standard for the Installation of Sprinkler Systems in One- 2.6.3.1.(3)
                                                                                                                                                                               and Two-Family Dwellings and Manufactured Homes




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                     NIST                      Building Materials and Structures Report        Water-Distributing Systems for Buildings                    A-2.6.3.
                                                                                                                               BMS 79, 1941
                                                                                                     NSF                       NSF Pro 151-8-1-95                              Health Effects from Rainwater Catchment System              A-2.7.2.3.(2)
                                                                                                                                                                               Components
                                                                                                     TIAC                      2013                                            Mechanical Insulation Best Practices Guide                  A-2.3.5.3.
                                                                                                     ULC                       CAN/ULC-S114:2018                               Standard Method of Test for Determination of                1.4.1.2.(1) (3)
                                                                                                                                                                               Non-Combustibility in Building Materials

                                                                                                    Notes to Table 1.3.1.2.:
                                                                                                    (1)   While every effort was made to ensure the accuracy of the information in this Table, the NRC is not responsible for the accuracy, timeliness or
                                                                                                          reliability of the content presented therein. For all purposes of interpreting and applying the referenced standards, Code users should refer to the
                                                                                                          most recent official versions of the referenced editions.
                                                                                                    (2)   Some documents may have been reaffirmed or reapproved. Check with the applicable issuing agency for up-to-date information.
                                                                                                    (3)   Code reference is in Division A.


                                                                                                    1.3.2.                  Organizations
                                                                                                    1.3.2.1.                Abbreviations of Proper Names
                                                                                                                               1) The abbreviations of proper names in this Code shall have the meanings
                                                                                                                            assigned to them in this Article.
                                                                                                                           ANSI ................. American National Standards Institute (www.ansi.org)
                                                                                                                           ARCSA ............. American Rainwater Catchment Systems Association (www.arcsa.org)
                                                                                                                           ASHRAE .......... American Society of Heating, Refrigerating and Air-Conditioning
                                                                                                                                             Engineers (www.ashrae.org)
                                                                                                                           ASME ............... American Society of Mechanical Engineers (www.asme.org)
                                                                                                                           ASPE ................. American Society of Plumbing Engineers (www.aspe.org)
                                                                                                                           ASSE ................. American Society of Sanitary Engineering (www.asse-plumbing.org)
                                                                                                                           ASTM ............... ASTM International (www.astm.org)
                                                                                                                           AWS .................. American Welding Society (www.aws.org)
                                                                                                                           AWWA ............. American Water Works Association (www.awwa.org)
                                                                                                                           CAN ................. National Standard of Canada designation (www.scc.ca)
                                                                                                                           CCBFC .............. Canadian Commission on Building and Fire Codes (see NRC)
                                                                                                                           CSA ................... CSA Group (www.csagroup.ca)
                                                                                                                           IAPMO ............. International Association of Plumbing and Mechanical Officials
                                                                                                                                               (www.iapmo.org)
                                                                                                                           ICC .................... International Code Council (www.iccsafe.org)
                                                                                                                           NBC .................. National Building Code of Canada 2020
                                                                                                                           NFC .................. National Fire Code of Canada 2020
                                                                                                                           NFPA ................ National Fire Protection Association (www.nfpa.org)
                                                                                                                           NIST ................. National Institute of Standards and Technology (www.nist.gov)
                                                                                                                           NPC .................. National Plumbing Code of Canada 2020


                                                                                                    1-8 Division B                                                                                              National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                          1.3.2.1.

                                                                                                                   NRC .................. National Research Council of Canada (nrc.canada.ca)
                                                                                                                   NSF ................... National Sanitation Foundation International (www.nsf.org)
                                                                                                                   TIAC ................. Thermal Insulation Association of Canada (www.tiac.ca)
                                                                                                                   ULC .................. ULC Standards (canada.ul.com/ulcstandards)




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




                                                                                                    National Plumbing Code of Canada 2020                                                               Division B 1-9
                                        Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




1-10 Division B




National Plumbing Code of Canada 2020
                                                                                                    Division B



                                                                                                    Notes to Part 1
                                                                                                    General




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    A-1.1.2.1.(1) Objectives and Functional Statements Attributed to Acceptable
                                                                                                    Solutions. The objectives and functional statements attributed to each Code provision are shown in
                                                                                                    Table 2.8.1.1.
                                                                                                    Many provisions in Division B serve as modifiers of or pointers to other provisions or serve other clarification
                                                                                                    or explanatory purposes. In most cases, no objectives and functional statements have been attributed to such
                                                                                                    provisions, which therefore do not appear in the above-mentioned table.
                                                                                                    For provisions that serve as modifiers of or pointers to other referenced provisions and that do not have any
                                                                                                    objectives and functional statements attributed to them, the objectives and functional statements that should be
                                                                                                    used are those attributed to the provisions they reference.

                                                                                                    These Notes are included for explanatory purposes only and do not form part of the requirements. The number
                                                                                                    that introduces each Note corresponds to the applicable requirement in this Part.




                                                                                                    National Plumbing Code of Canada 2020                                                                         Division B 1-11
                                        Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




1-12 Division B




National Plumbing Code of Canada 2020
                                                                                                    Division B



                                                                                                    Part 2
                                                                                                    Plumbing Systems




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                      2.1.          General
                                                                                                      2.1.1.        Application ........................................ 2-1
                                                                                                      2.1.2.        Service Connections ....................... 2-1
                                                                                                      2.1.3.        Location of Fixtures ......................... 2-1
                                                                                                      2.1.4.        Seismic Design ................................. 2-2

                                                                                                      2.2.          Materials and Equipment
                                                                                                      2.2.1.        General .............................................. 2-2
                                                                                                      2.2.2.        Fixtures ............................................. 2-2
                                                                                                      2.2.3.        Traps and Interceptors ..................... 2-3
                                                                                                      2.2.4.        Pipe Fittings ...................................... 2-4
                                                                                                      2.2.5.        Non-Metallic Pipe and Fittings ........ 2-4
                                                                                                      2.2.6.        Ferrous Pipe and Fittings ................ 2-8
                                                                                                      2.2.7.        Non-Ferrous Pipe and Fittings ...... 2-11
                                                                                                      2.2.8.        Corrosion-Resistant Materials ...... 2-12
                                                                                                      2.2.9.        Jointing Materials ........................... 2-12
                                                                                                      2.2.10.       Miscellaneous Materials ................ 2-13

                                                                                                      2.3.          Piping
                                                                                                      2.3.1.        Application ...................................... 2-16
                                                                                                      2.3.2.        Construction and Use of Joints .... 2-16
                                                                                                      2.3.3.        Joints and Connections ................ 2-17
                                                                                                      2.3.4.        Support of Piping ........................... 2-19
                                                                                                      2.3.5.        Protection of Piping ....................... 2-21
                                                                                                      2.3.6.        Testing of Drainage or Venting
                                                                                                                    Systems ........................................... 2-21
                                                                                                      2.3.7.        Testing of Potable Water
                                                                                                                    Systems ........................................... 2-23

                                                                                                      2.4.          Drainage Systems
                                                                                                      2.4.1.        Application ...................................... 2-23
                                                                                                      2.4.2.        Connections to Drainage
                                                                                                                    Systems ........................................... 2-23
                                                                                                      2.4.3.        Location of Fixtures ....................... 2-25
                                                                                                      2.4.4.        Treatment of Sewage and Waste ... 2-25
                                                                                                      2.4.5.        Traps ................................................ 2-26
                                                                                                      2.4.6.        Arrangement of Drainage Piping .. 2-27
                                                                                                      2.4.7.        Cleanouts ........................................ 2-28
                                                                                                      2.4.8.        Minimum Slope and Length of
                                                                                                                    Drainage Pipes ............................... 2-30
                                                                                                      2.4.9.        Size of Drainage Pipes ................... 2-30
                                                                                                      2.4.10.       Hydraulic Loads ............................. 2-33




                                                                                                    National Plumbing Code of Canada 2020
                                                                                                                                                                                        Division B

                                                                                                    2.5.     Venting Systems
                                                                                                    2.5.1.   Vent Pipes for Traps ....................... 2-37
                                                                                                    2.5.2.   Wet Venting ..................................... 2-38
                                                                                                    2.5.3.   Circuit Venting ................................ 2-38
                                                                                                    2.5.4.   Vent Pipes for Stacks ..................... 2-39
                                                                                                    2.5.5.   Miscellaneous Vent Pipes ............. 2-40
                                                                                                    2.5.6.   Arrangement of Vent Pipes ........... 2-41
                                                                                                    2.5.7.   Minimum Size of Vent Pipes .......... 2-42
                                                                                                    2.5.8.   Sizing of Vent Pipes ....................... 2-44
                                                                                                    2.5.9.   Air Admittance Valves .................... 2-47

                                                                                                    2.6.     Potable Water Systems




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    2.6.1.   Arrangement of Piping .................. 2-47
                                                                                                    2.6.2.   Protection from Contamination .... 2-50
                                                                                                    2.6.3.   Size and Capacity of Pipes ........... 2-53

                                                                                                    2.7.     Non-Potable Water
                                                                                                             Systems
                                                                                                    2.7.1.   Non-Potable Water Systems .......... 2-57
                                                                                                    2.7.2.   Non-Potable Rainwater
                                                                                                             Harvesting Systems ....................... 2-57

                                                                                                    2.8.     Objectives and
                                                                                                             Functional Statements
                                                                                                    2.8.1.   Objectives and Functional
                                                                                                             Statements ...................................... 2-59

                                                                                                             Notes to Part 2 ................ 2-71




                                                                                                                                                                      National Plumbing Code of Canada 2020
                                                                                                    Division B



                                                                                                    Part 2
                                                                                                    Plumbing Systems




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    Section 2.1. General
                                                                                                    2.1.1.           Application
                                                                                                    2.1.1.1.         Application
                                                                                                                        1) This Part applies to all plumbing systems covered in this Code. (See
                                                                                                                     Article 1.1.1.1. of Division A.)

                                                                                                    2.1.2.           Service Connections
                                                                                                    2.1.2.1.         Sanitary Drainage Systems
                                                                                                                        1) Except where supplying systems that are covered in Section 2.7., sanitary
                                                                                                                     drainage systems shall be connected to a public sanitary sewer, a public combined sewer or
                                                                                                                     a private sewage disposal system.
                                                                                                                        2) A combined building drain shall not be installed. (See Note A-2.1.2.1.(2).)

                                                                                                    2.1.2.2.         Storm Drainage Systems
                                                                                                                       1) Except as provided in Section 2.7., storm drainage systems shall be connected to a
                                                                                                                     public storm sewer, a public combined sewer or a designated storm water disposal location.

                                                                                                    2.1.2.3.         Water Distribution Systems
                                                                                                                        1) Except as provided in Section 2.7., water distribution systems shall be connected
                                                                                                                     to a public water main or a potable private water supply system.

                                                                                                    2.1.2.4.         Separate Services
                                                                                                                        1) Piping in any building connected to the public services shall be connected
                                                                                                                     separately from piping of any other building, except that an ancillary building on the
                                                                                                                     same property may be served by the same service. (See Note A-2.1.2.4.(1).)

                                                                                                    2.1.3.           Location of Fixtures
                                                                                                    2.1.3.1.         Lighting and Ventilation Requirements
                                                                                                                        1) Plumbing fixtures shall not be installed in a room that is not lighted and
                                                                                                                     ventilated in accordance with the appropriate requirements in Parts 3, 6 and 9 of
                                                                                                                     Division B of the NBC.

                                                                                                    2.1.3.2.         Accessibility
                                                                                                                        1) Every fixture, appliance, interceptor, cleanout, valve, device or piece of equipment
                                                                                                                     shall be located so that it is readily accessible for use, cleaning and maintenance.


                                                                                                    National Plumbing Code of Canada 2020                                                                  Division B 2-1
                                                                                                    2.1.4.1.                                                                                          Division B

                                                                                                    2.1.4.           Seismic Design
                                                                                                    2.1.4.1.         Seismic Restraints and Design
                                                                                                                        1) Plumbing systems in buildings constructed in accordance with
                                                                                                                     Part 3 of Division B of the NBC shall be designed and installed to accommodate
                                                                                                                     the seismic forces addressed in Subsection 4.1.8. of Division B of the NBC. (See
                                                                                                                     Note A-2.1.4.1.(1).)


                                                                                                    Section 2.2. Materials and Equipment




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    2.2.1.           General
                                                                                                    2.2.1.1.         Exposure of Materials
                                                                                                                       1) Where unusual conditions exist, such as excessively corrosive soil or water, only
                                                                                                                     materials suited for use in such locations shall be used.
                                                                                                                       2) Materials and equipment used in a drainage system where excessively corrosive
                                                                                                                     wastes are present shall be suitable for the purpose.

                                                                                                    2.2.1.2.         Restrictions on Re-Use
                                                                                                                        1) Materials and equipment that have been used for a purpose other than the
                                                                                                                     distribution of potable water shall not be subsequently used in a potable water system.

                                                                                                    2.2.1.3.         Identification
                                                                                                                        1) Every length of pipe and every fitting shall
                                                                                                                        a) have cast, stamped or indelibly marked on it the maker's name or mark and
                                                                                                                           the weight or class or quality of the product, or
                                                                                                                        b) be marked in accordance with the relevant standard.
                                                                                                                        2) Markings required in Sentence (1) shall be visible after installation.

                                                                                                    2.2.1.4.         Pipe or Piping
                                                                                                                        1) Where the term pipe or piping is used, it shall also apply to tube or tubing
                                                                                                                     unless otherwise stated.

                                                                                                    2.2.1.5.         Withstanding Pressure
                                                                                                                        1) Piping, fittings and joints used in pressure sewer, forcemain or sump pump
                                                                                                                     discharge applications shall be capable of withstanding at least one and one-half times
                                                                                                                     the maximum potential pressure.

                                                                                                    2.2.1.6.         Working Pressure of a Water Service Pipe
                                                                                                                        1) The working pressure rating of a water service pipe shall not be less than the
                                                                                                                     maximum water main pressure at their point of connection as established by the water
                                                                                                                     supply authority.

                                                                                                    2.2.2.           Fixtures
                                                                                                    2.2.2.1.         Surface Requirements
                                                                                                                       1) Every fixture shall have a smooth, hard, corrosion-resistant surface free of flaws
                                                                                                                     and blemishes that may interfere with cleaning.

                                                                                                    2.2.2.2.         Conformance to Standards
                                                                                                                        1) Except as provided in Article 2.2.2.3.,
                                                                                                                        a) fixtures shall conform to CAN/CSA-B45 Series, “Plumbing Fixtures,”
                                                                                                                        b) vitreous china fixtures shall conform to ASME A112.19.2/CSA B45.1,
                                                                                                                           “Ceramic Plumbing Fixtures,”


                                                                                                    2-2 Division B                                                                  National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                              2.2.3.1.

                                                                                                                        c) enamelled cast-iron fixtures shall conform to ASME A112.19.1/CSA B45.2,
                                                                                                                            “Enamelled Cast Iron and Enamelled Steel Plumbing Fixtures,”
                                                                                                                        d) porcelain-enamelled steel fixtures shall conform to
                                                                                                                            ASME A112.19.1/CSA B45.2, “Enamelled Cast Iron and Enamelled Steel
                                                                                                                            Plumbing Fixtures,”
                                                                                                                        e) stainless steel fixtures shall conform to ASME A112.19.3/CSA B45.4,
                                                                                                                            “Stainless Steel Plumbing Fixtures,”
                                                                                                                        f) plastic fixtures shall conform to CSA B45.5/IAPMO Z124, “Plastic plumbing
                                                                                                                            fixtures,”
                                                                                                                        g) hydromassage bathtubs shall conform to ASME A112.19.7/CSA B45.10,
                                                                                                                            “Hydromassage Bathtub Systems,”
                                                                                                                        h) macerating toilet systems shall conform to ASME A112.3.4/CSA B45.9,




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                            “Macerating Toilet Systems and Waste-Pumping Systems for Plumbing
                                                                                                                            Fixtures,” and
                                                                                                                         i) personal hygiene devices for water closets shall conform to ASME
                                                                                                                            A112.4.2/CSA B45.16, “Personal hygiene devices for water closets.”

                                                                                                    2.2.2.3.         Showers
                                                                                                                        1) Shower receptors shall be constructed and arranged so that water cannot leak
                                                                                                                     through the walls or floor.
                                                                                                                        2) Not more than 6 shower heads shall be served by a single shower drain.
                                                                                                                        3) Where 2 or more shower heads are served by a shower drain, the floor shall be
                                                                                                                     sloped and the drain located so that water from one head cannot flow over the area
                                                                                                                     that serves another head. (See Note A-2.2.2.3.(3).)
                                                                                                                        4) Except for column showers, where a battery of shower heads is installed, the
                                                                                                                     horizontal distance between 2 adjacent shower heads shall be not less than 750 mm.

                                                                                                    2.2.2.4.         Concealed Overflows
                                                                                                                        1) A dishwashing sink and a food preparation sink shall not have concealed
                                                                                                                     overflows. (See Note A-2.2.2.4.(1).)

                                                                                                    2.2.2.5.         Water Closets in Public Washrooms
                                                                                                                        1) Where a water closet is installed in a washroom for public use, it shall be of the
                                                                                                                     elongated type and provided with a seat of the open front type.

                                                                                                    2.2.3.           Traps and Interceptors
                                                                                                    2.2.3.1.         Traps
                                                                                                                        1) Except as provided for in Sentence (2), traps shall
                                                                                                                        a) have a trap seal depth of not less than 38 mm,
                                                                                                                        b) be so designed that failure of the seal walls will cause exterior leakage, and
                                                                                                                         c) have a water seal that does not depend on the action of moving parts.
                                                                                                                     (See Note A-2.2.3.1.(1) and (3).)
                                                                                                                       2) The trap seal depth on fixtures draining to an acid waste system shall be a
                                                                                                                     minimum of 50 mm.
                                                                                                                        3) Except for a floor-mounted service sink, every trap that serves a lavatory, a sink
                                                                                                                     or a laundry tray shall
                                                                                                                         a) be provided with a cleanout plug located at the lowest point of the trap and
                                                                                                                             of the same material as the trap, except that a cast-iron trap shall be provided
                                                                                                                             with a brass cleanout plug, or
                                                                                                                         b) be designed so that part of the trap can be removed for cleaning purposes.
                                                                                                                     (See Note A-2.2.3.1.(1) and (3).)
                                                                                                                        4) A bell trap shall not be installed in a drainage system. (See Note A-2.2.3.1.(4).)
                                                                                                                        5) A drum trap shall not be used as a fixture trap unless required to serve as an
                                                                                                                     interceptor and access for servicing is provided.


                                                                                                    National Plumbing Code of Canada 2020                                                                   Division B 2-3
                                                                                                    2.2.3.2.                                                                                               Division B

                                                                                                    2.2.3.2.         Interceptors

                                                                                                                        1) Interceptors shall be designed so that they can be readily cleaned.

                                                                                                                        2) Grease interceptors shall
                                                                                                                        a) be designed so that they do not become air bound, and
                                                                                                                        b) not have a water jacket.

                                                                                                                        3) Grease interceptors shall be selected and installed in conformance with
                                                                                                                        a) CSA B481.0, “Material, design, and construction requirements for grease
                                                                                                                           interceptors,” and
                                                                                                                        b) CSA B481.3, “Sizing, selection, location, and installation of grease




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                           interceptors.”
                                                                                                                     (See Note A-2.2.3.2.(3).)

                                                                                                    2.2.3.3.         Tubular Traps

                                                                                                                        1) Tubular metal or plastic traps conforming to ASME A112.18.2/CSA B125.2,
                                                                                                                     “Plumbing Waste Fittings,” shall be used only in accessible locations.

                                                                                                    2.2.4.           Pipe Fittings

                                                                                                    2.2.4.1.         T and Cross Fittings
                                                                                                                     (See Note A-2.2.4.1.)

                                                                                                                        1) A T fitting shall not be used in a drainage system, except to connect a vent pipe.

                                                                                                                        2) A cross fitting shall not be used in a drainage system.

                                                                                                    2.2.4.2.         Sanitary T Fittings
                                                                                                                     (See Note A-2.2.4.2.)

                                                                                                                        1) A single or double sanitary T fitting shall not be used in a nominally horizontal
                                                                                                                     sanitary drainage pipe, except that a single sanitary T fitting may be used to connect a
                                                                                                                     vent pipe.

                                                                                                                        2) A double sanitary T fitting shall not be used to connect the trap arms of
                                                                                                                        a) back outlet water closets installed back-to-back, or
                                                                                                                        b) 2 urinals where no cleanout fitting is provided above the connection.

                                                                                                    2.2.4.3.         90° Elbows

                                                                                                                        1) Except as permitted in Sentence (2), 90° elbows of NPS 4 or less whose
                                                                                                                     centre-line radius is less than the NPS of the pipe shall not be used to join
                                                                                                                     2 sanitary drainage pipes.

                                                                                                                        2) For sanitary drainage systems of NPS 4 or less, 90° elbows described in
                                                                                                                     Sentence (1) shall only be permitted
                                                                                                                        a) to change the direction of piping from horizontal to vertical, in the direction
                                                                                                                            of flow,
                                                                                                                        b) where a trap arm enters a wall, or
                                                                                                                        c) to connect trap arms as permitted by Sentence 2.5.6.3.(2).

                                                                                                    2.2.5.           Non-Metallic Pipe and Fittings
                                                                                                                     (For a summary of pipe applications, see Note A-2.2.5. to 2.2.8.)

                                                                                                    2.2.5.1.         Fibrocement Pipe and Fittings

                                                                                                                         1) Fibrocement pipe and fittings for use in a drain, waste or vent system shall
                                                                                                                     conform to CAN/CSA-B127.3, “Fibrocement drain, waste, and vent pipe and pipe
                                                                                                                     fittings.”


                                                                                                    2-4 Division B                                                                       National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                             2.2.5.7.

                                                                                                    2.2.5.2.         Concrete Pipe and Fittings
                                                                                                                        1) Concrete pipe shall conform to
                                                                                                                        a) CSA A257.1, “Non-reinforced circular concrete culvert, storm drain, sewer
                                                                                                                           pipe, and fittings,” or
                                                                                                                        b) CSA A257.2, “Reinforced circular concrete culvert, storm drain, sewer pipe,
                                                                                                                           and fittings.”
                                                                                                                        2) Joints with internal elastomeric gaskets shall conform to CSA A257.3, “Joints for
                                                                                                                     circular concrete sewer and culvert pipe, manhole sections, and fittings using rubber
                                                                                                                     gaskets.”
                                                                                                                        3) Concrete fittings fabricated on the site from lengths of pipe shall not be used.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                     (See Note A-2.2.5.2.(3).)
                                                                                                                        4) Concrete pipe shall not be used above ground inside a building.
                                                                                                                        5) Precast reinforced circular concrete manhole sections, catch basins and fittings
                                                                                                                     shall conform to CSA A257.4, “Precast reinforced circular concrete manhole sections,
                                                                                                                     catch basins, and fittings.”

                                                                                                    2.2.5.3.         Vitrified Clay Pipe and Fittings
                                                                                                                        1) Vitrified clay pipe and fittings shall conform to CSA A60.1-M, “Vitrified Clay
                                                                                                                     Pipe.”
                                                                                                                        2) Couplings and joints for vitrified clay pipe shall conform to CSA A60.3-M,
                                                                                                                     “Vitrified Clay Pipe Joints.”
                                                                                                                        3) Vitrified clay pipe and fittings shall not be used except for an underground
                                                                                                                     part of a drainage system.

                                                                                                    2.2.5.4.         Polyethylene Pipe and Fittings
                                                                                                                       1) Polyethylene water pipe, tubing and fittings shall conform to Series 160 of CSA
                                                                                                                     B137.1, “Polyethylene (PE) pipe, tubing, and fittings for cold-water pressure services.”
                                                                                                                        2) Polyethylene water pipe shall not be used except for a water service pipe.
                                                                                                                        3) Butt fusion fittings for polyethylene pipe shall conform to ASTM D3261,
                                                                                                                     “Standard Specification for Butt Heat Fusion Polyethylene (PE) Plastic Fittings for
                                                                                                                     Polyethylene (PE) Plastic Pipe and Tubing.”

                                                                                                    2.2.5.5.         Polyethylene Pipe Used Underground
                                                                                                                        1) Polyethylene pipe used underground outside a building for the rehabilitation
                                                                                                                     of existing drainage systems using trenchless technology shall conform to ASTM F714,
                                                                                                                     “Standard Specification for Polyethylene (PE) Plastic Pipe (DR-PR) Based on Outside
                                                                                                                     Diameter,” and shall be HDPE 3408 and SDR 11 or heavier. (See Note A-2.2.5.5.(1).)

                                                                                                    2.2.5.6.         Crosslinked Polyethylene Pipe and Fittings
                                                                                                                        1) Crosslinked polyethylene pipe and manufacturer-approved fittings used in hot
                                                                                                                     and cold potable water systems shall conform to CSA B137.5, “Crosslinked polyethylene
                                                                                                                     (PEX) tubing systems for pressure applications.” (See Note A-2.2.5.6.(1).)

                                                                                                    2.2.5.7.         PVC Pipe and Fittings
                                                                                                                        1) PVC water pipe, fittings and solvent cement shall
                                                                                                                        a) conform to CSA B137.3, “Rigid polyvinylchloride (PVC) pipe and fittings
                                                                                                                           for pressure applications,” and
                                                                                                                        b) have a pressure rating of not less than 1 100 kPa.
                                                                                                                        2) PVC water pipe fittings shall conform to
                                                                                                                        a) ASTM D2466, “Standard Specification for Poly(Vinyl Chloride) (PVC)
                                                                                                                           Plastic Pipe Fittings, Schedule 40,” or
                                                                                                                        b) ASTM D2467, “Standard Specification for Poly(Vinyl Chloride) (PVC)
                                                                                                                           Plastic Pipe Fittings, Schedule 80.”


                                                                                                    National Plumbing Code of Canada 2020                                                                  Division B 2-5
                                                                                                    2.2.5.8.                                                                                                Division B

                                                                                                                          3) PVC injection-moulded gasketed fittings shall conform to CSA B137.2,
                                                                                                                       “Polyvinylchloride (PVC) injection-moulded gasketed fittings for pressure
                                                                                                                       applications.”
                                                                                                                          4) PVC water pipe and fittings referred to in Sentences (1), (2) and (3) shall not be
                                                                                                                       used in a hot water system.

                                                                                                    2.2.5.8.           CPVC Pipe, Fittings and Solvent Cements
                                                                                                                          1) CPVC hot and cold water pipe, fittings and solvent cements shall conform to
                                                                                                                       CSA B137.6, “Chlorinated polyvinylchloride (CPVC) pipe, tubing, and fittings for
                                                                                                                       hot- and cold-water distribution systems.”




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                          2) The design temperature and design pressure of a CPVC piping system shall
                                                                                                                       conform to Table 2.2.5.8.

                                                                                                                                                          Table 2.2.5.8.
                                                                                                                                Maximum Permitted Pressure for CPVC Piping at Various Temperatures
                                                                                                                                                Forming Part of Sentence 2.2.5.8.(2)

                                                                                                                     Maximum Temperature of Water, °C                          Maximum Permitted Pressures, kPa
                                                                                                                                  10                                                       3 150
                                                                                                                                  20                                                       2 900
                                                                                                                                  30                                                       2 500
                                                                                                                                  40                                                       2 100
                                                                                                                                  50                                                       1 700
                                                                                                                                  60                                                       1 300
                                                                                                                                  70                                                       1 000
                                                                                                                                  82                                                        690


                                                                                                    2.2.5.9.           Plastic Pipe, Fittings and Solvent Cement Used Underground
                                                                                                                       (See Note A-2.2.5.9. to 2.2.5.11.)
                                                                                                                          1) Plastic pipe, fittings and solvent cement used underground outside a building
                                                                                                                       or under a building in a drainage system shall conform to
                                                                                                                           a) ASTM F628, “Standard Specification for Acrylonitrile-Butadiene-Styrene
                                                                                                                              (ABS) Schedule 40 Plastic Drain, Waste, and Vent Pipe With a Cellular Core,”
                                                                                                                           b) CSA B181.1, “Acrylonitrile-butadiene-styrene (ABS) drain, waste, and vent
                                                                                                                              pipe and pipe fittings,”
                                                                                                                           c) CSA B181.2, “Polyvinylchloride (PVC) and chlorinated polyvinylchloride
                                                                                                                              (CPVC) drain, waste, and vent pipe and pipe fittings,”
                                                                                                                          d) CSA B182.1, “Plastic drain and sewer pipe and pipe fittings,” with a pipe
                                                                                                                              stiffness not less than 320 kPa,
                                                                                                                           e) CSA B182.2, “PSM type polyvinylchloride (PVC) sewer pipe and fittings,”
                                                                                                                              with a pipe stiffness not less than 320 kPa,
                                                                                                                           f) CSA B182.4, “Profile polyvinylchloride (PVC) sewer pipe and fittings,” with
                                                                                                                              a pipe stiffness not less than 320 kPa,
                                                                                                                          g) CSA B182.6, “Profile polyethylene (PE) sewer pipe and fittings for leak-proof
                                                                                                                              sewer applications,” with a pipe stiffness not less than 320 kPa, or
                                                                                                                          h) CSA B182.8, “Profile polyethylene (PE) storm sewer and drainage pipe and
                                                                                                                              fittings,” for Type 1 joints and non-perforated pipes.

                                                                                                    2.2.5.10.          Transition Solvent Cement
                                                                                                                       (See Note A-2.2.5.9. to 2.2.5.11.)
                                                                                                                          1) Solvent cement for transition joints shall conform to
                                                                                                                          a) CSA B181.1, “Acrylonitrile-butadiene-styrene (ABS) drain, waste, and vent
                                                                                                                             pipe and pipe fittings,” or
                                                                                                                          b) CSA B181.2, “Polyvinylchloride (PVC) and chlorinated polyvinylchloride
                                                                                                                             (CPVC) drain, waste, and vent pipe and pipe fittings.”


                                                                                                    2-6 Division B                                                                     National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                             2.2.5.15.

                                                                                                                        2) Transition solvent cement shall only be used for joining an ABS drainage system
                                                                                                                     to a PVC drainage system.

                                                                                                    2.2.5.11.        Plastic Pipe, Fittings and Solvent Cement Used in Buildings
                                                                                                                     (See Note A-2.2.5.9. to 2.2.5.11.)

                                                                                                                        1) Plastic pipe, fittings and solvent cement used inside or under a building in a
                                                                                                                     drainage or venting system shall conform to
                                                                                                                         a) ASTM F628, “Standard Specification for Acrylonitrile-Butadiene-Styrene
                                                                                                                            (ABS) Schedule 40 Plastic Drain, Waste, and Vent Pipe With a Cellular Core,”
                                                                                                                         b) CSA B181.1, “Acrylonitrile-butadiene-styrene (ABS) drain, waste, and vent




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                            pipe and pipe fittings,” or
                                                                                                                         c) CSA B181.2, “Polyvinylchloride (PVC) and chlorinated polyvinylchloride
                                                                                                                            (CPVC) drain, waste, and vent pipe and pipe fittings.”

                                                                                                                        2) Requirements for combustible piping in relation to fire safety shall conform to
                                                                                                                     Sentences 3.1.5.19.(1) and 9.10.9.8.(3), (5) and (6), and Articles 3.1.9.4., 9.10.9.7. and
                                                                                                                     9.10.9.9. of Division B of the NBC.

                                                                                                                        3) Where noncombustible piping pierces a fire separation or a firestop, the
                                                                                                                     requirements for firestopping of Subsection 3.1.9., Sentence 9.10.9.6.(1) and Article
                                                                                                                     9.10.16.4. of Division B of the NBC shall apply.

                                                                                                    2.2.5.12.        Polyethylene/Aluminum/Polyethylene Composite Pipe and Fittings

                                                                                                                        1) PE/AL/PE composite pipe and fittings shall conform to CSA B137.9,
                                                                                                                     “Polyethylene/aluminum/polyethylene (PE-AL-PE) composite pressure-pipe systems.”
                                                                                                                     (See Note A-2.2.5.12.(1).)

                                                                                                                        2) Except as provided in Sentences (3) and (4), PE/AL/PE pipe and fittings shall
                                                                                                                     not be used in hot water systems.

                                                                                                                        3) PE/AL/PE pipe with a pressure rating of 690 kPa or greater at 82°C shall be
                                                                                                                     permitted for hot water systems.

                                                                                                                        4) PE/AL/PE pipe with a pressure rating of 690 kPa or greater at 82°C
                                                                                                                     shall be used with fittings that conform to CSA B137.10, “Crosslinked
                                                                                                                     polyethylene/aluminum/crosslinked polyethylene (PEX-AL-PEX) composite
                                                                                                                     pressure-pipe systems,” in hot water systems.

                                                                                                    2.2.5.13.        Crosslinked Polyethylene/Aluminum/Crosslinked Polyethylene
                                                                                                                     Composite Pressure Pipe and Fittings

                                                                                                                        1) PEX/AL/PEX composite pipe and fittings used in hot and
                                                                                                                     cold potable water systems shall conform to CSA B137.10, “Crosslinked
                                                                                                                     polyethylene/aluminum/crosslinked polyethylene (PEX-AL-PEX) composite
                                                                                                                     pressure-pipe systems.” (See Note A-2.2.5.13.(1).)

                                                                                                    2.2.5.14.        Polypropylene Pipe and Fittings

                                                                                                                        1) Polypropylene pipe and fittings used for hot and cold potable water systems
                                                                                                                     shall conform to CSA B137.11, “Polypropylene (PP-R) pipe and fittings for pressure
                                                                                                                     applications.” (See Note A-2.2.5.14.(1).)

                                                                                                    2.2.5.15.        Polyethylene of Raised Temperature Tube and Fittings

                                                                                                                         1) Polyethylene of raised temperature (PE-RT) tube and manufacturer-approved
                                                                                                                     fittings used in hot and cold potable water systems shall conform to CSA B137.18,
                                                                                                                     “Polyethylene of raised temperature resistance (PE-RT) tubing systems for pressure
                                                                                                                     applications.” (See Note A-2.2.5.15.(1).)

                                                                                                                        2) The use of PE-RT tube shall conform to Table 2.2.5.15.


                                                                                                    National Plumbing Code of Canada 2020                                                                    Division B 2-7
                                                                                                    2.2.5.16.                                                                                                            Division B

                                                                                                                                                                  Table 2.2.5.15.
                                                                                                                                        Permitted Uses of Polyethylene of Raised Temperature (PE-RT) Tube
                                                                                                                                                       Forming Part of Sentence 2.2.5.15.(2)

                                                                                                                                                                       Plumbing Purposes (1)
                                                                                                                             Drainage System                           Venting System                      Potable Water System
                                                                                                     Type of Tube                                        Building
                                                                                                                       Aboveground      Underground       Sewer     Above-        Under-                               Under      Outside
                                                                                                                                                                                               Cold         Hot
                                                                                                                      inside building   under building              ground        ground                              building    building
                                                                                                     PE-RT                  N                 N             N          N            N           P            P           P           P

                                                                                                    Notes to Table 2.2.5.15.:




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    (1)   P = permitted and N = not permitted.


                                                                                                    2.2.5.16.              Cellular Core PVC Pipe and Fittings
                                                                                                                                1) Cellular core PVC pipe shall
                                                                                                                                a) conform to ASTM F3128, “Standard Specification for Poly(Vinyl Chloride)
                                                                                                                                   (PVC) Schedule 40 Drain, Waste, and Vent Pipe with a Cellular Core,” and
                                                                                                                                b) be light grey, as specified in CSA B181.2, “Polyvinylchloride (PVC) and
                                                                                                                                   chlorinated polyvinylchloride (CPVC) drain, waste, and vent pipe and pipe
                                                                                                                                   fittings.”
                                                                                                                             2) Fittings and solvent cements for cellular core PVC pipe shall conform to CSA
                                                                                                                           B181.2, “Polyvinylchloride (PVC) and chlorinated polyvinylchloride (CPVC) drain,
                                                                                                                           waste, and vent pipe and pipe fittings.”
                                                                                                                              3) Cellular core PVC pipe shall only be used in residential buildings containing 1 or
                                                                                                                           2 dwelling units and in row houses that do not exceed 3 storeys in height.

                                                                                                    2.2.6.                 Ferrous Pipe and Fittings
                                                                                                                           (For a summary of pipe applications, see Note A-2.2.5. to 2.2.8.)

                                                                                                    2.2.6.1.               Cast-Iron Drainage and Vent Pipe and Fittings
                                                                                                                             1) Drainage piping, vent piping and fittings made of cast iron shall conform to
                                                                                                                           CSA B70, “Cast iron soil pipe, fittings, and means of joining.”
                                                                                                                                2) Cast-iron soil pipe and fittings shall not be used in a water system.

                                                                                                    2.2.6.2.               Maintenance Holes and Catch Basins
                                                                                                                              1) Cast-iron frames and covers for maintenance holes and catch basins shall
                                                                                                                           conform to CSA B70.1, “Frames and Covers for Maintenance Holes and Catchbasins.”

                                                                                                    2.2.6.3.               Threaded Cast-Iron Drainage Fittings
                                                                                                                             1) Threaded cast-iron drainage fittings shall conform to ASME B16.12, “Cast Iron
                                                                                                                           Threaded Drainage Fittings.”
                                                                                                                                2) Threaded cast-iron drainage fittings shall not be used in a water system.

                                                                                                    2.2.6.4.               Cast-Iron Water Pipes
                                                                                                                             1) Cast-iron water pipes shall conform to ANSI/AWWA C151/A21.51,
                                                                                                                           “Ductile-Iron Pipe, Centrifugally Cast.”
                                                                                                                             2) Cement mortar lining for cast-iron water pipes shall conform to ANSI/AWWA
                                                                                                                           C104/A21.4, “Cement-Mortar Lining for Ductile-Iron Pipe and Fittings.”
                                                                                                                             3) Cast-iron fittings for cast-iron or ductile-iron water pipes shall conform to
                                                                                                                           ANSI/AWWA C110/A21.10, “Ductile-Iron and Gray-Iron Fittings.”
                                                                                                                              4) Rubber gasket joints for cast-iron and ductile-iron pressure pipe for water
                                                                                                                           shall conform to ANSI/AWWA C111/A21.11, “Rubber-Gasket Joints for Ductile-Iron
                                                                                                                           Pressure Pipe and Fittings.”


                                                                                                    2-8 Division B                                                                                    National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                            2.2.6.10.

                                                                                                    2.2.6.5.         Screwed Cast-Iron Water Fittings
                                                                                                                       1) Screwed cast-iron water fittings shall conform to ASME B16.4, “Gray Iron
                                                                                                                     Threaded Fittings: Classes 125 and 250.”
                                                                                                                        2) Screwed cast-iron water fittings used in a water system shall be cement-mortar
                                                                                                                     lined or galvanized.
                                                                                                                        3) Screwed cast-iron water fittings shall not be used in a drainage system.

                                                                                                    2.2.6.6.         Screwed Malleable-Iron Water Fittings
                                                                                                                        1) Screwed malleable-iron water fittings shall conform to ASME B16.3, “Malleable




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                     Iron Threaded Fittings: Classes 150 and 300.”
                                                                                                                       2) Screwed malleable-iron water fittings used in a water system shall be
                                                                                                                     cement-mortar lined or galvanized.
                                                                                                                        3) Screwed malleable-iron water fittings shall not be used in a drainage system.

                                                                                                    2.2.6.7.         Steel Pipe
                                                                                                                        1) Except as provided in Sentences (2) and (3), welded and seamless steel pipe
                                                                                                                     shall not be used in a plumbing system.
                                                                                                                        2) Galvanized steel pipe is permitted to be used in a drainage system or a venting
                                                                                                                     system above ground inside a building.
                                                                                                                        3) Galvanized steel pipe and fittings shall not be used in a water distribution
                                                                                                                     system except
                                                                                                                         a) in buildings of industrial occupancy as described in the NBC, or
                                                                                                                         b) for the repair of existing galvanized steel piping systems.
                                                                                                                     (See Note A-2.2.6.7.(3).)
                                                                                                                        4) Galvanized steel pipe and fittings shall conform to ASTM A53/A53M,
                                                                                                                     “Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded
                                                                                                                     and Seamless.”

                                                                                                    2.2.6.8.         Corrugated Steel Pipe and Couplings
                                                                                                                       1) Corrugated steel pipe and couplings shall conform to CAN/CSA-G401,
                                                                                                                     “Corrugated steel pipe products.”
                                                                                                                        2) Corrugated steel pipe shall only be used underground outside a building in
                                                                                                                     a storm drainage system.
                                                                                                                        3) Couplings for corrugated steel pipe shall be constructed so that when installed
                                                                                                                     they shall
                                                                                                                        a) maintain the pipe alignment,
                                                                                                                        b) resist the separation of adjoining lengths of pipe,
                                                                                                                        c) prevent root penetration, and
                                                                                                                        d) prevent the infiltration of surrounding material.

                                                                                                    2.2.6.9.         Sheet Metal Leaders
                                                                                                                        1) A sheet metal leader shall not be used except above ground outside a building.

                                                                                                    2.2.6.10.        Stainless Steel Pipe
                                                                                                                        1) Stainless steel pipe shall conform to
                                                                                                                        a) ASME B36.19M, “Stainless Steel Pipe,” and
                                                                                                                        b) ASTM A312/A312M, “Standard Specification for Seamless, Welded, and
                                                                                                                           Heavily Cold Worked Austenitic Stainless Steel Pipes.”
                                                                                                                        2) Only grade 304/304L or 316/316L stainless steel pipe shall be used.


                                                                                                    National Plumbing Code of Canada 2020                                                                  Division B 2-9
                                                                                                    2.2.6.11.                                                                                                                Division B

                                                                                                    2.2.6.11.                Stainless Steel Butt Weld Pipe Fittings

                                                                                                                                1) Stainless steel butt weld pipe fittings shall conform to
                                                                                                                                a) ASME B16.9, “Factory-Made Wrought Buttwelding Fittings,” and
                                                                                                                                b) ASTM A403/A403M, “Standard Specification for Wrought Austenitic
                                                                                                                                   Stainless Steel Piping Fittings.”

                                                                                                                                2) Stainless steel butt weld pipe fittings shall be made of a material that matches
                                                                                                                             the grade of the pipe material used.

                                                                                                    2.2.6.12.                Stainless Steel Pipe Flanges




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                1) Stainless steel pipe flanges shall conform to ASME B16.5, “Pipe Flanges and
                                                                                                                             Flanged Fittings: NPS ½ through NPS 24 Metric/Inch Standard,” and
                                                                                                                                a) ASTM A182/A182M, “Standard Specification for Forged or Rolled Alloy
                                                                                                                                   and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for
                                                                                                                                   High-Temperature Service,” or
                                                                                                                                b) ANSI/AWWA C228, “Stainless-Steel Pipe Flanges for Water Service – Sizes 2
                                                                                                                                   in. through 72 in. (50 mm through 1,800 mm).”

                                                                                                                                2) Stainless steel pipe flanges shall be made of a material that matches the grade of
                                                                                                                             the pipe material used.

                                                                                                    2.2.6.13.                Stainless Steel Threaded Fittings

                                                                                                                                1) Stainless steel threaded fittings shall be schedule 40s or greater conforming to
                                                                                                                                a) ASTM A182/A182M, “Standard Specification for Forged or Rolled Alloy
                                                                                                                                   and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for
                                                                                                                                   High-Temperature Service,” or
                                                                                                                                b) ASTM A351/A351M, “Standard Specification for Castings, Austenitic, for
                                                                                                                                   Pressure-Containing Parts.”

                                                                                                                                2) Stainless steel threaded fittings shall be made of a material that matches the
                                                                                                                             grade of the pipe material used.

                                                                                                    2.2.6.14.                Stainless Steel Tube

                                                                                                                                1) Stainless steel tube shall conform to
                                                                                                                                a) ASME B16.9, “Factory-Made Wrought Buttwelding Fittings,” and
                                                                                                                                b) ASTM A269/A269M, “Standard Specification for Seamless and Welded
                                                                                                                                   Austenitic Stainless Steel Tubing for General Service.”

                                                                                                                                2) Only grade 304/304L or 316/316L stainless steel tube shall be used.

                                                                                                    2.2.6.15.                Stainless Steel Pipe and Tube

                                                                                                                                1) The use of stainless steel pipe and tube shall conform to Table 2.2.6.15.

                                                                                                                                                                   Table 2.2.6.15.
                                                                                                                                                   Permitted Uses of Stainless Steel Pipe and Tube
                                                                                                                                                         Forming Part of Sentence 2.2.6.15.(1)

                                                                                                                                                                            Plumbing Purposes (1)
                                                                                                      Stainless Steel Pipe
                                                                                                                                 Water Distribution System                            Drainage System                     Venting System
                                                                                                            or Tube                                            Building Sewer
                                                                                                                               Underground       Aboveground                    Underground         Aboveground   Underground      Aboveground
                                                                                                     Stainless steel pipe           P                P               P               P                  P             P                    P
                                                                                                     Stainless steel tube           P                P               N               N                  N             N                    N

                                                                                                    Notes to Table 2.2.6.15.:
                                                                                                    (1)   P = permitted and N = not permitted.


                                                                                                    2-10 Division B                                                                                     National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                                 2.2.7.5.

                                                                                                    2.2.7.                  Non-Ferrous Pipe and Fittings
                                                                                                                            (For a summary of pipe applications, see Note A-2.2.5. to 2.2.8.)

                                                                                                    2.2.7.1.                Copper and Brass Pipe
                                                                                                                                1) Copper pipe shall conform to
                                                                                                                                a) ASTM B42, “Standard Specification for Seamless Copper Pipe, Standard
                                                                                                                                   Sizes,” and
                                                                                                                                b) Table 2.2.7.4.
                                                                                                                              2) Brass pipe shall conform to ASTM B43, “Standard Specification for Seamless
                                                                                                                            Red Brass Pipe, Standard Sizes.”




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    2.2.7.2.                Brass or Bronze Pipe Flanges and Flanged Fittings
                                                                                                                               1) Brass or bronze pipe flanges and flanged fittings shall conform to ASME B16.24,
                                                                                                                            “Cast Copper Alloy Pipe Flanges, Flanged Fittings, and Valves: Classes 150, 300, 600,
                                                                                                                            900, 1500, and 2500.”

                                                                                                    2.2.7.3.                Brass or Bronze Threaded Water Fittings
                                                                                                                              1) Brass or bronze threaded water fittings shall conform to ASME B16.15, “Cast
                                                                                                                            Copper Alloy Threaded Fittings: Classes 125 and 250.”
                                                                                                                                2) Brass or bronze threaded water fittings shall not be used in a drainage system.

                                                                                                    2.2.7.4.                Copper Tube
                                                                                                                                1) Copper tube shall conform to
                                                                                                                                a) ASTM B88, “Standard Specification for Seamless Copper Water Tube,” or
                                                                                                                                b) ASTM B306, “Standard Specification for Copper Drainage Tube (DWV).”
                                                                                                                               2) Except as provided in Sentence (3), the use of copper tube shall conform to
                                                                                                                            Table 2.2.7.4.
                                                                                                                               3) Copper tube shall not be used for the fixture drain or the portion of the vent
                                                                                                                            pipe below the flood level rim of a urinal.

                                                                                                                                                                       Table 2.2.7.4.
                                                                                                                                                         Permitted Use of Copper Tube and Pipe
                                                                                                                                                    Forming Part of Sentences 2.2.7.1.(1) and 2.2.7.4.(2)

                                                                                                                                                                              Plumbing Purposes (1)
                                                                                                          Type of Copper                     Water Distribution System                         Drainage System          Venting System
                                                                                                           Tube or Pipe        Water                                         Building
                                                                                                                            Service Pipe          Under-       Above-         Sewer         Under-          Above-   Under-        Above-
                                                                                                                                                  ground       ground                       ground          ground   ground        ground
                                                                                                     K & L hard temper            N                 N            P              P              P              P        P             P
                                                                                                     K & L soft temper            P                 P            P              N              N              N        N             N
                                                                                                     M hard temper                N                 N            P              N              N              P        N             P
                                                                                                     M soft temper                N                 N            N              N              N              N        N             N
                                                                                                     DWV                          N                 N            N              N              N              P        N             P

                                                                                                    Notes to Table 2.2.7.4.:
                                                                                                    (1)    P = permitted and N = not permitted.


                                                                                                    2.2.7.5.                Solder-Joint Drainage Fittings
                                                                                                                                1) Solder-joint fittings for drainage systems shall conform to
                                                                                                                                a) ASME B16.23, “Cast Copper Alloy Solder Joint Drainage Fittings: DWV,” or
                                                                                                                                b) ASME B16.29, “Wrought Copper and Wrought Copper Alloy Solder-Joint
                                                                                                                                   Drainage Fittings – DWV.”
                                                                                                                                2) Solder-joint fittings for drainage systems shall not be used in a water system.


                                                                                                    National Plumbing Code of Canada 2020                                                                                     Division B 2-11
                                                                                                    2.2.7.6.                                                                                                Division B

                                                                                                    2.2.7.6.          Solder-Joint Water Fittings
                                                                                                                         1) Except as provided in Sentence (2), solder-joint fittings for water systems shall
                                                                                                                      conform to
                                                                                                                         a) ASME B16.18, “Cast Copper Alloy Solder-Joint Pressure Fittings,” or
                                                                                                                         b) ASME B16.22, “Wrought Copper and Copper Alloy Solder-Joint Pressure
                                                                                                                            Fittings.”
                                                                                                                         2) Solder-joint fittings for water systems not made by casting or the wrought
                                                                                                                      process shall conform to the applicable requirements of ASME B16.18, “Cast Copper
                                                                                                                      Alloy Solder-Joint Pressure Fittings.”




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    2.2.7.7.          Flared-Joint Fittings for Copper Water Systems
                                                                                                                        1) Flared-joint fittings for copper tube water systems shall conform to ASME B16.26,
                                                                                                                      “Cast Copper Alloy Fittings for Flared Copper Tubes.”
                                                                                                                         2) Flared-joint fittings for copper tube water systems not made by casting shall
                                                                                                                      conform to the applicable requirements of ASME B16.26, “Cast Copper Alloy Fittings
                                                                                                                      for Flared Copper Tubes.”

                                                                                                    2.2.7.8.          Lead Waste Pipe and Fittings
                                                                                                                         1) Lead waste pipe and fittings shall not be used in a water system or as a building
                                                                                                                      sewer.
                                                                                                                         2) When there is a change in nominal pipe size of a lead water closet bend, the
                                                                                                                      change shall be in the vertical section of the bend or made in a manner that prevents
                                                                                                                      the retention of liquid in the bend.

                                                                                                    2.2.8.            Corrosion-Resistant Materials
                                                                                                                      (For a summary of pipe applications, see Note A-2.2.5. to 2.2.8.)

                                                                                                    2.2.8.1.          Pipes and Fittings
                                                                                                                        1) Pipes and fittings to be used for drainage and venting of acid and corrosive
                                                                                                                      wastes shall conform to
                                                                                                                         a) ASTM A518/A518M, “Standard Specification for Corrosion-Resistant
                                                                                                                             High-Silicon Iron Castings,”
                                                                                                                        b) ASTM C1053, “Standard Specification for Borosilicate Glass Pipe and
                                                                                                                             Fittings for Drain, Waste, and Vent (DWV) Applications,” or
                                                                                                                         c) CSA B181.3, “Polyolefin and polyvinylidene fluoride (PVDF) laboratory
                                                                                                                             drainage systems.”

                                                                                                    2.2.9.            Jointing Materials
                                                                                                    2.2.9.1.          Cement Mortar
                                                                                                                         1) Cement mortar shall not be used for jointing.

                                                                                                    2.2.9.2.          Solders and Fluxes
                                                                                                                        1) Solders for solder joint fittings shall conform to ASTM B32, “Standard
                                                                                                                      Specification for Solder Metal.”
                                                                                                                         2) Solders and fluxes having a lead content in excess of 0.2% shall not be used
                                                                                                                      in a potable water system.
                                                                                                                         3) Fluxes for soldered joints shall conform to ASTM B813, “Standard Specification
                                                                                                                      for Liquid and Paste Fluxes for Soldering of Copper and Copper Alloy Tube.”
                                                                                                                        4) Brazing alloys shall conform to ANSI/AWS A5.8M/A5.8, “Specification for Filler
                                                                                                                      Metals for Brazing and Braze Welding,” BCuP range.


                                                                                                    2-12 Division B                                                                       National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                               2.2.10.6.

                                                                                                    2.2.10.               Miscellaneous Materials
                                                                                                    2.2.10.1.             Brass Floor Flanges
                                                                                                                            1) Brass floor flanges shall conform to CSA B158.1, “Cast Brass Solder Joint
                                                                                                                          Drainage, Waste and Vent Fittings.”

                                                                                                    2.2.10.2.             Screws, Bolts, Nuts and Washers
                                                                                                                            1) Every screw, bolt, nut and washer shall be of corrosion-resistant materials
                                                                                                                          when used
                                                                                                                            a) to connect a water closet to a floor flange,




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                            b) to anchor the floor flange to the floor, or
                                                                                                                            c) to anchor the water closet to the floor.

                                                                                                    2.2.10.3.             Cleanout Fittings
                                                                                                                             1) Every plug, cap, nut or bolt that is intended to be removable from a ferrous
                                                                                                                         fitting shall be of a non-ferrous material.
                                                                                                                            2) A cleanout fitting that, as a result of normal maintenance operations, cannot
                                                                                                                         withstand the physical stresses of removal and reinstallation or cannot ensure a
                                                                                                                         gas-tight seal shall not be installed.

                                                                                                    2.2.10.4.            Mechanical Couplings
                                                                                                                            1) Groove- and shoulder-type mechanical couplings for pressure applications
                                                                                                                         shall conform to CSA B242, “Groove- and Shoulder-Type Mechanical Pipe Couplings.”
                                                                                                                           2) Mechanical couplings for non-pressure applications shall conform to CSA B602,
                                                                                                                         “Mechanical couplings for drain, waste, and vent pipe and sewer pipe.”

                                                                                                    2.2.10.5.            Saddle Hubs
                                                                                                                            1) A saddle hub or fitting shall not be installed in drainage, venting or water systems.
                                                                                                                         (See Note A-2.2.10.5.(1).)

                                                                                                    2.2.10.6.            Valves, and Supply and Waste Fittings
                                                                                                                               1) Supply fittings shall conform to
                                                                                                                               a) ASME A112.18.1/CSA B125.1, “Plumbing Supply Fittings,” or
                                                                                                                               b) CSA B125.3, “Plumbing fittings.”
                                                                                                                            2) Except for lavatories in healthcare facilities, emergency eye washes, and
                                                                                                                         emergency showers, supply fittings and individual shower heads shall have an integral
                                                                                                                         means of limiting the maximum water flow rate to that specified in Table 2.2.10.6.
                                                                                                                         (See Note A-2.2.10.6.(2).)

                                                                                                                                                                      Table 2.2.10.6.
                                                                                                                                                           Water Flow Rates from Supply Fittings
                                                                                                                                                            Forming Part of Sentence 2.2.10.6.(2)

                                                                                                                                         Supply Fittings                                            Maximum Water Flow Rate, L/min
                                                                                                    Lavatory supply fittings
                                                                                                        private                                                                                                  5.7
                                                                                                        public                                                                                                   1.9
                                                                                                    Kitchen supply fittings (except those in industrial, commercial or institutional kitchens)                   8.3
                                                                                                    Shower heads                                                                                                 7.6


                                                                                                                             3) An automatic compensating valve serving an individual shower head
                                                                                                                          addressed in Sentence (1) shall have a water flow rate equal to or less than the shower
                                                                                                                          head it serves. (See Note A-2.2.10.6.(3).)


                                                                                                    National Plumbing Code of Canada 2020                                                                                     Division B 2-13
                                                                                                    2.2.10.7.                                                                                        Division B

                                                                                                                         4) Where multiple shower heads installed in a public showering facility are served
                                                                                                                      by one temperature control, each shower head shall be equipped with a device capable
                                                                                                                      of automatically shutting off the flow of water when the shower head is not in use.
                                                                                                                      (See Note A-2.2.10.6.(4) and (5).)
                                                                                                                         5) Each lavatory in a public washroom shall be equipped with a device capable
                                                                                                                      of automatically shutting off the flow of water when the lavatory is not in use. (See
                                                                                                                      Note A-2.2.10.6.(4) and (5).)
                                                                                                                          6) Waste fittings shall conform to ASME A112.18.2/CSA B125.2, “Plumbing Waste
                                                                                                                      Fittings.”
                                                                                                                         7) Manually operated valves of NPS 4 or less for use in plumbing systems shall




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                      conform to ASME A112.4.14/CSA B125.14, “Manually Operated Valves for Use in
                                                                                                                      Plumbing Systems.” (See Note A-2.2.10.6.(7).)

                                                                                                    2.2.10.7.         Water Temperature Control
                                                                                                                      (See Note A-2.2.10.7.)
                                                                                                                         1) Except as provided in Sentences (2) and (3), water supplied to shower heads or
                                                                                                                      bathtubs shall be controlled by an automatic compensating valve conforming to
                                                                                                                         a) ASME A112.18.1/CSA B125.1, “Plumbing Supply Fittings,” or
                                                                                                                         b) ASSE 1016/ASME A112.1016/CSA B125.16, “Performance Requirements for
                                                                                                                             Automatic Compensating Valves for Individual Showers and Tub/Shower
                                                                                                                             Combinations.”
                                                                                                                         2) The requirement in Sentence (1) is permitted to be waived where hot water
                                                                                                                      supplied only to bathtubs is controlled by
                                                                                                                         a) an automatic compensating valve conforming to CSA B125.3, “Plumbing
                                                                                                                             fittings,” or
                                                                                                                         b) a temperature-limiting device conforming to ASSE 1070/ASME
                                                                                                                             A112.1070/CSA B125.70, “Performance requirements for water temperature
                                                                                                                             limiting devices.”
                                                                                                                         3) The requirement in Sentence (1) is permitted to be waived where the water is
                                                                                                                      supplied by a single tempered water line controlled by an automatic compensating
                                                                                                                      valve conforming to CSA B125.3, “Plumbing fittings.”
                                                                                                                         4) Except as provided in Sentence (5), the temperature of water discharging from
                                                                                                                      a shower head or into a bathtub shall not exceed 49°C.
                                                                                                                         5) In healthcare facilities and seniors' residences, the temperature of water
                                                                                                                      discharging from a shower head or into a bathtub shall
                                                                                                                          a) not exceed 43°C, and
                                                                                                                         b) be adjusted at the shower or bathtub controls.

                                                                                                    2.2.10.8.         Direct Flush Valves
                                                                                                                         1) Direct flush valves shall
                                                                                                                         a) open fully and close positively under service pressure,
                                                                                                                         b) complete their cycle of operation automatically,
                                                                                                                         c) be provided with a means of regulating the volume of water that they
                                                                                                                            discharge,
                                                                                                                         d) be provided with a vacuum breaker unless the fixture is designed so that
                                                                                                                            back-siphonage cannot occur, and
                                                                                                                         e) conform to ASSE 1037/ASME A112.1037/CSA B125.37, “Performance
                                                                                                                            requirements for pressurized flushing devices for plumbing fixtures.”

                                                                                                    2.2.10.9.         Drinking Fountain Bubblers
                                                                                                                         1) The orifice of drinking fountain bubblers shall
                                                                                                                         a) be of the shielded type, and
                                                                                                                         b) direct the water upward at an angle of approximately 45°.
                                                                                                                         2) Drinking fountain bubblers shall include a means of regulating the flow to
                                                                                                                      the orifice.


                                                                                                    2-14 Division B                                                                National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                      2.2.10.14.

                                                                                                                        3) Bubblers shall be installed only on drinking fountains. (See Note A-2.2.10.9.(3).)

                                                                                                    2.2.10.10.       Back-Siphonage Preventers and Backflow Preventers
                                                                                                                        1) Except as provided in Sentence (2), back-siphonage preventers and backflow
                                                                                                                     preventers shall conform to
                                                                                                                         a) CSA B64.0, “Definitions, general requirements, and test methods for
                                                                                                                             vacuum breakers and backflow preventers,”
                                                                                                                         b) CSA B64.1.1, “Atmospheric vacuum breakers (AVB),”
                                                                                                                         c) CSA B64.1.2, “Pressure vacuum breakers (PVB),”
                                                                                                                        d) CSA B64.1.3, “Spill-resistant pressure vacuum breakers (SRPVB),”
                                                                                                                         e) CSA B64.2, “Hose connection vacuum breakers (HCVB),”




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                         f) CSA B64.2.1, “Hose connection vacuum breakers (HCVB) with manual
                                                                                                                             draining feature,”
                                                                                                                        g) CSA B64.2.2, “Hose connection vacuum breakers (HCVB) with automatic
                                                                                                                             draining feature,”
                                                                                                                        h) CSA B64.3, “Dual check valve backflow preventers with atmospheric port
                                                                                                                             (DCAP),”
                                                                                                                         i) CSA B64.4, “Reduced pressure principle (RP) backflow preventers,”
                                                                                                                          j) CSA B64.4.1, “Reduced pressure principle backflow preventers for fire
                                                                                                                             protection systems (RPF),”
                                                                                                                         k) CSA B64.5, “Double check valve (DCVA) backflow preventers,”
                                                                                                                         l) CSA B64.5.1, “Double check valve backflow preventers for fire protection
                                                                                                                             systems (DCVAF),”
                                                                                                                        m) CSA B64.6, “Dual check valve (DuC) backflow preventers,”
                                                                                                                        n) CSA B64.6.1, “Dual check valve backflow preventers for fire protection
                                                                                                                             systems (DuCF),”
                                                                                                                         o) CSA B64.7, “Laboratory faucet vacuum breakers (LFVB),”
                                                                                                                        p) CSA B64.8, “Dual check valve backflow preventers with intermediate vent
                                                                                                                             (DuCV),” or
                                                                                                                        q) CSA B64.9, “Single check valve backflow preventers for fire protection
                                                                                                                             systems (SCVAF).”
                                                                                                                        2) Back-siphonage preventers for tank-type water closets (anti-siphon fill valves)
                                                                                                                     shall conform to ASSE 1002/ASME A112.1002/CSA B125.12, “Anti-siphon fill valves
                                                                                                                     for water closet tanks.”

                                                                                                    2.2.10.11.       Relief Valves
                                                                                                                       1) Temperature-relief, pressure-relief, combined temperature- and pressure-relief,
                                                                                                                     and vacuum-relief valves shall conform to ANSI Z21.22/CSA 4.4, “Relief Valves For
                                                                                                                     Hot Water Supply Systems.”

                                                                                                    2.2.10.12.       Reducing Valves
                                                                                                                        1) Direct-acting water-pressure-reducing valves for domestic water supply
                                                                                                                     systems shall conform to CAN/CSA-B356, “Water pressure reducing valves for
                                                                                                                     domestic water supply systems.”

                                                                                                    2.2.10.13.       Solar Domestic Hot Water
                                                                                                                       1) Equipment for solar heating of potable water shall conform to CAN/CSA-F379
                                                                                                                     SERIES, “Packaged solar domestic hot water systems (liquid-to-liquid heat transfer).”

                                                                                                    2.2.10.14.       Vent Pipe Flashing
                                                                                                                        1)    Flashing fabricated on-site for vent pipes shall be fabricated from
                                                                                                                        a)    copper sheet not less than 0.33 mm thick,
                                                                                                                        b)    aluminum sheet not less than 0.48 mm thick,
                                                                                                                        c)    alloyed zinc sheet not less than 0.35 mm thick,
                                                                                                                        d)    lead sheet not less than 1.73 mm thick,
                                                                                                                        e)    galvanized steel sheet not less than 0.33 mm thick, or
                                                                                                                         f)   polychloroprene (neoprene) not less than 2.89 mm thick.


                                                                                                    National Plumbing Code of Canada 2020                                                               Division B 2-15
                                                                                                    2.2.10.15.                                                                                       Division B

                                                                                                                         2) Prefabricated flashing for vent pipes shall conform to CSA B272, “Prefabricated
                                                                                                                      Self-Sealing Roof Vent Flashings.” (See Article 2.5.6.5. for location of vent pipe
                                                                                                                      terminals.)

                                                                                                    2.2.10.15.        Water Hammer Arresters
                                                                                                                        1) Water hammer arresters shall conform to ANSI/ASSE 1010, “Water Hammer
                                                                                                                      Arresters.”

                                                                                                    2.2.10.16.        Air Admittance Valves
                                                                                                                         1) Air admittance valves shall conform to ASSE 1051, “Individual and Branch Type
                                                                                                                      Air Admittance Valves for Sanitary Drainage Systems.” (See Note A-2.2.10.16.(1).)




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    2.2.10.17.        Water Treatment Systems
                                                                                                                         1) Point-of-use devices, including their disposable parts, used in potable water
                                                                                                                      treatment systems shall conform to CAN/CSA-B483.1, “Drinking Water Treatment
                                                                                                                      Systems.”

                                                                                                    2.2.10.18.        Flexible Water Connectors
                                                                                                                        1) Flexible water connectors exposed to continuous pressure shall conform to
                                                                                                                      ASME A112.18.6/CSA B125.6, “Flexible water connectors.”


                                                                                                    Section 2.3. Piping
                                                                                                    2.3.1.            Application
                                                                                                    2.3.1.1.          General
                                                                                                                         1) This Section applies to the construction and use of joints and connections, and
                                                                                                                      the arrangement, protection, support and testing of piping.

                                                                                                    2.3.2.            Construction and Use of Joints
                                                                                                    2.3.2.1.          Caulked Lead Drainage Joints
                                                                                                                         1) Caulked lead drainage joints shall not be used except for cast-iron pipe in a
                                                                                                                      drainage system or venting system, or between such pipe and
                                                                                                                          a) other ferrous pipe,
                                                                                                                          b) brass and copper pipe,
                                                                                                                          c) a caulking ferrule, or
                                                                                                                         d) a trap standard.
                                                                                                                         2) Every caulked lead drainage joint shall be firmly packed with oakum and
                                                                                                                      tightly caulked with lead to a depth of not less than 25 mm.
                                                                                                                         3) No paint, varnish or other coating shall be applied on the lead until after the
                                                                                                                      joint has been tested.
                                                                                                                         4) A length of hub and spigot pipe and pipe fittings in a drainage system shall be
                                                                                                                      installed with the hub at the upstream end.

                                                                                                    2.3.2.2.          Wiped Joints
                                                                                                                         1) Wiped joints shall not be used except for sheet lead or lead pipe, or between
                                                                                                                      such pipe and copper pipe or a ferrule.
                                                                                                                         2)   Wiped joints in straight pipe shall
                                                                                                                         a)   be made of solder,
                                                                                                                         b)   have an exposed surface on each side of the joint at least 19 mm wide, and
                                                                                                                         c)   be not less than 10 mm thick at the thickest part.
                                                                                                                         3) Wiped flanged joints shall be reinforced with a lead flange that is not less than
                                                                                                                      19 mm wide.


                                                                                                    2-16 Division B                                                                National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                2.3.3.3.

                                                                                                    2.3.2.3.         Screwed Joints
                                                                                                                        1) In making a screwed joint, the ends of the pipe shall be reamed or filed out to
                                                                                                                     the size of the bore and all chips and cuttings shall be removed.
                                                                                                                        2) No pipe-joint cement or paint shall be applied to the internal threads.

                                                                                                    2.3.2.4.         Soldered Joints
                                                                                                                       1) Soldered joints shall be made in accordance with ASTM B828, “Standard
                                                                                                                     Specification for Making Capillary Joints by Soldering of Copper and Copper Alloy
                                                                                                                     Tube and Fittings.”




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    2.3.2.5.         Flared Joints
                                                                                                                        1) In making a flared joint, the pipe shall be expanded with a proper flaring tool.
                                                                                                                        2) Flared joints shall not be used for hard (drawn) copper tube.

                                                                                                    2.3.2.6.         Mechanical Joints
                                                                                                                        1) Mechanical joints shall be made with compounded elastomeric rings that are
                                                                                                                     held in compression by
                                                                                                                        a) stainless steel or cast-iron clamps, or
                                                                                                                        b) groove and shoulder type mechanical couplings.
                                                                                                                     (See Note A-2.3.2.6.(1).)

                                                                                                    2.3.2.7.         Cold-Caulked Joints
                                                                                                                        1) Cold-caulked joints shall not be used except for bell and spigot pipe in a water
                                                                                                                     system, a drainage system or a venting system.
                                                                                                                        2) Caulking compound used in cold-caulked joints shall be applied according to
                                                                                                                     the manufacturer's directions.
                                                                                                                        3) Cold-caulked joints in a drainage system shall be firmly packed with oakum and
                                                                                                                     tightly caulked with cold caulking compound to a depth of not less than 25 mm.

                                                                                                    2.3.2.8.         Stainless Steel Welded Joints
                                                                                                                        1) Stainless steel welded joints shall conform to ASME B31.9, “Building Services
                                                                                                                     Piping.”
                                                                                                                        2) Butt weld pipe fittings shall be at least as thick as the wall of the pipe used.

                                                                                                    2.3.3.           Joints and Connections
                                                                                                    2.3.3.1.         Drilled and Tapped Joints
                                                                                                                       1) Drilled and tapped joints shall not be made in a sanitary drainage pipe or vent pipe
                                                                                                                     and fittings unless suitable provision has been made for drilling and tapping.

                                                                                                    2.3.3.2.         Extracted Tees
                                                                                                                        1) Tees may be extracted from the wall thickness of Types K and L copper tube
                                                                                                                     used in a water distribution system, provided that
                                                                                                                        a) a tool specifically designed for the purpose is used,
                                                                                                                        b) the branch is at least one NPS smaller than the tube in which the tee is
                                                                                                                            formed,
                                                                                                                        c) the end of the branch incorporates a means to prevent it from penetrating
                                                                                                                            into the run and thereby obstructing flow, and
                                                                                                                        d) the joint at the tee is brazed with a filler metal having a melting point not
                                                                                                                            below 540°C.

                                                                                                    2.3.3.3.         Prohibition of Welding of Pipes and Fittings
                                                                                                                        1) Cast-iron soil pipe and fittings shall not be welded.
                                                                                                                        2) Galvanized steel pipe and fittings shall not be welded.


                                                                                                    National Plumbing Code of Canada 2020                                                                 Division B 2-17
                                                                                                    2.3.3.4.                                                                                               Division B

                                                                                                    2.3.3.4.          Unions and Slip Joints
                                                                                                                      (See Note A-2.2.3.1.(1) and (3).)
                                                                                                                         1) Except as provided in Sentence 2.4.6.3.(6), running thread and packing nut
                                                                                                                      connections and unions with a gasket seal shall not be used downstream of a trap weir
                                                                                                                      in a drainage system or in a venting system.
                                                                                                                         2) Slip joints shall not be used
                                                                                                                         a) in a venting system, or
                                                                                                                         b) in a drainage system, except to connect a fixture trap to a fixture drain in an
                                                                                                                            accessible location.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    2.3.3.5.          Increaser or Reducer
                                                                                                                         1) Connections between 2 pipes of different nominal pipe sizes shall be made with
                                                                                                                      an increaser or a reducer fitting installed so that it permits the system to be completely
                                                                                                                      drained.

                                                                                                    2.3.3.6.          Dissimilar Materials
                                                                                                                         1) Adaptors, connectors or mechanical joints used to join dissimilar materials shall
                                                                                                                      be designed to accommodate the required transition.

                                                                                                    2.3.3.7.          Connection of Roof Drain to Leader
                                                                                                                         1) Roof drains shall be securely connected to a leader and provision shall be made
                                                                                                                      for expansion.

                                                                                                    2.3.3.8.          Connection of Floor or Wall Outlet Fixtures
                                                                                                                         1) Pedestal urinals, floor-mounted water closets and S-trap standards shall be
                                                                                                                      connected to a fixture drain by a floor flange or other means of connection, except that a
                                                                                                                      cast-iron trap standard may be caulked to a cast-iron pipe.
                                                                                                                         2) Except as provided in Sentence (3), floor flanges shall be brass.
                                                                                                                          3) Where cast-iron or plastic pipe is used, a floor flange of the same material
                                                                                                                      is permitted to be used.
                                                                                                                          4) Floor flanges and fixtures shall be securely set on a firm base and fastened
                                                                                                                      to the floor or trap flange of the fixture.
                                                                                                                         5) Water-closet bowls shall be securely attached to the floor flange, floor or wall
                                                                                                                      carrier.
                                                                                                                         6) Joints in a floor flange or between a fixture and the drainage system shall be
                                                                                                                      sealed with a resilient watertight and gas-tight seal.
                                                                                                                         7) Where a lead water-closet stub is used, the length of the stub below the floor
                                                                                                                      flange shall be not less than 75 mm.

                                                                                                    2.3.3.9.          Expansion and Contraction
                                                                                                                      (See Note A-2.3.3.9.)
                                                                                                                          1) The design and installation of every piping system shall include means to
                                                                                                                      accommodate its expansion and contraction caused by temperature changes, movement
                                                                                                                      of the soil, building shrinkage or structural settlement. (See Note A-2.3.3.9.(1).)

                                                                                                    2.3.3.10.         Copper Tube
                                                                                                                         1) Types M and DWV copper tube shall not be bent.

                                                                                                    2.3.3.11.         Indirect Connections
                                                                                                                         1) Where a fixture or device is indirectly connected, the connections shall be made
                                                                                                                      by terminating the fixture drain above the flood level rim of a directly connected fixture to
                                                                                                                      form an air break.


                                                                                                    2-18 Division B                                                                     National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                               2.3.4.5.

                                                                                                                        2) The size of the air break shall at least equal the NPS of the fixture drain, branch
                                                                                                                     or pipe that terminates above the directly connected fixture, and it shall be not less than
                                                                                                                     25 mm. (See Note A-2.3.3.11.(2).)

                                                                                                    2.3.3.12.        Copper Joints Used Underground

                                                                                                                        1) Except as provided in Sentence (2), joints in copper tubes installed underground
                                                                                                                     shall be made with either flared or compression fittings, or be brazed using a brazing
                                                                                                                     alloy within the American Welding Society's AWS-BCuP range.

                                                                                                                        2) Compression fittings shall not be used underground under a building.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    2.3.4.           Support of Piping

                                                                                                    2.3.4.1.         Capability of Support

                                                                                                                        1) Piping shall be provided with support that is capable of keeping the pipe in
                                                                                                                     alignment and bearing the weight of the pipe and its contents.

                                                                                                                        2) Wall-mounted fixtures shall be supported so that no strain is transmitted to
                                                                                                                     the piping.

                                                                                                    2.3.4.2.         Independence of Support

                                                                                                                        1) Piping, fixtures, tanks or devices shall be supported independently of each other.

                                                                                                    2.3.4.3.         Insulation of Support

                                                                                                                        1) Where a hanger or support for copper tube or brass or copper pipe is of a
                                                                                                                     material other than brass or copper, it shall be suitably separated and electrically
                                                                                                                     insulated from the pipe or tube.

                                                                                                                        2) Where a hanger or support for stainless steel pipe or tube is of a material other
                                                                                                                     than stainless steel, it shall be suitably separated and electrically insulated from the
                                                                                                                     pipe or tube.

                                                                                                    2.3.4.4.         Support for Vertical Piping

                                                                                                                        1) Except as provided in Sentence (2), vertical piping shall be supported at its base
                                                                                                                     and at the floor level of alternate storeys by rests, each of which can bear the weight of
                                                                                                                     pipe that is between it and the rest above it.

                                                                                                                        2) The maximum spacing of supports shall be 7.5 m.

                                                                                                    2.3.4.5.         Support for Horizontal Piping

                                                                                                                       1) Nominally horizontal piping that is inside a building shall be braced to prevent
                                                                                                                     swaying and buckling and to control the effects of thrust.

                                                                                                                        2) Nominally horizontal piping shall be supported as stated in Table 2.3.4.5.

                                                                                                                        3)   Where PVC, CPVC or ABS plastic pipe is installed,
                                                                                                                        a)   the pipe shall be aligned without added strain on the piping,
                                                                                                                        b)   the pipe shall not be bent or pulled into position after being welded, and
                                                                                                                        c)   hangers shall not compress, cut or abrade the pipe.

                                                                                                                        4) Where PEX, PE-RT, PP-R, PE/AL/PE or PEX/AL/PEX plastic pipe or tube is
                                                                                                                     installed, hangers shall not compress, cut or abrade the pipe.


                                                                                                    National Plumbing Code of Canada 2020                                                                   Division B 2-19
                                                                                                    2.3.4.5.                                                                                                             Division B

                                                                                                                                                                  Table 2.3.4.5.
                                                                                                                                                     Support for Nominally Horizontal Piping
                                                                                                                                                       Forming Part of Sentence 2.3.4.5.(2)

                                                                                                                                                              Maximum Horizontal Spacing
                                                                                                                           Piping Material                                                         Additional Support Conditions
                                                                                                                                                                   of Supports, m
                                                                                                                                                                                           At the end of branches or fixture drains and at
                                                                                                    ABS or PVC plastic pipe                                              1.2
                                                                                                                                                                                                 changes in direction and elevation
                                                                                                    ABS or PVC plastic trap arm or fixture drain pipe > 1 m
                                                                                                                                                                         n/a                      As close as possible to the trap
                                                                                                    long
                                                                                                    Cast-iron pipe                                                       3.0                     At or adjacent to each hub or joint




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    Cast-iron pipe with mechanical joints that is ≤ 300 mm
                                                                                                                                                                         1.0                                   None
                                                                                                    long between adjacent fittings
                                                                                                    Copper tube or copper and brass pipe, hard temper
                                                                                                        • diameter > NPS 1                                               3.0
                                                                                                                                                                                                               None
                                                                                                        • diameter ≤ NPS 1                                               2.5
                                                                                                    Copper tube, soft temper                                             2.5                                   None
                                                                                                    CPVC pipe                                                            1.0                                   None
                                                                                                    Galvanized iron or steel pipe
                                                                                                        • diameter ≥ NPS 6                                               3.75
                                                                                                                                                                                                               None
                                                                                                        • diameter < NPS 6                                               2.5
                                                                                                    Lead pipe                                                  Throughout length of pipe                       None
                                                                                                    PE/AL/PE composite pipe                                              1.0                                   None
                                                                                                    PEX/AL/PEX composite pipe                                            1.0                                   None
                                                                                                    PEX plastic pipe                                                     0.8                                   None
                                                                                                    PE-RT tube                                                           0.8                                   None
                                                                                                                                                                                             At the end of branches and at changes in
                                                                                                    PP-R plastic pipe                                                    1.0
                                                                                                                                                                                                      direction and elevation
                                                                                                    Stainless steel pipe
                                                                                                        • diameter ≥ NPS 1                                               3.0
                                                                                                                                                                                                               None
                                                                                                        • diameter < NPS 1                                               2.5
                                                                                                    Stainless steel tube
                                                                                                        • diameter ≥ NPS 1                                               3.0
                                                                                                                                                                                                               None
                                                                                                        • diameter < NPS 1                                               2.5


                                                                                                                              5) Where hangers are used to support nominally horizontal piping, the hangers
                                                                                                                           shall be
                                                                                                                              a) supported by metal rods of not less than
                                                                                                                                      i) 6 mm diam to support piping of NPS 2 or less,
                                                                                                                                     ii) 8 mm diam to support piping of NPS 4 or less, and
                                                                                                                                    iii) 13 mm diam to support piping over NPS 4, or
                                                                                                                              b) solid or perforated metal straps not less than
                                                                                                                                      i) 0.6 mm thick and 12 mm wide to support piping of NPS 2
                                                                                                                                         or less, and
                                                                                                                                     ii) 0.8 mm thick and 18 mm wide to support piping of NPS 4
                                                                                                                                         or less.

                                                                                                                              6) Where a hanger is attached to concrete or masonry, it shall be fastened by metal
                                                                                                                           or expansion-type plugs that are inserted or built into the concrete or masonry.




                                                                                                    2-20 Division B                                                                               National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                               2.3.6.1.

                                                                                                    2.3.4.6.         Support for Underground Horizontal Piping
                                                                                                                         1) Except as provided in Sentence (2), nominally horizontal piping that is
                                                                                                                     underground shall be supported on a base that is firm and continuous under the whole
                                                                                                                     of the pipe. (See Note A-2.3.4.6.(1).)
                                                                                                                        2) Nominally horizontal piping installed underground that is not supported as
                                                                                                                     described in Sentence (1) may be installed using hangers fixed to a foundation or
                                                                                                                     structural slab provided that the hangers are capable of
                                                                                                                         a) keeping the pipe in alignment, and
                                                                                                                         b) supporting the weight of
                                                                                                                                i) the pipe,
                                                                                                                               ii) its contents, and




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                              iii) the fill over the pipe.

                                                                                                    2.3.4.7.         Support for Vent Pipe above a Roof
                                                                                                                        1) Where a vent pipe that may be subject to misalignment terminates above the
                                                                                                                     surface of a roof, it shall be supported or braced. (See Article 2.5.6.5. for location of
                                                                                                                     vent pipe terminals.)

                                                                                                    2.3.5.           Protection of Piping
                                                                                                    2.3.5.1.         Protection of Piping
                                                                                                                        1) Underground piping shall be protected
                                                                                                                        a) in the absence of the pipe manufacturer's instructions for backfill, by backfill
                                                                                                                           that is (see Note A-2.3.5.1.(1)(a))
                                                                                                                              i) placed and compacted to a height of 300 mm over the top
                                                                                                                                 of the pipe, and
                                                                                                                             ii) free of stones, boulders, cinders and frozen earth or other
                                                                                                                                 material capable of damaging the piping, or
                                                                                                                        b) by concrete that is at least 75 mm thick and at least 200 mm wider than
                                                                                                                           the pipe.

                                                                                                    2.3.5.2.         Isolation from Loads
                                                                                                                       1) Where piping passes through or under a wall, it shall be installed so that the
                                                                                                                     wall does not bear on the pipe.

                                                                                                    2.3.5.3.         Protection Against Freezing
                                                                                                                     (See Note A-2.3.5.3.)
                                                                                                                        1) Where piping may be exposed to freezing conditions, it shall be protected
                                                                                                                     from the effects of freezing.

                                                                                                    2.3.5.4.         Protection from Mechanical Damage
                                                                                                                        1) Plumbing, piping and equipment exposed to mechanical damage shall be
                                                                                                                     protected.

                                                                                                    2.3.5.5.         Protection from Condensation
                                                                                                                     (See Note A-2.3.5.3.)
                                                                                                                        1) Piping used as an internal leader, which may be subject to condensation, shall be
                                                                                                                     installed in a manner that limits the risk of damage to the building due to condensation.

                                                                                                    2.3.6.           Testing of Drainage or Venting Systems
                                                                                                    2.3.6.1.         Tests and Inspection of Drainage or Venting Systems
                                                                                                                        1) Except in the case of an external leader, after a section of a drainage system or a
                                                                                                                     venting system has been roughed in, and before any fixture is installed or piping is
                                                                                                                     covered, a water pressure test or an air pressure test shall be conducted.


                                                                                                    National Plumbing Code of Canada 2020                                                                   Division B 2-21
                                                                                                    2.3.6.2.                                                                                             Division B

                                                                                                                         2) After every fixture is installed and before any part of the drainage system or
                                                                                                                      venting system is placed in operation, a final test shall be carried out when requested.
                                                                                                                         3) Where a prefabricated system is assembled off the building site in such a
                                                                                                                      manner that it cannot be inspected and tested on site, off-site inspections and tests
                                                                                                                      shall be conducted.
                                                                                                                         4) Where a prefabricated system is installed as part of a drainage system or venting
                                                                                                                      system, all other plumbing work shall be tested and inspected and a final test shall be
                                                                                                                      carried out on the complete system when requested.
                                                                                                                         5) When requested, a ball test shall be made to any pipe in a drainage system.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    2.3.6.2.          Tests of Pipes in Drainage Systems
                                                                                                                         1) Pipes in a drainage system, except an external leader or fixture outlet pipe, shall
                                                                                                                      be capable of withstanding without leakage a water pressure test, air pressure test
                                                                                                                      and final test.
                                                                                                                         2) Pipes in a drainage system shall be capable of meeting a ball test.

                                                                                                    2.3.6.3.          Tests of Venting Systems
                                                                                                                         1) Venting systems shall be capable of withstanding without leakage a water
                                                                                                                      pressure test, air pressure test and final test.

                                                                                                    2.3.6.4.          Water Pressure Tests
                                                                                                                          1) A water pressure test shall consist in applying a water column of at least 3 m to
                                                                                                                      all joints.
                                                                                                                         2) In making a water pressure test,
                                                                                                                         a) every opening except the highest shall be tightly closed with a testing plug
                                                                                                                            or a screw cap, and
                                                                                                                         b) the system or the section shall be kept filled with water for 15 min.

                                                                                                    2.3.6.5.          Air Pressure Tests
                                                                                                                         1) Air pressure tests shall be conducted in accordance with the manufacturer's
                                                                                                                      instructions for each piping material, and
                                                                                                                          a) air shall be forced into the system until a pressure of 35 kPa is created, and
                                                                                                                          b) this pressure shall be maintained for at least 15 min without a drop in
                                                                                                                             pressure.
                                                                                                                      (See Note A-2.3.6.5.(1).)

                                                                                                    2.3.6.6.          Final Tests
                                                                                                                         1) Where a final test is made,
                                                                                                                         a) every trap shall be filled with water,
                                                                                                                         b) the bottom of the system being tested shall terminate at a building trap, test
                                                                                                                            plug or cap,
                                                                                                                         c) except as provided in Sentence (2), smoke from smoke-generating machines
                                                                                                                            shall be forced into the system,
                                                                                                                         d) when the smoke appears from all roof terminals, they shall be closed, and
                                                                                                                         e) a pressure equivalent to a 25 mm water column shall be maintained for
                                                                                                                            15 min without the addition of more smoke.
                                                                                                                         2) The smoke referred to in Clauses (1)(c) and (d) is permitted to be omitted,
                                                                                                                      provided the roof terminals are closed and the system is subjected to an air pressure
                                                                                                                      equivalent to a 25 mm water column maintained for 15 min without the addition of
                                                                                                                      more air.

                                                                                                    2.3.6.7.          Ball Tests
                                                                                                                         1) Where a ball test is made, a hard ball dense enough not to float shall be rolled
                                                                                                                      through the pipe.


                                                                                                    2-22 Division B                                                                   National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                2.4.2.1.

                                                                                                                        2) The diameter of the ball shall be not less than
                                                                                                                        a) 50 mm where the size of the pipe is NPS 3 or more, or
                                                                                                                        b) 25 mm where the size of the pipe is less than NPS 3.

                                                                                                    2.3.7.           Testing of Potable Water Systems
                                                                                                    2.3.7.1.         Application of Tests
                                                                                                                         1) After a section of a potable water system has been completed, and before it
                                                                                                                     is placed in operation, a water pressure test shall be conducted, except that an air
                                                                                                                     pressure test may be used in freezing conditions.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                        2) A pressure test may be applied to each section of the system or to the system as
                                                                                                                     a whole.
                                                                                                                        3) Where a prefabricated system is assembled off the building site in such a manner
                                                                                                                     that it cannot be inspected and tested on site, off-site inspections and pressure tests
                                                                                                                     shall be conducted.
                                                                                                                        4) Where a prefabricated system is installed as part of a water system,
                                                                                                                        a) all other plumbing work shall be tested and inspected, and
                                                                                                                        b) the complete system shall be pressure tested when requested.

                                                                                                    2.3.7.2.         Pressure Tests of Potable Water Systems
                                                                                                                        1) Except as required in Sentence (2), potable water systems shall be able to
                                                                                                                     withstand
                                                                                                                        a) without leaking, a water pressure that is at least equal to the maximum
                                                                                                                            in-service pressure, or
                                                                                                                        b) an air pressure of not less than 700 kPa for at least 2 h without a drop in
                                                                                                                            pressure.
                                                                                                                        2) If a manufacturer states that an air pressure test is not recommended, a water
                                                                                                                     pressure test shall be performed. (See Note A-2.3.7.2.(2).)

                                                                                                    2.3.7.3.         Water Pressure Tests
                                                                                                                        1) Where a water pressure test is made, all air shall be expelled from the system
                                                                                                                     before fixture control valves or faucets are closed.
                                                                                                                        2) Potable water shall be used to test a potable water system.


                                                                                                    Section 2.4. Drainage Systems
                                                                                                    2.4.1.           Application
                                                                                                    2.4.1.1.         General
                                                                                                                        1) This Section applies to sanitary drainage systems, storm drainage systems, combined
                                                                                                                     building drains or combined building sewers.

                                                                                                    2.4.2.           Connections to Drainage Systems
                                                                                                    2.4.2.1.         Connections to Sanitary Drainage Systems
                                                                                                                        1) Fixtures shall be directly connected to a sanitary drainage system, except that
                                                                                                                        a) drinking fountains are permitted to be
                                                                                                                              i) indirectly connected to a sanitary drainage system, or
                                                                                                                             ii) connected to a storm drainage system, provided that where
                                                                                                                                 the system is subject to backflow, a backwater valve is installed
                                                                                                                                 in the fountain fixture drain (see Note A-2.4.2.1.(1)(a)(ii)
                                                                                                                                 and (e)(vi)),


                                                                                                    National Plumbing Code of Canada 2020                                                                    Division B 2-23
                                                                                                    2.4.2.2.                                                                                              Division B

                                                                                                                         b) drainage pans on heating/cooling units are permitted to be connected to a
                                                                                                                            storm drainage system, provided that where the system is subject to backflow,
                                                                                                                            a backwater valve is installed,
                                                                                                                         c) a floor drain is permitted to be connected to a storm drainage system, provided
                                                                                                                            it is located where it can receive only clear-water waste or storm water,
                                                                                                                         d) fixtures or appliances that discharge only clear-water waste are permitted to
                                                                                                                            be connected to a storm drainage system or be drained onto a roof, and
                                                                                                                         e) the following devices shall be indirectly connected to a drainage system:
                                                                                                                                i) a device for the display, storage, preparation or processing
                                                                                                                                   of food or drink,
                                                                                                                               ii) a sterilizer,
                                                                                                                              iii) a device that uses water as a cooling or heating medium,




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                              iv) a water operated device,
                                                                                                                               v) a water treatment device, or
                                                                                                                              vi) a drain or overflow from a water system or a heating system
                                                                                                                                   (see Note A-2.4.2.1.(1)(a)(ii) and (e)(vi)).

                                                                                                                         2) The connection of a sanitary drainage pipe to a nominally horizontal sanitary
                                                                                                                      drainage pipe or to a nominally horizontal offset in a stack shall be not less than 1.5 m
                                                                                                                      measured horizontally from the bottom of a stack or from the bottom of the upper
                                                                                                                      vertical section of the stack that
                                                                                                                          a) receives a discharge of 30 or more fixture units, or
                                                                                                                          b) receives a discharge from fixtures located on 2 or more storeys.
                                                                                                                      (See Note A-2.4.2.1.(2).)

                                                                                                                         3) No other fixture shall be connected to a lead bend or stub that serves a water
                                                                                                                      closet.

                                                                                                                         4) Where a change in direction of more than 45° occurs in a sanitary drainage pipe
                                                                                                                      that serves more than one clothes washer, and in which pressure zones are created by
                                                                                                                      detergent suds, no other sanitary drainage pipe shall be connected to it within a length
                                                                                                                      less than
                                                                                                                          a) 40 times the nominal pipe size of the sanitary drainage pipe or 2.44 m maximum
                                                                                                                              vertical, whichever is less, before changing direction, and
                                                                                                                          b) 10 times the nominal pipe size of the nominally horizontal sanitary drainage
                                                                                                                              pipe after changing direction.
                                                                                                                      (See Note A-2.4.2.1.(4) and (5).)

                                                                                                                         5) Where a vent pipe is connected into the suds pressure zone referred to in
                                                                                                                      Sentence (4), no other vent pipe shall be connected to that vent pipe within the height of
                                                                                                                      the suds pressure zone. (See Note A-2.4.2.1.(4) and (5).)

                                                                                                    2.4.2.2.          Connection of Overflows from Rainwater Tanks

                                                                                                                         1) An overflow from a rainwater tank shall not be directly connected to a drainage
                                                                                                                      system.

                                                                                                    2.4.2.3.          Direct Connections

                                                                                                                          1) Two or more fixture outlet pipes that serve outlets from a single fixture that is
                                                                                                                      listed in Clause 2.4.2.1.(1)(e) are permitted to be directly connected to a branch that
                                                                                                                          a) has a nominal pipe size of not less than NPS 1¼, and
                                                                                                                          b) is terminated above the flood level rim of a directly connected fixture to form
                                                                                                                              an air break.

                                                                                                                         2) Fixture drains from fixtures that are listed in Subclauses 2.4.2.1.(1)(e)(i) and (e)(ii)
                                                                                                                      are permitted to be directly connected to a pipe that
                                                                                                                          a) is terminated to form an air break above the flood level rim of a fixture that is
                                                                                                                             directly connected to a sanitary drainage system, and
                                                                                                                          b) is extended through the roof when fixtures on 3 or more storeys are connected
                                                                                                                             to it (see Note A-2.4.2.1.(1)(a)(ii) and (e)(vi)).


                                                                                                    2-24 Division B                                                                    National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                 2.4.4.3.

                                                                                                                        3) Fixture drains from fixtures that are listed in Subclauses 2.4.2.1.(1)(e)(iii) to (e)(vi)
                                                                                                                     are permitted to be directly connected to a pipe that
                                                                                                                         a) is terminated to form an air break above the flood level rim of a fixture that is
                                                                                                                            directly connected to a storm drainage system, and
                                                                                                                         b) is extended through the roof when fixtures on 3 or more storeys are connected
                                                                                                                            to it.

                                                                                                    2.4.3.           Location of Fixtures
                                                                                                    2.4.3.1.         Urinals
                                                                                                                        1) Urinals shall not be installed adjacent to wall and floor surfaces that are




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                     pervious to water. (See Article 3.7.2.5. of Division B of the NBC.)

                                                                                                    2.4.3.2.         Restricted Locations of Indirect Connections and Traps
                                                                                                                        1) Indirect connections or any trap that may overflow shall not be located in a
                                                                                                                     crawl space or any other unfrequented area.

                                                                                                    2.4.3.3.         Equipment Restrictions Upstream of Grease Interceptors
                                                                                                                        1) Except as provided in Sentence (2), equipment discharging waste with organic
                                                                                                                     solids shall not be located upstream of a grease interceptor. (See Note A-2.4.3.3.(1).)
                                                                                                                        2) An organic solids interceptor is permitted to be installed upstream of a grease
                                                                                                                     interceptor.

                                                                                                    2.4.3.4.         Fixtures Located in Chemical Storage Locations
                                                                                                                        1) A floor drain or other fixture located in an oil transformer vault, a high voltage
                                                                                                                     room or any room where flammable, dangerous or toxic chemicals are stored or
                                                                                                                     handled shall not be connected to a drainage system.

                                                                                                    2.4.3.5.         Macerating Toilet Systems
                                                                                                                        1) A macerating toilet system shall only be installed where no connection to a
                                                                                                                     gravity sanitary drainage system is available.

                                                                                                    2.4.3.6.         Drains Serving Elevator Pits
                                                                                                                        1) Where a drain is provided in an elevator pit,
                                                                                                                        a) it shall be connected directly to a sump located outside the elevator pit, and
                                                                                                                        b) the drain pipe that connects the sump to the drainage system shall have a
                                                                                                                           backwater valve.

                                                                                                    2.4.4.           Treatment of Sewage and Waste
                                                                                                    2.4.4.1.         Sewage Treatment
                                                                                                                        1) Where a fixture or equipment discharges sewage or waste that may damage
                                                                                                                     or impair the sanitary drainage system or the functioning of a public or private sewage
                                                                                                                     disposal system, provision shall be made for treatment of the sewage or waste before it is
                                                                                                                     discharged to the sanitary drainage system.

                                                                                                    2.4.4.2.         Cooling of Hot Water or Sewage
                                                                                                                        1) Where a fixture discharges sewage or clear-water waste that is at a temperature
                                                                                                                     above 75°C, provision shall be made for cooling of the waste to 75°C or less before it is
                                                                                                                     discharged to the drainage system.

                                                                                                    2.4.4.3.         Interceptors
                                                                                                                        1) Where a fixture discharges sewage that includes fats, oils or grease and is located
                                                                                                                     in a public kitchen, in a restaurant or in a care or detention occupancy, it shall discharge
                                                                                                                     through a grease interceptor. (See Note A-2.4.4.3.(1).)


                                                                                                    National Plumbing Code of Canada 2020                                                                     Division B 2-25
                                                                                                    2.4.4.4.                                                                                           Division B

                                                                                                                         2) Where the discharge from a fixture may contain oil or gasoline, an oil interceptor
                                                                                                                      shall be installed. (See Article 2.5.5.2. for venting requirements for oil interceptors.)
                                                                                                                         3) Where a fixture discharges sand, grit or similar materials, an interceptor designed
                                                                                                                      for the purpose of trapping such discharges shall be installed.
                                                                                                                          4) Interceptors shall have sufficient capacity to perform the service for which
                                                                                                                      it is provided.

                                                                                                    2.4.4.4.          Neutralizing and Dilution Tanks
                                                                                                                         1) Where a fixture or equipment discharges corrosive or acid waste, it shall




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                      discharge into a neutralizing or dilution tank that is connected to the sanitary drainage
                                                                                                                      system through
                                                                                                                          a) a trap, or
                                                                                                                          b) an indirect connection.
                                                                                                                      (See Note A-2.4.4.4.(1).)
                                                                                                                         2) Neutralizing and dilution tanks shall have a method for neutralizing the liquid.

                                                                                                    2.4.5.            Traps
                                                                                                    2.4.5.1.          Traps for Sanitary Drainage Systems
                                                                                                                         1) Except as provided in Sentences (2) to (5) and in Article 2.4.5.2., fixtures shall
                                                                                                                      be protected by a separate trap.
                                                                                                                         2) One trap is permitted to protect
                                                                                                                         a) all the trays or compartments of a 2- or 3-compartment sink,
                                                                                                                         b) a 2-compartment laundry tray, or
                                                                                                                          c) 2 similar single compartment fixtures located in the same room.
                                                                                                                      (See Note A-2.4.5.1.(2).)
                                                                                                                         3) One trap is permitted to serve a group of floor drains or shower drains, a group
                                                                                                                      of washing machines or a group of laboratory sinks if the fixtures
                                                                                                                          a) are in the same room, and
                                                                                                                         b) are not located where they can receive food or other organic matter.
                                                                                                                      (See Note A-2.4.5.1.(3).)
                                                                                                                         4) An indirectly connected fixture that can discharge only clear-water waste other
                                                                                                                      than a drinking fountain need not be protected by a trap. (See Clause 2.4.2.1.(1)(e)
                                                                                                                      for indirect connections.)
                                                                                                                         5) An interceptor with an effective water seal of not less than 38 mm is permitted to
                                                                                                                      serve as a trap. (See Note A-2.4.5.1.(5).)
                                                                                                                         6) Where a domestic dishwashing machine equipped with a drainage pump
                                                                                                                      discharges through a direct connection into the fixture outlet pipe of an adjacent kitchen
                                                                                                                      sink or disposal unit, the pump discharge line shall rise as high as possible to just
                                                                                                                      under the counter and connect
                                                                                                                          a) on the inlet side of the sink trap by means of a Y fitting, or
                                                                                                                         b) to the disposal unit.

                                                                                                    2.4.5.2.          Traps for Storm Drainage Systems
                                                                                                                          1) Where a storm drainage system is connected to a combined building sewer or a
                                                                                                                      public combined sewer, a trap shall be installed between any opening in the system and
                                                                                                                      the drain or sewer, except that no trap is required if the opening is the upper end of
                                                                                                                      a leader that terminates
                                                                                                                          a) at a roof that is used only for weather protection,
                                                                                                                          b) not less than 1 m above or not less than 3.5 m in any other direction from
                                                                                                                              any air inlet, openable window or door, and
                                                                                                                          c) not less than 1.8 m from a property line.
                                                                                                                      (See Note A-2.4.5.2.(1).)


                                                                                                    2-26 Division B                                                                  National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                               2.4.6.3.

                                                                                                                        2) A floor drain that drains to a storm drainage system shall be protected by a
                                                                                                                     trap that
                                                                                                                         a) is located between the floor drain and a leader, storm building drain or storm
                                                                                                                             building sewer,
                                                                                                                         b) may serve all floor drains located in the same room, and
                                                                                                                         c) need not be protected by a vent pipe.
                                                                                                                         3) Where freezing conditions could cause storm drainage systems to freeze due to
                                                                                                                     air circulation within the piping, a trap with a cleanout shall be installed in a heated
                                                                                                                     location.

                                                                                                    2.4.5.3.         Connection of Subsoil Drainage Pipe to a Sanitary Drainage System




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                        1) Where a subsoil drainage pipe is connected to a sanitary drainage system, the
                                                                                                                     connection shall be made on the upstream side of a trap with a cleanout or a trapped
                                                                                                                     sump. (See Note A-2.4.5.3.(1).)

                                                                                                    2.4.5.4.         Location and Cleanout for Building Traps
                                                                                                                        1) Where a building trap is installed, it shall
                                                                                                                         a) be provided with a cleanout fitting on the upstream side of and directly
                                                                                                                            over the trap,
                                                                                                                        b) be located upstream of the building cleanout, and
                                                                                                                         c) be located
                                                                                                                               i) inside the building as close as practical to the place where
                                                                                                                                  the building drain leaves the building, or
                                                                                                                              ii) outside the building in a manhole.
                                                                                                                     (See Note A-2.4.5.4.(1).)

                                                                                                    2.4.5.5.         Trap Seals
                                                                                                                        1) Provision shall be made for maintaining the trap seal of a floor drain by
                                                                                                                        a) the use of a trap seal primer,
                                                                                                                        b) using the drain as a receptacle for an indirectly connected drinking fountain,
                                                                                                                            or
                                                                                                                         c) other equally effective means.
                                                                                                                     (See Note A-2.4.5.5.(1).)

                                                                                                    2.4.6.           Arrangement of Drainage Piping
                                                                                                    2.4.6.1.         Separate Systems
                                                                                                                        1) No vertical sanitary drainage pipe shall conduct both sewage and storm water.
                                                                                                                        2) A combined building drain shall not be installed. (See Note A-2.1.2.1.(2).)
                                                                                                                        3) There shall be no unused open ends in a drainage system and dead ends shall be
                                                                                                                     so graded that water will not collect in them.

                                                                                                    2.4.6.2.         Location of Sanitary Drainage Pipes
                                                                                                                        1)   A sanitary drainage pipe shall not be located directly above
                                                                                                                        a)   non-pressure potable water storage tanks,
                                                                                                                        b)   manholes in pressure potable water storage tanks, or
                                                                                                                        c)   food-handling or food-processing equipment.

                                                                                                    2.4.6.3.         Sumps or Tanks
                                                                                                                     (See Note A-2.4.6.3.)
                                                                                                                        1) Piping that is too low to drain into a building sewer by gravity shall be drained to
                                                                                                                     a sump or receiving tank.
                                                                                                                        2) Where the sump or tank receives sewage, it shall be water- and air-tight and
                                                                                                                     shall be vented.


                                                                                                    National Plumbing Code of Canada 2020                                                                 Division B 2-27
                                                                                                    2.4.6.4.                                                                                               Division B

                                                                                                                         3) Where the sump or tank receives subsurface water from a subsoil drainage pipe, it
                                                                                                                      shall be provided with a water- and air-tight cover.
                                                                                                                         4) Equipment such as a pump or ejector that can lift the contents of the sump or
                                                                                                                      tank and discharge it into the building drain or building sewer shall be installed.
                                                                                                                         5) Where the equipment does not operate automatically, the capacity of the sump
                                                                                                                      shall be sufficient to hold at least a 24 h accumulation of liquid.
                                                                                                                         6) Where there is a building trap, the discharge pipe from the equipment shall be
                                                                                                                      connected to the building drain downstream of the trap.
                                                                                                                         7) The discharge pipe from every pumped sump shall be equipped with a union,
                                                                                                                      a backwater valve and a shut-off valve installed in that sequence in the direction of




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                      discharge.
                                                                                                                         8) The discharge piping from a pump or ejector shall be sized for optimum flow
                                                                                                                      velocities at pump design conditions.

                                                                                                    2.4.6.4.          Protection from Backflow
                                                                                                                         1) Except as provided in Sentences (2) and (3), where a building drain or a branch
                                                                                                                      may be subject to backflow, a backwater valve shall be installed on every fixture drain
                                                                                                                      connected to them when the fixture is located below the level of the adjoining street.
                                                                                                                        2) Where more than one fixture is located on a storey and all are connected to the
                                                                                                                      same branch, the backwater valve is permitted to be installed on the branch.
                                                                                                                         3) A subsoil drainage pipe that drains into a sanitary drainage system that is subject
                                                                                                                      to surcharge shall be connected in such a manner that sewage cannot back up into the
                                                                                                                      subsoil drainage pipe. (See Note A-2.4.6.4.(3).)
                                                                                                                         4) Except as permitted in Sentence (5), a backwater valve or a gate valve that would
                                                                                                                      prevent the free circulation of air shall not be installed in a building drain or in a building
                                                                                                                      sewer.
                                                                                                                         5) A backwater valve is permitted to be installed in a building drain, provided that
                                                                                                                         a) it is a “normally open” design conforming to
                                                                                                                                i) CSA B70, “Cast iron soil pipe, fittings, and means of
                                                                                                                                   joining,”
                                                                                                                               ii) CSA B181.1, “Acrylonitrile-butadiene-styrene (ABS) drain,
                                                                                                                                   waste, and vent pipe and pipe fittings,”
                                                                                                                              iii) CSA B181.2, “Polyvinylchloride (PVC) and chlorinated
                                                                                                                                   polyvinylchloride (CPVC) drain, waste, and vent pipe and
                                                                                                                                   pipe fittings,” or
                                                                                                                              iv) CSA B182.1, “Plastic drain and sewer pipe and pipe
                                                                                                                                   fittings,” and
                                                                                                                         b) it does not serve more than one dwelling unit.

                                                                                                    2.4.6.5.          Mobile Home Sewer Service
                                                                                                                         1) A building sewer intended to serve a mobile home shall be
                                                                                                                         a) not less than NPS 4,
                                                                                                                         b) terminated above ground,
                                                                                                                         c) provided with
                                                                                                                                i) a tamperproof terminal connection that is capable of being
                                                                                                                                   repeatedly connected, disconnected and sealed,
                                                                                                                               ii) a protective concrete pad, and
                                                                                                                              iii) a means to protect it from frost heave, and
                                                                                                                         d) designed and constructed in accordance with good engineering practice.

                                                                                                    2.4.7.            Cleanouts
                                                                                                    2.4.7.1.          Cleanouts for Drainage Systems
                                                                                                                          1) Sanitary drainage systems and storm drainage systems shall be provided with
                                                                                                                      cleanouts that will permit cleaning of the entire system.


                                                                                                    2-28 Division B                                                                     National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                    2.4.7.2.

                                                                                                                          2) A cleanout fitting shall be provided on the upstream side and directly over
                                                                                                                       every running trap.
                                                                                                                          3) Internal leaders shall be provided with a cleanout fitting at the bottom of the
                                                                                                                       leader or not more than 3 m upstream from the bottom of the leader.
                                                                                                                         4) Where a cleanout is required on a building sewer of NPS 8 or larger, it shall be a
                                                                                                                       manhole.
                                                                                                                          5) A building sewer shall not change direction or slope between the building and
                                                                                                                       public sewer or between cleanouts, except that pipes not more than NPS 6 may change
                                                                                                                       direction
                                                                                                                           a) by not more than 5° every 3 m, or




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                          b) by the use of fittings with a cumulative change in direction of not more
                                                                                                                               than 45°.
                                                                                                                          6) Building drains shall be provided with a cleanout fitting of NPS 4 or larger that is
                                                                                                                       located as close as practical to the place where the building drain leaves the building.
                                                                                                                       (See Note A-2.4.7.1.(6).)
                                                                                                                             7)   Stacks shall be provided with a cleanout fitting
                                                                                                                             a)   at the bottom of the stack,
                                                                                                                             b)   not more than 3 m upstream of the bottom of the stack, or
                                                                                                                             c)   on a Y fitting connecting the stack to the building drain or branch.
                                                                                                                          8) A cleanout shall be provided to permit the cleaning of the piping downstream of
                                                                                                                       an interceptor.
                                                                                                                          9) Cleanouts shall be installed so that the cumulative change in direction is not
                                                                                                                       more than 90° between cleanouts in a drip pipe from a food receptacle or in a fixture
                                                                                                                       drain serving a kitchen sink in a non-residential occupancy. (See Note A-2.4.7.1.(9).)
                                                                                                                        10) A fixture outlet pipe, a trap with a removable trap dip, or a separate cleanout shall
                                                                                                                       be used as a cleanout for a fixture drain. (See Note A-2.4.7.1.(10).)
                                                                                                                        11) Building drains shall be provided with an additional cleanout for each cumulative
                                                                                                                       horizontal change in direction exceeding 135°.

                                                                                                    2.4.7.2.           Size and Spacing of Cleanouts
                                                                                                                          1) Except as provided in Sentences (2), (3) and 2.4.7.1.(6), the nominal pipe size and
                                                                                                                       spacing of cleanouts in nominally horizontal pipes of a drainage system shall conform to
                                                                                                                       Table 2.4.7.2.

                                                                                                                                                               Table 2.4.7.2.
                                                                                                                                                 Permitted Size and Spacing of Cleanouts
                                                                                                                                                    Forming Part of Sentence 2.4.7.2.(1)

                                                                                                      Nominal Pipe Size of Drainage         Minimum Nominal Pipe Size of                    Maximum Spacing, m
                                                                                                               Pipe, NPS                           Cleanout, NPS                One-Way Rodding            Two-Way Rodding
                                                                                                               less than 3                   Same NPS as drainage pipe                7.5                        15
                                                                                                                3 and 4                                 3                              15                        30
                                                                                                                 over 4                                 4                              26                        52


                                                                                                                             2) The spacing between manholes serving a building sewer
                                                                                                                             a) of NPS 24 or less shall not exceed 90 m, and
                                                                                                                             b) over NPS 24 shall not exceed 150 m.
                                                                                                                         3) The developed length of a building sewer between the building and the first
                                                                                                                       manhole to which the building sewer connects shall not exceed 75 m.
                                                                                                                          4) Where a building sewer connects to another building sewer other than by a
                                                                                                                       manhole, the developed length between the building and the building sewer to which it
                                                                                                                       connects shall not exceed 30 m.


                                                                                                    National Plumbing Code of Canada 2020                                                                        Division B 2-29
                                                                                                    2.4.7.3.                                                                                           Division B

                                                                                                                         5) Cleanouts that allow rodding in one direction only shall be installed to permit
                                                                                                                      rodding in the direction of flow.

                                                                                                    2.4.7.3.          Manholes
                                                                                                                        1) A manhole, including the cover, shall be designed to support all loads imposed
                                                                                                                      upon it.
                                                                                                                         2) A manhole shall be provided with
                                                                                                                         a) a cover that provides an airtight seal if located within a building,
                                                                                                                         b) a rigid ladder of a corrosion-resistant material where the depth exceeds
                                                                                                                            1 m, and
                                                                                                                         c) a vent to the exterior if the manhole is located within a building.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                         3) A manhole shall have a minimum horizontal dimension of 1 m, except that the
                                                                                                                      top 1.5 m may be tapered from 1 m down to a minimum of 600 mm at the top.
                                                                                                                          4) A manhole in a sanitary drainage system shall be channeled to direct the flow of
                                                                                                                      effluent.

                                                                                                    2.4.7.4.          Location of Cleanouts
                                                                                                                         1) Cleanouts and access covers shall be located so that their openings are readily
                                                                                                                      accessible for drain cleaning purposes.
                                                                                                                         2) A cleanout shall not be
                                                                                                                         a) located in a floor assembly in a manner that may constitute a hazard, or
                                                                                                                         b) used as a floor drain.
                                                                                                                         3) There shall be no change of direction between a cleanout fitting and the trap
                                                                                                                      that it serves.
                                                                                                                         4) The piping between a cleanout fitting and the drainage system it serves shall
                                                                                                                      not change direction by more than 45°.
                                                                                                                         5) Cleanouts serving fixture drains in healthcare facilities, mortuaries, laboratories
                                                                                                                      and similar occupancies, where contamination by hazardous waste is likely, shall
                                                                                                                      be located a minimum of 150 mm above the flood level rim of the fixture. (See
                                                                                                                      Note A-2.4.4.4.(1).)

                                                                                                    2.4.8.            Minimum Slope and Length of Drainage Pipes
                                                                                                    2.4.8.1.          Minimum Slope
                                                                                                                         1) Except as provided in Articles 2.4.10.8. and 2.4.10.9., drainage pipes that are
                                                                                                                      NPS 3 or less shall have a downward slope in the direction of flow of at least 1 in 50.
                                                                                                                      (See Note A-2.4.8.1.(1).)

                                                                                                    2.4.8.2.          Length of Fixture Outlet Pipes
                                                                                                                         1) Except for fixture outlet pipes installed in conformance with Sentence 2.4.5.1.(3),
                                                                                                                      the developed length of fixture outlet pipes shall not exceed 1 200 mm. (See
                                                                                                                      Note A-2.4.8.2.(1).) (See also Note A-2.4.5.1.(2).)

                                                                                                    2.4.9.            Size of Drainage Pipes
                                                                                                    2.4.9.1.          No Reduction in Size
                                                                                                                         1) A sanitary drainage pipe shall be of a nominal pipe size not less than the NPS of
                                                                                                                         a) a vent pipe that is connected to it, or
                                                                                                                         b) the largest sanitary drainage pipe that drains into it.

                                                                                                    2.4.9.2.          Serving Water Closets
                                                                                                                         1) Drainage pipes that serve a water closet shall be not less than NPS 3.
                                                                                                                         2) Branch and building drains downstream of the third water-closet fixture drain
                                                                                                                      connection shall be not less than NPS 4.


                                                                                                    2-30 Division B                                                                  National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                                  2.4.9.3.

                                                                                                                               3) Stacks that serve more than 6 water closets shall be not less than NPS 4.
                                                                                                                               4) Discharge pipes serving a macerating toilet system shall be not less than NPS ¾.

                                                                                                    2.4.9.3.                Size of Fixture Outlet Pipes
                                                                                                                               1) Except as provided in Sentence (2), the nominal pipe size of fixture outlet pipes
                                                                                                                            shall conform to Table 2.4.9.3.
                                                                                                                               2) The part of the fixture outlet pipe that is common to 3 compartments of a sink
                                                                                                                            shall be one NPS larger than the largest fixture outlet pipe of the compartments that it
                                                                                                                            serves. (See Note A-2.4.9.3.(2).)




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                 Table 2.4.9.3.
                                                                                                                                Minimum Permitted Size of Fixture Outlet Pipe and Hydraulic Loads for Fixtures (1)
                                                                                                                                            Forming Part of Sentences 2.4.9.3.(1) and 2.4.10.2.(1)

                                                                                                                                                             Minimum Nominal Pipe Size of
                                                                                                                               Fixture                                                               Hydraulic Load, fixture units
                                                                                                                                                               Fixture Outlet Pipe, NPS
                                                                                                    Autopsy table                                                        1½                                       2
                                                                                                    Bathroom group
                                                                                                         (a) with flush tank                                             n/a                                      6
                                                                                                         (b) with direct flush valve                                     n/a                                      8
                                                                                                    Bathtub (with or without shower)                                     1½                                      1½
                                                                                                    Bath: foot, sitz or slab                                             1½                                      1½
                                                                                                    Beer cabinet                                                         1½                                      1½
                                                                                                    Bidet                                                                1¼                                       1
                                                                                                    Clothes washer
                                                                                                         (a) domestic (1)                                                n/a                                      2
                                                                                                         (b) commercial                                                  n/a                                      2
                                                                                                    Dental unit or cuspidor                                              1¼                                       1
                                                                                                    Dishwasher
                                                                                                                                                                                            1½ no load when connected to garbage grinder
                                                                                                         (a) domestic type                                               1½
                                                                                                                                                                                                         or domestic sink
                                                                                                         (b) commercial type                                              2                                       3
                                                                                                    Drinking fountain                                                    1¼                                       ½
                                                                                                    Floor drain (2)                                                       2                               2 with NPS 2 trap
                                                                                                                                                                                                          3 with NPS 3 trap
                                                                                                    Garbage grinder, commercial type                                      2                                       3
                                                                                                    Icebox                                                               1¼                                       1
                                                                                                    Laundry tray
                                                                                                         (a) single or double units or 2 single units with
                                                                                                                                                                         1½                                      1½
                                                                                                         common trap
                                                                                                         (b) 3 compartments                                              1½                                       2
                                                                                                    Lavatory
                                                                                                         (a) barber or beauty parlor                                     1½                                      1½
                                                                                                         (b) dental                                                      1¼                                       1
                                                                                                         (c) domestic type, single or                                    1¼                              1 with NPS 1¼ trap
                                                                                                             2 single with common trap                                                                  1½ with NPS 1½ trap
                                                                                                         (d) multiple or industrial type                                 1½                          according to Table 2.4.10.2.
                                                                                                    Macerating toilet system                                              ¾                                       4
                                                                                                    Potato peeler                                                         2                                       3


                                                                                                    National Plumbing Code of Canada 2020                                                                                     Division B 2-31
                                                                                                    2.4.9.4.                                                                                                           Division B

                                                                                                                                                                 Table 2.4.9.3. (Continued)

                                                                                                                                                                 Minimum Nominal Pipe Size of
                                                                                                                                 Fixture                                                          Hydraulic Load, fixture units
                                                                                                                                                                   Fixture Outlet Pipe, NPS
                                                                                                     Shower drain
                                                                                                           Total volume of discharge from all shower heads
                                                                                                           and body sprays:
                                                                                                              (a) < 9.5 LPM                                                  1½                               1½
                                                                                                              (b) 9.5 LPM to 20 LPM                                           2                                3
                                                                                                              (c) > 20 LPM                                                    3                                6




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                     Sink
                                                                                                           (a) domestic and other small types with or without
                                                                                                           garbage grinders, single, double or 2 single with a               1½                               1½
                                                                                                           common trap
                                                                                                           (b) Other sinks                                                   1½                      1½ with NPS 1½ trap
                                                                                                                                                                                                       2 with NPS 2 trap
                                                                                                                                                                                                       3 with NPS 3 trap
                                                                                                     Urinal
                                                                                                           (a) pedestal, siphon-jet or blowout type                           2                                4
                                                                                                           (b) stall, washout type                                            2                                2
                                                                                                           (c) wall
                                                                                                              (i) washout type                                               1½                               1½
                                                                                                              (ii) other types                                                2                                3
                                                                                                     Water closet
                                                                                                           (a) with flush tank                                                3                                4
                                                                                                           (b) with direct flush valve                                        3                                6

                                                                                                    Notes to Table 2.4.9.3.:
                                                                                                    (1)   See Note A-Table 2.4.9.3.
                                                                                                    (2)   No hydraulic load for emergency floor drains.


                                                                                                                                3) Where clothes washers do not drain to a laundry tray, the trap inlet shall be not
                                                                                                                             less than NPS 2 and be fitted with a vertical standpipe that is not less than 600 mm long
                                                                                                                             measured from the trap weir and terminates above the flood level rim of the clothes
                                                                                                                             washer. (See Note A-2.4.9.3.(3).)

                                                                                                    2.4.9.4.                 Size of Building Drain and Building Sewer

                                                                                                                               1) Building drains and building sewers connected to the public sewer system
                                                                                                                             downstream of the main cleanout (see Sentence 2.4.7.1.(6)) shall be not less than NPS 4.

                                                                                                    2.4.9.5.                 Offset in Leaders

                                                                                                                                1) No change in the nominal pipe size of a leader with a nominally horizontal offset is
                                                                                                                             required if the offset
                                                                                                                                a) is located immediately under the roof,
                                                                                                                                b) is not more than 6 m long, and
                                                                                                                                c) has a slope of not less than 1 in 50.

                                                                                                                                2) If the horizontal offset is more than 6 m long, the leader shall conform to
                                                                                                                             Table 2.4.10.9.




                                                                                                    2-32 Division B                                                                             National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                           2.4.10.4.

                                                                                                    2.4.10.          Hydraulic Loads
                                                                                                                     (See Note A-2.4.10. for determination of hydraulic loads and nominal pipe sizes of drainage pipes.)

                                                                                                    2.4.10.1.        Total Load on a Pipe
                                                                                                                         1) The hydraulic load on a pipe is the total load from
                                                                                                                         a) every fixture that is connected to the system upstream of the pipe,
                                                                                                                         b) every fixture for which provision is made for future connection upstream
                                                                                                                            of the pipe, and
                                                                                                                         c) all roofs and paved surfaces that drain into the system upstream of the pipe.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    2.4.10.2.        Hydraulic Loads for Fixtures
                                                                                                                         1) The hydraulic load from a fixture that is listed in Table 2.4.9.3. is the number of
                                                                                                                     fixture units set forth in the Table.
                                                                                                                         2) Except as provided in Sentence (1), the hydraulic load from a fixture that is not
                                                                                                                     listed in Table 2.4.9.3. is the number of fixture units set forth in Table 2.4.10.2. for the
                                                                                                                     nominal pipe size of the trap that serves the fixture.

                                                                                                                                                          Table 2.4.10.2.
                                                                                                                                   Permitted Hydraulic Load from a Fixture Based on Size of Trap
                                                                                                                                               Forming Part of Sentence 2.4.10.2.(2)

                                                                                                                    Nominal Pipe Size of Trap, NPS                                       Hydraulic Load, fixture units
                                                                                                                                 1¼                                                                   1
                                                                                                                                 1½                                                                   2
                                                                                                                                  2                                                                   3
                                                                                                                                  3                                                                   5
                                                                                                                                  4                                                                   6


                                                                                                    2.4.10.3.        Hydraulic Loads from Fixtures with a Continuous Flow
                                                                                                                        1) Except as provided in Sentence (2), the hydraulic load from a fixture that
                                                                                                                     produces a continuous flow, such as a pump or an air-conditioning fixture, is
                                                                                                                     31.7 fixture units for each litre per second of flow.
                                                                                                                        2) Where a fixture or equipment that produces a continuous or semi-continuous
                                                                                                                     flow drains to a combined sewer or to a storm sewer, the hydraulic load from the fixture is
                                                                                                                     900 L for each litre per second of flow.

                                                                                                    2.4.10.4.        Hydraulic Loads from Roofs or Paved Surfaces
                                                                                                                        1) Except as provided in Sentence (2), the hydraulic load in litres from a roof
                                                                                                                     or paved surface is the maximum 15 min rainfall determined in conformance with
                                                                                                                     Subsection 1.1.3. of Division B of the NBC, multiplied by the sum of
                                                                                                                         a) the area in square metres of the horizontal projection of the surface drained,
                                                                                                                            and
                                                                                                                        b) one-half the area in square metres of the largest adjoining vertical surface.
                                                                                                                     (See Note A-2.4.10.4.(1).)
                                                                                                                         2)   Flow control roof drains may be installed, provided
                                                                                                                         a)   the maximum drain down time does not exceed 24 h,
                                                                                                                         b)   the roof structure is designed to carry the load of the stored water,
                                                                                                                         c)   one or more scuppers are installed not more than 30 m apart along the
                                                                                                                              perimeter of the building so that
                                                                                                                                 i) up to 200% of the 15-minute rainfall intensity can be
                                                                                                                                    handled, and
                                                                                                                                ii) the maximum depth of controlled water is limited to
                                                                                                                                    150 mm,


                                                                                                    National Plumbing Code of Canada 2020                                                                                  Division B 2-33
                                                                                                    2.4.10.5.                                                                                                         Division B

                                                                                                                           d) they are located not more than 15 m from the edge of the roof and not more
                                                                                                                              than 30 m from adjacent drains, and
                                                                                                                           e) there is at least one drain for each 900 m2.

                                                                                                                          3) Hydraulic loads, in litres per second, for flow control roof drains and restricted
                                                                                                                       paved area drains shall be determined according to rain intensity-duration frequency
                                                                                                                       curves as compiled by Environment Canada using 25-year frequencies.

                                                                                                                          4) Where the height of the parapet is more than 150 mm or exceeds the height of
                                                                                                                       the adjacent wall flashing,
                                                                                                                           a) emergency roof overflows or scuppers described in Clause (2)(c) shall be
                                                                                                                              provided, and




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                          b) there shall be a minimum of 2 roof drains.

                                                                                                    2.4.10.5.          Conversion of Fixture Units to Litres

                                                                                                                          1) Except as provided in Sentence 2.4.10.3.(2), where the hydraulic load is to be
                                                                                                                       expressed in litres, fixture units shall be converted as follows:
                                                                                                                          a) when the number of fixture units is 260 or fewer, the load is 2 360 L, and
                                                                                                                          b) when the number of fixture units exceeds 260, the load is 9.1 L for each
                                                                                                                              fixture unit.

                                                                                                    2.4.10.6.          Hydraulic Loads to Sanitary Drainage Pipes

                                                                                                                          1) Except as provided in Sentence (2), the hydraulic load that is drained to every
                                                                                                                       stack shall conform to Table 2.4.10.6.-A.

                                                                                                                          2) Where the nominally horizontal offset in a stack is 1.5 m or more, the hydraulic
                                                                                                                       load that is served by it shall conform to Table 2.4.10.6.-B or Table 2.4.10.6.-C,
                                                                                                                       whichever is the less restrictive.

                                                                                                                                                            Table 2.4.10.6.-A
                                                                                                                                         Maximum Permitted Hydraulic Load Drained to a Stack
                                                                                                                                  Forming Part of Sentences 2.4.10.6.(1) and 2.5.7.3.(2), and Table 2.5.8.4.

                                                                                                       Nominal Pipe Size of Stack, NPS          Maximum Hydraulic Load, fixture units      Maximum Fixture Units Drained from any 1 Storey
                                                                                                                     1¼                                         2                                                 2
                                                                                                                     1½                                         8                                                 2
                                                                                                                      2                                        24                                                 6
                                                                                                                      3                                       102                                                18
                                                                                                                      4                                       540                                               100
                                                                                                                      5                                      1 400                                              250
                                                                                                                      6                                      2 900                                              500
                                                                                                                      8                                      7 600                                              830
                                                                                                                     10                                     15 000                                             2 700
                                                                                                                     12                                     26 000                                             4 680
                                                                                                                     15                                     50 000                                             9 000




                                                                                                    2-34 Division B                                                                             National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                                 2.4.10.9.

                                                                                                                                                                 Table 2.4.10.6.-B
                                                                                                                                             Maximum Permitted Hydraulic Load Drained to a Branch
                                                                                                                                          Forming Part of Sentences 2.4.10.6.(2), 2.4.10.7.(1) and 2.5.7.3.(2)

                                                                                                                         Nominal Pipe Size of Branch, NPS                                   Maximum Hydraulic Load, fixture units
                                                                                                                                        1¼                                                                  2
                                                                                                                                        1½                                                                  3
                                                                                                                                         2                                                                  6
                                                                                                                                         3                                                                 27
                                                                                                                                         4                                                                180




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                         5                                                                390
                                                                                                                                         6                                                                700
                                                                                                                                         8                                                               1 600
                                                                                                                                        10                                                               2 500
                                                                                                                                        12                                                               3 900


                                                                                                                                                            Table 2.4.10.6.-C
                                                                                                                              Maximum Permitted Hydraulic Load Drained to a Sanitary Building Drain or Sewer
                                                                                                                                        Forming Part of Sentence 2.4.10.6.(2) and Article 2.4.10.8.

                                                                                                       Nominal Pipe                                                 Maximum Hydraulic Load, fixture units
                                                                                                      Size of Drain or                                                             Slope
                                                                                                        Sewer, NPS               1 in 400            1 in 200           1 in 133            1 in 100             1 in 50            1 in 25
                                                                                                             3                     n/a                  n/a                n/a                 n/a                 27                 36
                                                                                                             4                     n/a                  n/a                n/a                180                 240                300
                                                                                                             5                     n/a                  n/a               380                 390                 480                670
                                                                                                             6                     n/a                  n/a               600                 700                 840               1 300
                                                                                                             8                     n/a                1 400              1 500               1 600               2 250              3 370
                                                                                                            10                     n/a                2 500              2 700               3 000               4 500              6 500
                                                                                                            12                    2 240               3 900              4 500                5 400               8 300             13 000
                                                                                                            15                    4 800               7 000              9 300               10 400              16 300             22 500


                                                                                                    2.4.10.7.              Hydraulic Loads on Branches

                                                                                                                              1) The hydraulic load that is drained to a branch shall conform to Table 2.4.10.6.-B.

                                                                                                    2.4.10.8.              Hydraulic Loads on Sanitary Building Drains or Sewers

                                                                                                                              1) The hydraulic load that is drained to a sanitary building drain or a sanitary
                                                                                                                           building sewer shall conform to Table 2.4.10.6.-C.

                                                                                                    2.4.10.9.              Hydraulic Loads on Storm or Combined Building Drains or Sewers

                                                                                                                              1) The hydraulic load that is drained to a storm building drain, a storm building sewer
                                                                                                                           or a combined building sewer shall conform to Table 2.4.10.9.




                                                                                                    National Plumbing Code of Canada 2020                                                                                       Division B 2-35
                                                                                                    2.4.10.10.                                                                                                                     Division B

                                                                                                                                                        Table 2.4.10.9.
                                                                                                           Maximum Permitted Hydraulic Load Drained to a Storm Building Drain or Sewer, or a Combined Building Sewer
                                                                                                                                    Forming Part of Sentence 2.4.9.5.(2) and Article 2.4.10.9.

                                                                                                       Nominal Pipe                                                         Maximum Hydraulic Load, L
                                                                                                      Size of Drain or                                                                Slope
                                                                                                        Sewer, NPS            1 in 400            1 in 200         1 in 133         1 in 100             1 in 68         1 in 50             1 in 25
                                                                                                             3                  n/a                 n/a              n/a               n/a                 n/a            2 770               3 910
                                                                                                             4                  n/a                 n/a              n/a              4 220               5 160           5 970               8 430
                                                                                                             5                  n/a                 n/a             6 760             7 650               9 350          10 800               15 300




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                             6                  n/a                 n/a            10 700            12 400              15 200          17 600               24 900
                                                                                                             8                  n/a               18 900           23 200            26 700              32 800          37 800               53 600
                                                                                                            10                  n/a               34 300           41 900            48 500              59 400          68 600               97 000
                                                                                                            12                37 400               55 900          68 300           78 700                96 500         112 000             158 000
                                                                                                            15                71 400              101 000          124 000          143 000              175 000         202 000             287 000


                                                                                                    2.4.10.10.           Hydraulic Loads to Roof Gutters

                                                                                                                           1) The hydraulic load that is drained to a roof gutter shall conform to Table 2.4.10.10.

                                                                                                                                                               Table 2.4.10.10.
                                                                                                                                           Maximum Permitted Hydraulic Load Drained to a Roof Gutter
                                                                                                                                                       Forming Part of Article 2.4.10.10.

                                                                                                                                                                                               Maximum Hydraulic Load, L
                                                                                                       Nominal Pipe Size of
                                                                                                                                         Area of Gutter, cm2                                               Slope
                                                                                                          Gutter, NPS
                                                                                                                                                                       1 in 200               1 in 100              1 in 50                 1 in 25
                                                                                                                 3                             22.8                      406                     559                  812                    1 140
                                                                                                                 4                             40.5                      838                    1 190                1 700                   2 410
                                                                                                                 5                             63.3                     1 470                   2 080                2 950                   4 170
                                                                                                                 6                             91.2                     2 260                   3 200                4 520                   6 530
                                                                                                                 7                             124.1                    3 250                   4 600                6 500                   9 190
                                                                                                                 8                             162.1                    4 700                   6 600                9 400                  13 200
                                                                                                                 10                            253.4                    8 480                  12 000               17 000                  23 600


                                                                                                    2.4.10.11.           Hydraulic Loads on Leaders

                                                                                                                           1) The hydraulic load that is drained to a leader shall conform to Table 2.4.10.11.

                                                                                                                                                                Table 2.4.10.11.
                                                                                                                                              Maximum Permitted Hydraulic Load Drained to a Leader
                                                                                                                                                        Forming Part of Article 2.4.10.11.

                                                                                                                                Circular Leader                                                           Non-Circular Leader
                                                                                                     Nominal Pipe Size of Leader, NPS         Maximum Hydraulic Load, L               Area of Leader, cm2              Maximum Hydraulic Load, L
                                                                                                                     2                                     1 700                              20.3                                  1 520
                                                                                                                   2½                                      3 070                              31.6                                  2 770
                                                                                                                     3                                     5 000                              45.6                                  4 500
                                                                                                                     4                                    10 800                              81.1                                 9 700
                                                                                                                     5                                    19 500                             126.6                                 17 600
                                                                                                                     6                                    31 800                             182.4                                 28 700
                                                                                                                     8                                    68 300                             324.3                                 61 500


                                                                                                    2-36 Division B                                                                                         National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                     2.5.1.1.

                                                                                                    2.4.10.12.        Hydraulic Loads from Fixtures with a Semi-continuous Flow
                                                                                                                         1) The hydraulic load from a fixture or equipment that produces a semi-continuous
                                                                                                                      flow shall conform to Table 2.4.10.12.

                                                                                                                                                        Table 2.4.10.12.
                                                                                                                           Maximum Permitted Hydraulic Load from Fixtures with a Semi-continuous Flow
                                                                                                                                             Forming Part of Sentence 2.4.10.12.(1)

                                                                                                          Nominal Pipe Size of Trap, NPS                    Flow, L/s                       Hydraulic Load, fixture units
                                                                                                                       1½                                 0.000 - 0.090                                  3




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                        2                                 0.091 - 0.190                                  6
                                                                                                                        3                                 0.191 - 0.850                                 27
                                                                                                                        4                                 0.851 - 5.700                                 180


                                                                                                    2.4.10.13.        Design of Storm Sewers
                                                                                                                         1) Except as provided in Sentences 2.4.10.4.(1) and (2), and Article 2.4.10.9., storm
                                                                                                                      sewers may be designed in accordance with good engineering practice.


                                                                                                    Section 2.5. Venting Systems
                                                                                                    2.5.1.            Vent Pipes for Traps
                                                                                                    2.5.1.1.          Venting for Traps
                                                                                                                         1) Except as provided in Sentences (3) and (4), traps shall be protected by a vent
                                                                                                                      pipe.
                                                                                                                        2) Drainage systems may require additional protection as provided in
                                                                                                                      Subsections 2.5.4. and 2.5.5. by the installation of
                                                                                                                         a) branch vents,
                                                                                                                         b) vent stacks,
                                                                                                                         c) stack vents,
                                                                                                                         d) vent headers,
                                                                                                                         e) fresh air inlets,
                                                                                                                         f) relief vents,
                                                                                                                         g) circuit vents,
                                                                                                                         h) yoke vents,
                                                                                                                          i) offset relief vents,
                                                                                                                          j) additional circuit vents,
                                                                                                                         k) wet vents,
                                                                                                                          l) individual vents,
                                                                                                                        m) dual vents, or
                                                                                                                         n) continuous vents.
                                                                                                                         3) A trap that serves a floor drain need not be protected where
                                                                                                                         a) the nominal pipe size of the trap is not less than NPS 3,
                                                                                                                         b) the length of the fixture drain is not less than 450 mm, and
                                                                                                                          c) the fall on the fixture drain does not exceed its nominal pipe size.
                                                                                                                      (See Note A-2.5.1.1.(3).)
                                                                                                                         4) A trap need not be protected by a vent pipe
                                                                                                                         a) where it serves
                                                                                                                                i) a subsoil drainage pipe, or
                                                                                                                               ii) a storm drainage system, or
                                                                                                                         b) where it forms part of an indirect drainage system (see also
                                                                                                                            Clause 2.4.2.3.(2)(b)).
                                                                                                                      (See Note A-2.5.1.1.(4).)


                                                                                                    National Plumbing Code of Canada 2020                                                                        Division B 2-37
                                                                                                    2.5.2.1.                                                                                            Division B

                                                                                                    2.5.2.            Wet Venting
                                                                                                    2.5.2.1.          Wet Venting
                                                                                                                      (See Note A-2.5.2.1.)
                                                                                                                         1)    A sanitary drainage pipe is permitted to serve as a wet vent, provided
                                                                                                                         a)    the hydraulic load is in accordance with Table 2.5.8.1.,
                                                                                                                         b)    the number of wet-vented water closets does not exceed 2,
                                                                                                                         c)    where 2 water closets are installed, they are connected at the same level by
                                                                                                                               means of a double sanitary T fitting if the vent pipe is vertical and by means
                                                                                                                               of a double Y fitting if the vent pipe is horizontal,
                                                                                                                         d)    the water closets are installed downstream of all other fixtures,




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                         e)    trap arms and fixture drains connected to the wet vent do not exceed NPS 2,
                                                                                                                               except for connections from emergency floor drains in accordance with
                                                                                                                               Sentence 2.5.1.1.(3),
                                                                                                                          f)   the total hydraulic load on the wet vent does not exceed the limits stated in
                                                                                                                               Table 2.5.8.1. when separately vented branches or fixture drains in the same
                                                                                                                               storey, having a total hydraulic load not greater than 2 fixture units, are
                                                                                                                               connected to the wet vent or a wet-vented water-closet trap arm,
                                                                                                                          g)   the hydraulic load of separately vented fixtures that drain into the wet vent
                                                                                                                               are not included when sizing the continuous vent that serves the wet vent,
                                                                                                                         h)    where a wet vent extends through more than one storey, the total discharge
                                                                                                                               from any one storey above the first storey does not exceed 4 fixture units,
                                                                                                                          i)   there is not more than one nominally horizontal offset in the wet vent, and
                                                                                                                                  i) the offset does not exceed 1.2 m for pipes of NPS 2 or less , or
                                                                                                                                 ii) the offset does not exceed 2.5 m for pipes larger than NPS 2,
                                                                                                                          j)   the nominal pipe size of the wet-vented portion is not reduced, except for
                                                                                                                               the portion that is upstream of emergency floor drains in accordance with
                                                                                                                               Sentence 2.5.1.1.(3), and
                                                                                                                          k)   the length of the wet vent is not limited.

                                                                                                    2.5.3.            Circuit Venting
                                                                                                    2.5.3.1.          Circuit Venting
                                                                                                                      (See Note A-2.5.3.1.)
                                                                                                                         1)    A section of horizontal branch is permitted to be circuit-vented, provided
                                                                                                                         a)    a circuit vent is connected to it,
                                                                                                                         b)    all fixtures served by the circuit vent are located in the same storey, and
                                                                                                                         c)    no stack is connected to it upstream of a circuit-vented fixture.
                                                                                                                         2) Fixtures with fixture outlet pipes less than NPS 2 shall be separately vented or
                                                                                                                      separately circuit-vented.
                                                                                                                         3) Except as provided in Sentences (4) and (5), a relief vent shall be connected to
                                                                                                                      the branch that forms part of a circuit-vented system, downstream of the connection of
                                                                                                                      the most downstream circuit-vented fixture.
                                                                                                                         4) A sanitary drainage pipe having a hydraulic load not greater than 6 fixture units is
                                                                                                                      permitted to act as a relief vent for a branch that is circuit-vented.
                                                                                                                          5) A symmetrically connected relief vent is permitted to serve as a combined relief
                                                                                                                      vent for a maximum of 2 branches that are circuit-vented, provided there are not more
                                                                                                                      than 8 circuit-vented fixtures connected between the combined relief vent and each
                                                                                                                      circuit vent.
                                                                                                                         6) Additional circuit vents shall be required
                                                                                                                         a) where each cumulative horizontal change in direction of a branch served by
                                                                                                                            a circuit vent exceeds 45° between vent pipe connections, or
                                                                                                                         b) where more than 8 circuit-vented fixtures are connected to a branch between
                                                                                                                            vent pipe connections.
                                                                                                                         7) A sanitary drainage pipe is permitted to serve as an additional circuit vent in
                                                                                                                      accordance with Sentence (6), provided the sanitary drainage pipe is sized as a wet vent
                                                                                                                      in conformance with Article 2.5.8.1. and is not less than NPS 2.


                                                                                                    2-38 Division B                                                                   National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                2.5.4.4.

                                                                                                                        8) Connections to circuit vents and additional circuit vents in accordance with
                                                                                                                     Sentence (6) shall conform to Sentence 2.5.4.5.(1).
                                                                                                                        9) A circuit-vented branch, including the fixture drain downstream of the circuit
                                                                                                                     vent connection, shall be sized in accordance with Article 2.4.10.7., except that it shall
                                                                                                                     be not less than
                                                                                                                        a) NPS 2, where traps less than NPS 2 are circuit-vented, or
                                                                                                                        b) NPS 3, where traps of NPS 2 or larger are circuit-vented.
                                                                                                                      10) Additional circuit vents shall be sized in accordance with Table 2.5.7.1. and
                                                                                                                     Sentence 2.5.7.3.(1).
                                                                                                                       11) The hydraulic load on a circuit vent shall include the hydraulic load from fixtures




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                     connected to the branch served by the circuit vent, but shall not include the hydraulic
                                                                                                                     load from fixtures permitted by Sentences (3), (4) and (5).

                                                                                                    2.5.4.           Vent Pipes for Stacks
                                                                                                    2.5.4.1.         Stack Vents
                                                                                                                        1) The upper end of every stack shall terminate in a stack vent.

                                                                                                    2.5.4.2.         Vent Stacks
                                                                                                                        1) Except as provided in Sentence (2), every stack that drains fixtures from more
                                                                                                                     than 4 storeys containing plumbing fixtures shall have a vent stack.
                                                                                                                        2) A stack that serves as a wet vent does not require a vent stack.
                                                                                                                        3) The vent stack required by Sentence (1) shall be connected to a vertical section of
                                                                                                                     the stack at or immediately below the lowest sanitary drainage pipe connected to the stack.
                                                                                                                        4) Fixtures are permitted to be connected to a vent stack, provided
                                                                                                                        a) the total hydraulic load of the connected fixtures does not exceed
                                                                                                                           8 fixture units,
                                                                                                                        b) at least one fixture is connected to a vertical portion of the vent stack and
                                                                                                                           upstream of any other fixtures,
                                                                                                                        c) no other fixture is connected downstream of a water closet,
                                                                                                                        d) all fixtures are located in the lowest storey served by the vent stack, and
                                                                                                                        e) the section of the vent pipe that acts as a wet vent conforms to the
                                                                                                                           requirements regarding wet vents.

                                                                                                    2.5.4.3.         Yoke Vents
                                                                                                                     (See Note A-2.5.4.3.)
                                                                                                                         1) Except as provided in Sentence (4), where a stack receives the discharge from
                                                                                                                     fixtures located on more than 11 storeys, a yoke vent shall be installed
                                                                                                                         a) for each section of 5 storeys or part thereof counted from the top down, and
                                                                                                                         b) at or immediately above each offset or double offset.
                                                                                                                        2) The yoke vent shall be connected to the stack by means of a drainage fitting at
                                                                                                                     or immediately below the lowest sanitary drainage pipe from the lowest storey of the
                                                                                                                     sections described in Sentence (1).
                                                                                                                        3) The yoke vent shall connect to the vent stack at least 1 m above the floor level of
                                                                                                                     the lowest storey in the section described in Sentence (1).
                                                                                                                        4) A yoke vent need not be installed provided the stack is interconnected with the
                                                                                                                     vent stack in each storey of the section in which fixtures are located by means of a vent pipe
                                                                                                                     equal in nominal pipe size to the branch or fixture drain or NPS 2, whichever is smaller.

                                                                                                    2.5.4.4.         Offset Relief Vents
                                                                                                                        1) A stack that has a nominally horizontal offset more than 1.5 m long and above
                                                                                                                     which the upper vertical portion of the stack passes through more than 2 storeys and
                                                                                                                     receives a hydraulic load of more than 100 fixture units shall be vented by an offset relief


                                                                                                    National Plumbing Code of Canada 2020                                                                    Division B 2-39
                                                                                                    2.5.4.5.                                                                                                          Division B

                                                                                                                      vent connected to the vertical section immediately above the offset and by another
                                                                                                                      offset relief vent
                                                                                                                          a) connected to the lower vertical section at or above the highest sanitary
                                                                                                                               drainage pipe connection, or
                                                                                                                          b) extended as a vertical continuation of the lower section.
                                                                                                                      (See Note A-2.5.4.4.(1).)

                                                                                                    2.5.4.5.          Fixtures Draining into Vent Pipes
                                                                                                                          1) The trap arm of a fixture that has a hydraulic load of not more than
                                                                                                                      1½ fixture units may be connected to the vertical section of a circuit vent, additional
                                                                                                                      circuit vent, offset relief vent or yoke vent, provided




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                          a) not more than 2 fixtures are connected to the vent pipe,
                                                                                                                          b) where 2 fixtures are connected to the vent pipe, the connection is made by
                                                                                                                               means of a double sanitary T fitting, and
                                                                                                                          c) the section of the vent pipe that acts as a wet vent is not less than NPS 2.
                                                                                                                      (See Note A-2.5.4.5.(1).)

                                                                                                    2.5.5.            Miscellaneous Vent Pipes
                                                                                                    2.5.5.1.          Venting of Sewage Sumps
                                                                                                                         1) Every sump that receives sewage shall be provided with a vent pipe that is
                                                                                                                      connected to the top of the sump. (See Article 2.5.7.7. for sizing of these vents.)

                                                                                                    2.5.5.2.          Venting of Oil Interceptors
                                                                                                                      (See Note A-2.5.5.2.) (See also Article 4.3.5.2. of Division B of the NFC.)
                                                                                                                         1)   Every oil interceptor shall be provided with 2 vent pipes that
                                                                                                                         a)   connect to the interceptor at opposite ends,
                                                                                                                         b)   extend independently to outside air, and
                                                                                                                         c)   terminate not less than 2 m above ground and at elevations differing by
                                                                                                                              at least 300 mm.
                                                                                                                         2) Adjacent compartments within an oil interceptor shall be connected to each
                                                                                                                      other by a vent opening.
                                                                                                                         3) Where a secondary receiver for oil is installed in conjunction with an oil
                                                                                                                      interceptor, it shall be vented in accordance with the manufacturer's recommendations,
                                                                                                                      and the vent pipe shall
                                                                                                                          a) in no case be less than NPS 1½,
                                                                                                                          b) extend independently to outside air, and
                                                                                                                          c) terminate not less than 2 m above ground.
                                                                                                                         4) The vent pipes referred to in Sentence (1) are permitted to be one NPS smaller
                                                                                                                      than the largest connected drainage pipe but not less than NPS 1¼, or can be sized in
                                                                                                                      accordance with the manufacturer's recommendations.
                                                                                                                         5) A vent pipe that serves an oil interceptor and is located outside a building shall be
                                                                                                                      not less than NPS 3 in areas where it may be subject to frost closure.

                                                                                                    2.5.5.3.          Venting of Drain Piping and Tanks for Corrosive Waste
                                                                                                                         1) Venting systems for drain piping, neutralizing tanks, or dilution tanks
                                                                                                                      conveying corrosive waste shall extend independently and terminate outdoors. (See
                                                                                                                      Article 2.5.7.7. for sizing of these vents.)

                                                                                                    2.5.5.4.          Fresh Air Inlets
                                                                                                                         1) Where a building trap is installed, a fresh air inlet not less than NPS 4 shall be
                                                                                                                      connected upstream and within 1.2 m of the building trap and downstream of any
                                                                                                                      other connection. (See Note A-2.4.5.4.(1).)


                                                                                                    2-40 Division B                                                                                 National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                    2.5.6.3.

                                                                                                    2.5.5.5.           Provision for Future Installations
                                                                                                                          1) Where provision is made for a fixture to be installed in the future, the drainage
                                                                                                                       system and venting system shall be sized accordingly and provision shall be made for
                                                                                                                       the necessary future connections.
                                                                                                                          2) Except as required in Sentence 2.5.7.7.(2), where a plumbing system is installed
                                                                                                                       in a building, every storey in which plumbing is or may be installed, including the
                                                                                                                       basement of a single-family dwelling, shall have extended into it or passing through it
                                                                                                                       a vent pipe that is at least NPS 1½ for the provision of future connections.

                                                                                                    2.5.6.             Arrangement of Vent Pipes




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    2.5.6.1.           Drainage of Vent Pipes
                                                                                                                             1) Vent pipes shall be installed without depressions in which moisture can collect.

                                                                                                    2.5.6.2.           Vent Pipe Connections
                                                                                                                          1) Vent pipes shall be installed in a nominally vertical position where it is practical
                                                                                                                       to do so.
                                                                                                                          2) Except for wet vents, where a vent pipe is connected to a nominally horizontal
                                                                                                                       sanitary drainage pipe, the connection shall be above the horizontal centre line of the
                                                                                                                       sanitary drainage pipe. (See Note A-2.5.6.2.(2).)
                                                                                                                          3) Unused vent pipes installed for future connections shall be permanently capped
                                                                                                                       with an end cleanout or an adapter and plug.

                                                                                                    2.5.6.3.           Location of Vent Pipes
                                                                                                                          1) Except as provided in Sentences (2) and (3), vent pipes that protect a fixture trap
                                                                                                                       shall be located so that
                                                                                                                          a) the developed length of the trap arm is not less than twice the NPS of the
                                                                                                                               fixture drain,
                                                                                                                          b) the total fall of the trap arm is not greater than its inside diameter, and
                                                                                                                           c) the trap arm does not have a cumulative change in direction of more than
                                                                                                                               135°.
                                                                                                                       (See Note A-2.5.6.3.(1).)
                                                                                                                          2) The trap arm of water closets, of S-trap standards or of any other fixture that also
                                                                                                                       discharges vertically and depends on siphonic action for its proper functioning shall
                                                                                                                       not have a cumulative change in direction of more than 225°. (See Note A-2.5.6.3.(2).)
                                                                                                                          3) A vent pipe that protects a water closet or any other fixture that also depends on
                                                                                                                       siphonic action for its proper functioning shall be located so that the distance between
                                                                                                                       the connections of the fixture drain to the fixture and the vent pipe does not exceed
                                                                                                                           a) 1 m in the vertical plane, and
                                                                                                                           b) 3 m in the horizontal plane.
                                                                                                                       (See Note A-2.5.6.3.(3).)
                                                                                                                             4) The maximum length of every trap arm shall conform to Table 2.5.6.3.

                                                                                                                                                            Table 2.5.6.3.
                                                                                                                                                         Length of Trap Arm
                                                                                                                                                  Forming Part of Sentence 2.5.6.3.(4)

                                                                                                        Nominal Pipe Size of Trap Served, NPS        Maximum Length of Trap Arm, m                Minimum Slope
                                                                                                                         1¼                                       1.5                                 1/50
                                                                                                                         1½                                       1.8                                 1/50
                                                                                                                         2                                        2.4                                 1/50
                                                                                                                         3                                        3.6                                 1/50
                                                                                                                         4                                        9.8                                 1/100


                                                                                                    National Plumbing Code of Canada 2020                                                                     Division B 2-41
                                                                                                    2.5.6.4.                                                                                                Division B

                                                                                                    2.5.6.4.          Connection of Vents above Fixtures Served

                                                                                                                         1) Except for a wet vent, every vent pipe shall extend above the flood level rim of
                                                                                                                      every fixture that it serves before being connected to another vent pipe.

                                                                                                                         2) No vent pipe shall be connected in such a manner that a blockage in a sanitary
                                                                                                                      drainage pipe would cause waste to drain through the vent pipe to the drainage system.

                                                                                                    2.5.6.5.          Terminals

                                                                                                                         1) Except as provided in Sentence (3), the upper end of every vent pipe that is not
                                                                                                                      terminated in outside air shall be connected to a venting system that terminates through




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                      a roof to outside air.

                                                                                                                         2) The upper end of every vent pipe that is terminated in outside air, other than a
                                                                                                                      vent pipe that serves an oil interceptor or a fresh air inlet, shall be extended above the roof.

                                                                                                                         3) A vent pipe is permitted to be erected outside a building, provided that
                                                                                                                         a) no single change in direction of the vent pipe exceeds 45°,
                                                                                                                         b) all parts of the vent pipe are nominally vertical,
                                                                                                                         c) in areas where the vent pipe may be subject to frost closure, it is increased to
                                                                                                                            not less than NPS 3 before penetrating a wall or roof, and
                                                                                                                         d) where the building is 4 storeys or less in height, the vent pipe terminates above
                                                                                                                            the roof of the building.

                                                                                                                         4) Except for a fresh air inlet, where a vent pipe is terminated in outside air, the
                                                                                                                      terminal shall be located
                                                                                                                         a) not less than 1 m above and not less than 3.5 m in any other direction from
                                                                                                                             every air inlet, openable window or door,
                                                                                                                         b) not less than 2 m above and not less than 3.5 m in any other direction from
                                                                                                                             a roof that supports an occupancy,
                                                                                                                          c) not less than 2 m above ground, and
                                                                                                                         d) not less than 1.8 m from every property line.
                                                                                                                      (See Note A-2.5.6.5.(4).)

                                                                                                                         5) Where a vent pipe passes through a roof, it shall
                                                                                                                         a) be terminated high enough to prevent the entry of roof drainage but not less
                                                                                                                            than 150 mm above the roof or above the surface of storm water, which could
                                                                                                                            pond on the roof (see Note A-2.5.6.5.(4)), and
                                                                                                                         b) be provided with flashing to prevent the entry of water between the vent
                                                                                                                            pipe and the roof (see Article 2.2.10.14.).

                                                                                                                         6) Where a vent pipe passes through a roof and may be subject to frost closure, it
                                                                                                                      shall be protected from frost closure by
                                                                                                                         a) increasing its diameter at least one NPS, but not less than NPS 3,
                                                                                                                              immediately before it penetrates the roof,
                                                                                                                         b) insulating the pipe, or
                                                                                                                          c) protecting it in some other manner.
                                                                                                                      (See Article 2.3.4.7.)

                                                                                                    2.5.7.            Minimum Size of Vent Pipes

                                                                                                    2.5.7.1.          General

                                                                                                                         1) The nominal pipe size of every vent pipe shall conform to Table 2.5.7.1.




                                                                                                    2-42 Division B                                                                      National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                     2.5.7.7.

                                                                                                                                                           Table 2.5.7.1.
                                                                                                                                 Minimum Permitted Size of Vent Pipe Based on Size of Trap Served
                                                                                                                                        Forming Part of Sentences 2.5.7.1.(1) and 2.5.8.2.(1)

                                                                                                                 Nominal Pipe Size of Trap Served, NPS                     Minimum Nominal Pipe Size of Vent Pipe, NPS
                                                                                                                                  1¼                                                          1¼
                                                                                                                                  1½                                                          1¼
                                                                                                                                   2                                                          1½
                                                                                                                                   3                                                          1½
                                                                                                                                   4                                                          1½




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                   5                                                           2
                                                                                                                                   6                                                           2


                                                                                                    2.5.7.2.         Size Restriction

                                                                                                                        1) The nominal pipe size of a branch vent, stack vent, vent stack or vent header shall be
                                                                                                                     not less than the nominal pipe size of the vent pipe to which it is connected.

                                                                                                                        2) Sanitary building drains shall be provided with at least one vent that is not less
                                                                                                                     than NPS 3.

                                                                                                    2.5.7.3.         Additional Circuit Vents and Relief Vents

                                                                                                                         1) Except as provided in Article 2.5.7.1. and Sentence 2.5.3.1.(7), the minimum
                                                                                                                     nominal pipe size of an additional circuit vent or relief vent installed in conjunction with a
                                                                                                                     circuit vent is permitted to be one NPS smaller than the required nominal pipe size of the
                                                                                                                     circuit vent, but need not be larger than NPS 2.

                                                                                                                         2) The nominal pipe size of the sanitary drainage pipe acting as a relief
                                                                                                                     vent in accordance with Sentence 2.5.3.1.(4) shall be in conformance with
                                                                                                                     Table 2.4.10.6.-A, 2.4.10.6.-B or 2.5.8.1., and Article 2.5.7.1., whichever nominal pipe size
                                                                                                                     is the largest considering the hydraulic load drained into the sanitary drainage pipe.

                                                                                                    2.5.7.4.         Offset Relief Vents

                                                                                                                         1) Except as provided in Article 2.5.7.1., the minimum nominal pipe size of an offset
                                                                                                                     relief vent is permitted to be one NPS smaller than the NPS of the stack vent.

                                                                                                    2.5.7.5.         Yoke Vents

                                                                                                                        1) Yoke vents required by Sentence 2.5.4.3.(1) are permitted to be one NPS smaller
                                                                                                                     than the NPS of the smallest pipe to which they are connected.

                                                                                                    2.5.7.6.         Vent Pipes for Manholes

                                                                                                                        1) The minimum nominal pipe size of a vent pipe that serves a manhole within a
                                                                                                                     building shall be NPS 2.

                                                                                                    2.5.7.7.         Vents for Sewage Sumps, Neutralizing and Dilution Tanks, and
                                                                                                                     Macerating Toilet Systems

                                                                                                                        1) Except as provided in Sentences (2) and (3), the minimum nominal pipe size of
                                                                                                                     the vent pipe for a sewage sump or neutralizing or dilution tank shall be one NPS smaller
                                                                                                                     than the NPS of the largest branch or fixture drain draining to the sump.

                                                                                                                        2) The nominal pipe size of every vent pipe for a sewage sump or neutralizing or
                                                                                                                     dilution tank shall be not less than NPS 2, but need not be greater than NPS 4.

                                                                                                                        3) The nominal pipe size of a vent pipe for a macerating toilet system with a sump
                                                                                                                     shall be not less than NPS 1½.


                                                                                                    National Plumbing Code of Canada 2020                                                                        Division B 2-43
                                                                                                    2.5.8.1.                                                                                                              Division B

                                                                                                    2.5.8.             Sizing of Vent Pipes
                                                                                                                       (See Note A-2.5.8. for an explanation on the sizing of vent pipes.)

                                                                                                    2.5.8.1.           Hydraulic Loads Draining to Wet Vents

                                                                                                                             1) The hydraulic load that drains to a wet vent shall conform to Table 2.5.8.1.

                                                                                                                          2) When determining the nominal pipe size of a wet vent, the hydraulic load from
                                                                                                                       the most downstream fixture or symmetrically connected fixtures shall not be included.
                                                                                                                       (See Note A-2.5.8.1.(2).)




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                              Table 2.5.8.1.
                                                                                                                                       Maximum Permitted Hydraulic Loads Drained to a Wet Vent
                                                                                                                                           Forming Part of Sentences 2.5.7.3.(2) and 2.5.8.1.(1)

                                                                                                                                                                            Maximum Hydraulic Load, fixture units
                                                                                                         Nominal Pipe Size of Wet Vent, NPS                                                    Fixtures, Other Than Water Closets, That Serve
                                                                                                                                                           Not Serving Water Closets
                                                                                                                                                                                                       Not More Than 2 Water Closets
                                                                                                                        1½                                             2                                            n/a
                                                                                                                         2                                             4                                             3
                                                                                                                         3                                            12                                             8
                                                                                                                         4                                            36                                            14
                                                                                                                         5                                            n/a                                           18
                                                                                                                         6                                            n/a                                           23


                                                                                                    2.5.8.2.           Individual Vents and Dual Vents

                                                                                                                          1) The nominal pipe size of individual vents and dual vents shall be determined using
                                                                                                                       Table 2.5.7.1. based on the largest trap served.

                                                                                                                          2) When sizing an individual vent or a dual vent, the length is not taken into
                                                                                                                       consideration.

                                                                                                    2.5.8.3.           Branch Vents, Vent Headers, Continuous Vents and Circuit Vents
                                                                                                                       (See Note A-2.5.8.3. and 2.5.8.4.)

                                                                                                                          1) Branch vents, vent headers, circuit vents and continuous vents shall be sized in
                                                                                                                       accordance with Table 2.5.8.3., unless they are individual vents or dual vents.

                                                                                                                          2) For the purposes of Table 2.5.8.3., the length of a branch vent shall be its developed
                                                                                                                       length from the most distant sanitary drainage pipe connection to a vent stack, stack vent,
                                                                                                                       vent header or outside air.

                                                                                                                          3) For the purposes of Table 2.5.8.3., the length of a vent header shall be its developed
                                                                                                                       length from the most distant sanitary drainage pipe connection to outside air.

                                                                                                                          4) For the purposes of Table 2.5.8.3., the length of a circuit vent shall be its developed
                                                                                                                       length from the horizontal sanitary drainage pipe connection to a vent stack, stack vent,
                                                                                                                       vent header or outside air.

                                                                                                                          5) For the purposes of Table 2.5.8.3., the length of a continuous vent shall be its
                                                                                                                       developed length from the vertical sanitary drainage pipe connection to a vent stack, stack
                                                                                                                       vent, vent header or outside air.




                                                                                                    2-44 Division B                                                                               National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                           2.5.8.4.

                                                                                                                                                                  Table 2.5.8.3.
                                                                                                                                   Sizing of Branch Vents, Vent Headers, Circuit Vents and Continuous Vents (1)
                                                                                                                                                          Forming Part of Article 2.5.8.3.

                                                                                                          Total Hydraulic Load                                        Nominal Pipe Size of Vent Pipe, NPS
                                                                                                          Served by Vent Pipe,          1¼           1½          2              3            4              5     6            8
                                                                                                               fixture units
                                                                                                                                                                       Maximum Length of Vent Pipe, m
                                                                                                                   2                     9           NL          NL            NL            NL             NL    NL           NL
                                                                                                                   8                     9           30          61            NL            NL             NL    NL           NL
                                                                                                                  20                    7.5          15          46            NL            NL             NL    NL           NL




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                  24                    4.5          9           30            NL            NL             NL    NL           NL
                                                                                                                  42                    NP           9           30            NL            NL             NL    NL           NL
                                                                                                                  60                    NP           4.5         15            120           NL             NL    NL           NL
                                                                                                                  100                   NP           NP          11            79           305             NL    NL           NL
                                                                                                                  200                   NP           NP          9             76           275             NL    NL           NL
                                                                                                                  500                   NP           NP          6             55           215             NL    NL           NL
                                                                                                                 1 100                  NP           NP         NP             15            61             215   NL           NL
                                                                                                                 1 900                  NP           NP         NP              6            21             61    215          NL
                                                                                                                 2 200                  NP           NP         NP             NP            9              27    105         335
                                                                                                                 3 600                  NP           NP         NP             NP           7.5             18    76          245
                                                                                                                 5 600                  NP           NP         NP             NP           NP              7.5   18           76

                                                                                                    Notes to Table 2.5.8.3.:
                                                                                                    (1)   NP = not permitted and NL = not limited.


                                                                                                    2.5.8.4.               Vent Stacks or Stack Vents
                                                                                                                           (See Note A-2.5.8.3. and 2.5.8.4.)

                                                                                                                                 1) A vent stack or stack vent shall be sized in accordance with Table 2.5.8.4. based on
                                                                                                                                 a) the length of the vent stack or stack vent, and
                                                                                                                                 b) the total hydraulic load that is drained to the lowest section of a stack served
                                                                                                                                    by the vent pipe, plus any additional vent loads connected to the vent stack
                                                                                                                                    or stack vent.

                                                                                                                              2) For the purposes of Table 2.5.8.4., the length of a stack vent or vent stack shall
                                                                                                                           be its developed length from its lower end to outside air.

                                                                                                                              3) The minimum nominal pipe size of a vent stack or stack vent shall be one-half
                                                                                                                           the NPS of the stack at its base.

                                                                                                                              4) A stack vent serving a wet vent stack that is over 4 storeys high shall extend
                                                                                                                           the full size of the wet vent to outside air.




                                                                                                    National Plumbing Code of Canada 2020                                                                               Division B 2-45
                                                                                                    2.5.8.4.                                                                                                                     Division B

                                                                                                                                                                      Table 2.5.8.4.
                                                                                                                                              Size and Developed Length of Stack Vents and Vent Stacks (1)
                                                                                                                                                      Forming Part of Sentences 2.5.8.4.(1) and (2)

                                                                                                                           Total                                     Nominal Pipe Size of Stack Vent or Vent Stack, NPS
                                                                                                     Nominal Pipe        Hydraulic                                                                5
                                                                                                                                        1¼          1½         2            3          4                     6             8      10      12
                                                                                                     Size of Stack,    Load Being
                                                                                                        NPS (2)           Vented,
                                                                                                                                                                      Maximum Length of Stack Vent or Vent Stack, m
                                                                                                                       fixture units
                                                                                                            1¼              2            9          NL        NL            NL         NL         NL         NL           NL      NL      NL
                                                                                                            1½              8            15          46       NL            NL         NL         NL         NL           NL      NL      NL




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                            12           9           23       61            NL         NL         NL         NL           NL      NL      NL
                                                                                                             2
                                                                                                                            24           8           15       46            NL         NL         NL         NL           NL      NL      NL
                                                                                                                            10          NP           13       46           317         NL         NL         NL           NL      NL      NL
                                                                                                                            21          NP           10       33.5         247         NL         NL         NL           NL      NL      NL
                                                                                                             3
                                                                                                                            53          NP           8        28.5         207         NL         NL         NL           NL      NL      NL
                                                                                                                           102          NP          7.5       26           189         NL         NL         NL           NL      NL      NL
                                                                                                                            43          NP          NP        10.5          76        299         NL         NL           NL      NL      NL
                                                                                                                           140          NP          NP         8            61        229         NL         NL           NL      NL      NL
                                                                                                             4
                                                                                                                           320          NP          NP         7            52        195         NL         NL           NL      NL      NL
                                                                                                                           540          NP          NP        6.5           46        177         NL         NL           NL      NL      NL
                                                                                                                           190          NP          NP        NP            25        97.5       302         NL           NL      NL      NL
                                                                                                                           490          NP          NP        NP            19         76        232         NL           NL      NL      NL
                                                                                                             5
                                                                                                                           940          NP          NP        NP            16         64        204         NL           NL      NL      NL
                                                                                                                          1 400         NP          NP        NP            15         58        180         NL           NL      NL      NL
                                                                                                                           500          NP          NP        NP            10        39.5       122        305           NL      NL      NL
                                                                                                                          1 100         NP          NP        NP            8         30.5       94.5       238           NL      NL      NL
                                                                                                             6
                                                                                                                          2 000         NP          NP        NP            6.5       25.5        79        201           NL      NL      NL
                                                                                                                          2 900         NP          NP        NP            6         23.5        73        183           NL      NL      NL
                                                                                                                          1 800         NP          NP        NP            NP         9.5        29         73           287     NL      NL
                                                                                                                          3 400         NP          NP        NP            NP         7          22         58       219.5       NL      NL
                                                                                                             8
                                                                                                                          5 600         NP          NP        NP            NP         6          19         49           186     NL      NL
                                                                                                                          7 600         NP          NP        NP            NP         5.5        17         43       170.5       NL      NL
                                                                                                                          4 000         NP          NP        NP            NP         NP         9.5        24           94.5   292.5    NL
                                                                                                                          7 200         NP          NP        NP            NP         NP         7          18           73     225.5    NL
                                                                                                            10
                                                                                                                         11 000         NP          NP        NP            NP         NP         6         15.5          61      192     NL
                                                                                                                         15 000         NP          NP        NP            NP         NP         5.5        14           55      174     NL
                                                                                                                          7 300         NP          NP        NP            NP         NP         NP         9.5          36.5    116    287
                                                                                                                         13 000         NP          NP        NP            NP         NP         NP         7            28.5    91     219.5
                                                                                                            12
                                                                                                                         20 000         NP          NP        NP            NP         NP         NP         6            24      76     186
                                                                                                                         26 000         NP          NP        NP            NP         NP         NP         5.5          22      70     152
                                                                                                                         15 000         NP          NP        NP            NP         NP         NP         NP           12      39.5   94.5
                                                                                                                         25 000         NP          NP        NP            NP         NP         NP         NP           9.5     29      73
                                                                                                            15
                                                                                                                         38 000         NP          NP        NP            NP         NP         NP         NP            8      24.5    61
                                                                                                                         50 000         NP          NP        NP            NP         NP         NP         NP            7      22.5    55

                                                                                                    Notes to Table 2.5.8.4.:
                                                                                                    (1)   NP = not permitted and NL = not limited.
                                                                                                    (2)   Stacks shall be sized using Table 2.4.10.6.-A.



                                                                                                    2-46 Division B                                                                                       National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                   2.6.1.2.

                                                                                                    2.5.8.5.         Lengths of Other Vent Pipes
                                                                                                                         1) When sizing an additional circuit vent, offset relief vent, relief vent, yoke vent, and
                                                                                                                     the vent pipe for an interceptor, dilution tank, sewage tank, sump, or manhole, length
                                                                                                                     is not taken into consideration.

                                                                                                    2.5.9.           Air Admittance Valves
                                                                                                                     (See Note A-2.2.10.16.(1).)

                                                                                                    2.5.9.1.         Air Admittance Valve as a Vent Terminal
                                                                                                                        1) Individual vents and dual vents are permitted to terminate with a connection




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                     to an air admittance valve as provided in Articles 2.5.9.2. and 2.5.9.3. (See also
                                                                                                                     Sentence 2.2.10.16.(1).)

                                                                                                    2.5.9.2.         Air Admittance Valves
                                                                                                                        1) Air admittance valves shall only be used to vent
                                                                                                                        a) fixtures located in island counters,
                                                                                                                        b) fixtures that may be affected by frost closure of the vent due to local climatic
                                                                                                                           conditions,
                                                                                                                        c) fixtures in one- and two-family dwellings undergoing renovation, or
                                                                                                                        d) installations where connection to a vent may not be practical.
                                                                                                                        2)   Air admittance valves shall be located
                                                                                                                        a)   not less than 100 mm above the fixture drain being vented,
                                                                                                                        b)   within the maximum developed length permitted for the vent, and
                                                                                                                        c)   not less than 150 mm above insulation materials.

                                                                                                    2.5.9.3.         Installation Conditions
                                                                                                                        1) Air admittance valves shall not be installed in supply or return air plenums, or in
                                                                                                                     locations where they may be exposed to freezing temperatures.
                                                                                                                        2) Air admittance valves shall be installed in accordance with the manufacturer's
                                                                                                                     installation instructions.
                                                                                                                        3) Air admittance valves shall be rated for the nominal pipe size of vent pipe to which
                                                                                                                     they are connected.
                                                                                                                        4) Installed air admittance valves shall be
                                                                                                                        a) accessible, and
                                                                                                                        b) located in a space that allows air to enter the valve.
                                                                                                                        5) Drainage systems shall have at least one vent that terminates to the outdoors in
                                                                                                                     conformance with Sentence 2.5.6.5.(1).


                                                                                                    Section 2.6. Potable Water Systems
                                                                                                    2.6.1.           Arrangement of Piping
                                                                                                    2.6.1.1.         Design
                                                                                                                       1) Fixtures supplied with separate hot and cold water controls shall have the hot
                                                                                                                     water control on the left and the cold on the right.
                                                                                                                        2) In a hot water distribution system of a developed length of more than 30 m or
                                                                                                                     supplying more than 4 storeys, the water temperature shall be maintained by
                                                                                                                        a) recirculation, or
                                                                                                                        b) a self-regulating heat tracing system.

                                                                                                    2.6.1.2.         Drainage
                                                                                                                        1) A water distribution system shall be installed so that the system can be drained or
                                                                                                                     blown out with air.


                                                                                                    National Plumbing Code of Canada 2020                                                                      Division B 2-47
                                                                                                    2.6.1.3.                                                                                                               Division B

                                                                                                    2.6.1.3.             Shut-off Valves
                                                                                                                            1) Water service pipes shall be provided with an accessible shut-off valve located as
                                                                                                                         close as possible to where the water service pipe enters the building.
                                                                                                                            2) Pipes that convey water from a gravity water tank or from a private water supply
                                                                                                                         system shall be fitted with a shut-off valve at the source of supply.
                                                                                                                            3) Except for risers that serve only one dwelling unit, risers shall be provided with a
                                                                                                                         shut-off valve located at the source of supply.
                                                                                                                              4) Water closets shall be provided with a shut-off valve on their water supply pipe.
                                                                                                                             5) In buildings of residential occupancy that contain more than one dwelling unit, a




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                         shut-off valve shall be installed where the water supply enters each dwelling unit, so
                                                                                                                         that, when the water supply to one suite is shut off, the water supply to the remainder
                                                                                                                         of the building is not interrupted. (See Note A-2.6.1.3.(5).)
                                                                                                                            6) In buildings of other than residential occupancy, shut-off valves shall be provided
                                                                                                                         on the water supply to
                                                                                                                            a) every fixture, or
                                                                                                                            b) any group of fixtures in the same room, except as provided in Sentence (4).
                                                                                                                            7) Pipes that supply water to a hot water tank shall be provided with a shut-off
                                                                                                                         valve located close to the tank.

                                                                                                    2.6.1.4.             Protection for Exterior Water Supply
                                                                                                                            1) Pipes that pass through an exterior wall to supply water to the exterior of the
                                                                                                                         building shall be provided with
                                                                                                                             a) a frost-proof hydrant, or
                                                                                                                             b) a stop-and-waste cock located inside the building and close to the wall.

                                                                                                    2.6.1.5.             Check Valves
                                                                                                                            1) A check valve shall be installed at the building end of a water service pipe where
                                                                                                                         the pipe is made of plastic that is suitable for cold water use only.

                                                                                                    2.6.1.6.             Flushing Devices
                                                                                                                            1) Flushing devices that serve water closets or urinals shall have sufficient capacity
                                                                                                                         and be adjusted to deliver at each operation a volume of water that will thoroughly
                                                                                                                         flush the fixture or fixtures they serve.
                                                                                                                           2) Where a manually operated flushing device is installed, it shall serve only
                                                                                                                         one fixture.
                                                                                                                            3) Except as provided in Sentence (4), water closets and urinals shall have an
                                                                                                                         integral means of limiting the maximum amount of water used in each flush cycle to
                                                                                                                         that specified in Table 2.6.1.6.

                                                                                                                                                                      Table 2.6.1.6.
                                                                                                                                                               Water Usage per Flush Cycle
                                                                                                                                                            Forming Part of Sentence 2.6.1.6.(3)

                                                                                                                                     Fixtures                                             Maximum Water Usage per Flush Cycle, Lpf
                                                                                                    Water closets – residential
                                                                                                        single-flush                                                                                        4.8
                                                                                                        dual-flush: 6.0/4.1 Lpf                                                                             4.8
                                                                                                    Water closets – industrial, commercial, institutional                                                   6.0
                                                                                                    Urinals                                                                                                 1.9


                                                                                                                            4) In residential retrofits, a maximum water usage of 6.0 Lpf shall be permitted for
                                                                                                                         single-flush water closets where it can be demonstrated that a maximum water usage of
                                                                                                                         4.8 Lpf would be impracticable given the existing building or municipal infrastructure.


                                                                                                    2-48 Division B                                                                                   National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                2.6.1.8.

                                                                                                                        5) Except where installed in buildings not intended to be occupied year-round,
                                                                                                                     flush-tank-type urinals shall be equipped with a device capable of preventing flush
                                                                                                                     cycles when they are not in use. (See Note A-2.6.1.6.(5).)

                                                                                                    2.6.1.7.         Relief Valves
                                                                                                                        1) In addition to the requirements in Sentence (2), the hot water tank of a
                                                                                                                     storage-type service water heater shall be equipped with a pressure-relief valve
                                                                                                                         a) designed to open when the water pressure in the tank reaches the rated
                                                                                                                             working pressure of the tank, and
                                                                                                                         b) so located that the pressure in the tank shall not exceed the pressure at the
                                                                                                                             relief valve by more than 35 kPa under any condition of flow within the




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                             distribution system.
                                                                                                                        2) The hot water tank of a storage-type service water heater shall be equipped with a
                                                                                                                     temperature-relief valve with a temperature-sensing element
                                                                                                                        a) located within the top 150 mm of the tank, and
                                                                                                                        b) designed to open and discharge sufficient water from the tank to keep
                                                                                                                           the temperature of the water in the tank from exceeding 99°C under all
                                                                                                                           operating conditions.
                                                                                                                        3) A pressure-relief valve and temperature-relief valve may be combined where
                                                                                                                     Sentences (1) and (2) are complied with.
                                                                                                                        4) Indirect service water heaters shall be equipped with
                                                                                                                        a) a pressure-relief valve, and
                                                                                                                        b) a temperature-relief valve on every storage tank that forms part of the
                                                                                                                           system.
                                                                                                                        5) Pipes that convey water from a temperature-relief, pressure-relief or combined
                                                                                                                     temperature- and pressure-relief valve shall
                                                                                                                        a) be of a nominal pipe size at least equal to the NPS of the outlet of the valve,
                                                                                                                        b) be rigid, slope downward from the valve, and terminate with an indirect
                                                                                                                            connection above a floor drain, sump, or other safe location, with an air break
                                                                                                                            of not more than 300 mm,
                                                                                                                         c) have no thread at their outlet, and
                                                                                                                        d) be capable of operating at a temperature of not less than 99°C.
                                                                                                                     (See Note A-2.6.1.7.(5).)
                                                                                                                        6) The temperature-relief valve required in Clause (4)(b) shall
                                                                                                                        a) have a temperature-sensing element located within the top 150 mm of the
                                                                                                                           tank, and
                                                                                                                        b) be designed to open and discharge sufficient water to keep the temperature
                                                                                                                           of the water in the tank from exceeding 99°C under all operating conditions.
                                                                                                                        7) No shut-off valve shall be installed on the pipe between any tank and the relief
                                                                                                                     valves or on the discharge lines from such relief valves.
                                                                                                                        8) A vacuum-relief valve shall be installed when any tank may be subject to
                                                                                                                     back-siphonage.
                                                                                                                         9) Storage-type service water heaters that are located in a ceiling or roof space, or over
                                                                                                                     a floor of wood construction, shall be installed within a corrosion-resistant watertight
                                                                                                                     drain pan, as described in Sentence (10).
                                                                                                                       10) The drain pan referred to in Sentence (9) shall
                                                                                                                        a) be not less than 50 mm larger than the tank and have side walls not less
                                                                                                                           than 25 mm high,
                                                                                                                        b) be drained by a pipe two NPS larger than the relief valve discharge pipe, and
                                                                                                                        c) have a drain that is located directly under the relief valve discharge pipe
                                                                                                                           and that discharges directly to a floor drain or other acceptable location.

                                                                                                    2.6.1.8.         Solar Domestic Hot Water Systems
                                                                                                                       1) Systems for solar heating of potable water shall be installed in conformance with
                                                                                                                     CAN/CSA-F383, “Installation of packaged solar domestic hot water systems.”


                                                                                                    National Plumbing Code of Canada 2020                                                                    Division B 2-49
                                                                                                    2.6.1.9.                                                                                             Division B

                                                                                                    2.6.1.9.          Water Hammer
                                                                                                                         1) Provision shall be made to protect the water distribution system from the adverse
                                                                                                                      effects of water hammer. (See Note A-2.6.1.9.(1).)

                                                                                                    2.6.1.10.         Mobile Home Water Service
                                                                                                                         1)   A water service pipe intended to serve a mobile home shall
                                                                                                                         a)   be not less than NPS ¾,
                                                                                                                         b)   terminate above ground, and
                                                                                                                         c)   be provided with
                                                                                                                                  i) a tamperproof terminal connection that is capable of being
                                                                                                                                     repeatedly connected, disconnected and sealed,




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                 ii) a protective concrete pad,
                                                                                                                                iii) a means to protect it from frost heave, and
                                                                                                                                iv) a curb stop and a means of draining that part of the pipe
                                                                                                                                     located above the frost line when not in use.

                                                                                                    2.6.1.11.         Thermal Expansion
                                                                                                                         1) Where thermal expansion can occur, protection shall be provided for
                                                                                                                          a) check valves required by Article 2.6.1.5.,
                                                                                                                         b) backflow preventers required by Sentence 2.6.2.1.(3), and
                                                                                                                          c) pressure-reducing valves required by Article 2.6.3.3.
                                                                                                                      (See Note A-2.6.1.11.(1).)

                                                                                                    2.6.1.12.         Service Water Heaters
                                                                                                                         1) Thermostat controls for electric storage-type service water heaters shall be set at a
                                                                                                                      temperature of 60°C. (See Note A-2.6.1.12.(1).)

                                                                                                    2.6.2.            Protection from Contamination
                                                                                                    2.6.2.1.          Connection of Systems
                                                                                                                         1) Except as provided in Sentence (2), connections to potable water systems shall
                                                                                                                      be designed and installed so that non-potable water or substances that may render the
                                                                                                                      water non-potable cannot enter the system.
                                                                                                                         2) A water treatment device or apparatus shall not be installed unless it can be
                                                                                                                      demonstrated that the device or apparatus will not introduce substances into the
                                                                                                                      system that may endanger health.
                                                                                                                        3) Backflow preventers shall be selected and installed in conformance with CSA
                                                                                                                      B64.10, “Selection and installation of backflow preventers.”

                                                                                                    2.6.2.2.          Back-Siphonage
                                                                                                                         1) Potable water connections to fixtures, tanks, vats or other devices not subject to
                                                                                                                      pressure above atmospheric and containing other than potable water shall be installed
                                                                                                                      so as to prevent back-siphonage in conformance with Sentence (2).
                                                                                                                         2) Except as provided in Sentence 2.6.2.10.(2), back-siphonage shall be prevented by
                                                                                                                      the installation of
                                                                                                                          a) an air gap,
                                                                                                                         b) an atmospheric vacuum breaker,
                                                                                                                          c) a pressure vacuum breaker,
                                                                                                                         d) a spill-resistant pressure vacuum breaker,
                                                                                                                          e) a hose connection vacuum breaker,
                                                                                                                          f) a dual check valve backflow preventer with atmospheric port,
                                                                                                                         g) a double check valve assembly,
                                                                                                                         h) a reduced pressure principle backflow preventer,
                                                                                                                          i) a dual check valve backflow preventer,
                                                                                                                           j) a laboratory faucet type vacuum breaker, or
                                                                                                                         k) a dual check valve backflow preventer with vent.


                                                                                                    2-50 Division B                                                                   National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                2.6.2.4.

                                                                                                    2.6.2.3.         Backflow Caused by Back Pressure

                                                                                                                        1) Potable water connections to fixtures, tanks, vats, boilers or other devices
                                                                                                                     containing other than potable water and subject to pressure above atmospheric shall be
                                                                                                                     arranged to prevent backflow caused by back pressure in conformance with Sentences (2)
                                                                                                                     and (3).

                                                                                                                       2) Except as provided in Article 2.6.2.4., backflow caused by back pressure of
                                                                                                                     non-toxic substances into a potable water system shall be prevented by the installation of
                                                                                                                        a) an air gap,
                                                                                                                        b) a dual check valve backflow preventer with atmospheric port,
                                                                                                                        c) a dual check valve backflow preventer,




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                        d) a dual check valve backflow preventer with vent,
                                                                                                                        e) a double check valve assembly, or
                                                                                                                        f) a reduced pressure principle backflow preventer.

                                                                                                                        3) Backflow caused by back pressure of toxic substances into a potable water system
                                                                                                                     shall be prevented by the installation of
                                                                                                                        a) an air gap, or
                                                                                                                        b) a reduced pressure principle backflow preventer.

                                                                                                    2.6.2.4.         Backflow from Fire Protection Systems

                                                                                                                        1) A backflow preventer shall not be required in residential full flow-through fire
                                                                                                                     sprinkler/standpipe systems in which the pipes and fittings are constructed of potable
                                                                                                                     water system materials.

                                                                                                                        2) Except as required by Sentence (4), potable water system connections to fire
                                                                                                                     sprinkler and standpipe systems shall be protected against backflow caused by
                                                                                                                     back-siphonage or back pressure in conformance with Clauses (a) to (g), as applicable:
                                                                                                                         a) residential partial flow-through fire sprinkler/standpipe systems in which the
                                                                                                                             pipes and fittings are constructed of potable water system materials shall be
                                                                                                                             protected by a dual check valve backflow preventer conforming to
                                                                                                                                i) CSA B64.6, “Dual check valve (DuC) backflow preventers,”
                                                                                                                                   or
                                                                                                                               ii) CSA B64.6.1, “Dual check valve backflow preventers for fire
                                                                                                                                   protection systems (DuCF),”
                                                                                                                        b) provided that the systems do not use antifreeze or other additives of any
                                                                                                                             kind and that all pipes and fittings are constructed of potable water system
                                                                                                                             materials, Class 1 fire sprinkler/standpipe systems shall be protected by a single
                                                                                                                             or dual check valve backflow preventer conforming to
                                                                                                                                i) CSA B64.6, “Dual check valve (DuC) backflow preventers,”
                                                                                                                                   or
                                                                                                                               ii) CSA B64.9, “Single check valve backflow preventers for fire
                                                                                                                                   protection systems (SCVAF),”
                                                                                                                         c) provided that the systems do not use antifreeze or other additives of any
                                                                                                                             kind, Class 1 fire sprinkler/standpipe systems not covered by Clause (b) as well
                                                                                                                             as Class 2 and Class 3 fire sprinkler/standpipe systems shall be protected by a
                                                                                                                             double check valve backflow preventer conforming to
                                                                                                                                i) CSA B64.5, “Double check valve (DCVA) backflow
                                                                                                                                   preventers,” or
                                                                                                                               ii) CSA B64.5.1, “Double check valve backflow preventers for
                                                                                                                                   fire protection systems (DCVAF),”
                                                                                                                        d) Class 1, Class 2 and Class 3 fire sprinkler/standpipe systems in which antifreeze
                                                                                                                             or other additives are used shall be protected by a reduced pressure
                                                                                                                             principle backflow preventer conforming to
                                                                                                                                i) CSA B64.4, “Reduced pressure principle (RP) backflow
                                                                                                                                   preventers,” or
                                                                                                                               ii) CSA B64.4.1, “Reduced pressure principle backflow
                                                                                                                                   preventers for fire protection systems (RPF),”
                                                                                                                             installed on the portion of the system that uses the additives and the balance
                                                                                                                             of the system shall be protected as required by Clause (b) or (c),


                                                                                                    National Plumbing Code of Canada 2020                                                                    Division B 2-51
                                                                                                    2.6.2.5.                                                                                            Division B

                                                                                                                          e) Class 4 and Class 5 fire sprinkler/standpipe systems shall be protected by a
                                                                                                                             reduced pressure principle backflow preventer conforming to
                                                                                                                                i) CSA B64.4, “Reduced pressure principle (RP) backflow
                                                                                                                                    preventers,” or
                                                                                                                               ii) CSA B64.4.1, “Reduced pressure principle backflow
                                                                                                                                    preventers for fire protection systems (RPF),”
                                                                                                                          f) Class 6 fire sprinkler/standpipe systems shall be protected by a double check
                                                                                                                             valve backflow preventer conforming to
                                                                                                                                i) CSA B64.5, “Double check valve (DCVA) backflow
                                                                                                                                    preventers,” or
                                                                                                                               ii) CSA B64.5.1, “Double check valve backflow preventers for
                                                                                                                                    fire protection systems (DCVAF),” or




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                         g) where a potentially severe health hazard may be caused by backflow, Class
                                                                                                                             6 fire sprinkler/standpipe systems shall be protected by a reduced pressure
                                                                                                                             principle backflow preventer conforming to
                                                                                                                                i) CSA B64.4, “Reduced pressure principle (RP) backflow
                                                                                                                                    preventers,” or
                                                                                                                               ii) CSA B64.4.1, “Reduced pressure principle backflow
                                                                                                                                    preventers for fire protection systems (RPF).”
                                                                                                                      (See Note A-2.6.2.4.(2).)

                                                                                                                          3) Backflow preventers required by Sentence (2) shall be installed upstream of the
                                                                                                                      fire department pumper connection. (See Note A-2.6.2.4.(3).)

                                                                                                                         4) Where a reduced pressure principle backflow preventer is required on a water
                                                                                                                      service pipe at a fire service connection located on the same premises as the fire service
                                                                                                                      pipe in Class 3, 4, 5 and 6 fire sprinkler/standpipe systems, a reduced pressure principle
                                                                                                                      backflow preventer conforming to CSA B64.4.1, “Reduced pressure principle backflow
                                                                                                                      preventers for fire protection systems (RPF),” shall also be required on the fire service
                                                                                                                      connection.

                                                                                                    2.6.2.5.          Separation of Water Supply Systems

                                                                                                                         1) Where a private water supply system or a non-potable water system is supplied by
                                                                                                                      a public water supply system, the public water supply system shall be protected in
                                                                                                                      accordance with Article 2.6.2.1.

                                                                                                    2.6.2.6.          Premise Isolation

                                                                                                                         1) In addition to the backflow preventer required by this Subsection for buildings
                                                                                                                      or facilities where a potentially severe health hazard may be caused by backflow, the
                                                                                                                      potable water system shall be provided with premise isolation by the installation of a
                                                                                                                      reduced pressure principle backflow preventer. (See Note A-2.6.2.6.(1).)

                                                                                                    2.6.2.7.          Hose Bibb

                                                                                                                         1) Where a hose bibb is installed outside a building, inside a garage or in an area
                                                                                                                      where there is an identifiable risk of contamination, the potable water system shall be
                                                                                                                      protected against backflow through the hose bibb.

                                                                                                    2.6.2.8.          Cleaning of Systems

                                                                                                                         1) A newly installed part of a potable water system shall be cleaned and then flushed
                                                                                                                      with potable water before the system is put into operation.

                                                                                                    2.6.2.9.          Air Gap

                                                                                                                         1) Air gaps shall not be located in a noxious environment.

                                                                                                                        2) Air gaps shall be not less than 25 mm high and at least twice the diameter of the
                                                                                                                      opening of the water supply outlet in height. (See Note A-2.6.2.9.(2).)


                                                                                                    2-52 Division B                                                                  National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                2.6.3.2.

                                                                                                    2.6.2.10.        Vacuum Breakers
                                                                                                                        1) Where the critical level is not marked on an atmospheric vacuum breaker, pressure
                                                                                                                     vacuum breaker, or spill-resistant pressure vacuum breaker, the critical level shall be taken
                                                                                                                     as the lowest point on the device.
                                                                                                                        2) Where an atmospheric vacuum breaker is installed, it shall be located on the
                                                                                                                     downstream side of the fixture control valve or faucet so that it will be subject to
                                                                                                                     water supply pressure
                                                                                                                         a) only when the valve or faucet is open, and
                                                                                                                        b) for periods of continuous use not exceeding 12 h.
                                                                                                                     (See Note A-2.6.2.10.(2).)




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                        3) An atmospheric vacuum breaker shall be installed so that the critical level is at
                                                                                                                     least the distance specified by the manufacturer for safe operation of the device, but
                                                                                                                     not less than 25 mm above
                                                                                                                         a) the flood level rim of a fixture or tank, or
                                                                                                                         b) the highest point open to the atmosphere in an irrigation system.
                                                                                                                        4) A pressure vacuum breaker or spill-resistant pressure vacuum breaker shall be
                                                                                                                     installed so that the critical level is not less than 300 mm above
                                                                                                                         a) the flood level rim of a fixture or tank, or
                                                                                                                         b) the highest point open to the atmosphere in an irrigation system.

                                                                                                    2.6.2.11.        Tank-Type Water Closets
                                                                                                                        1) Tank-type water closets shall be provided with a back-siphonage preventer in
                                                                                                                     conformance with Sentence 2.2.10.10.(2).

                                                                                                    2.6.2.12.        Backflow Preventers
                                                                                                                        1) No bypass piping or other device capable of reducing the effectiveness of a
                                                                                                                     backflow preventer shall be installed in a water supply system.

                                                                                                    2.6.3.           Size and Capacity of Pipes
                                                                                                                     (See Note A-2.6.3.)

                                                                                                    2.6.3.1.         Design, Fabrication and Installation
                                                                                                                     (See Note A-2.6.3.1.)
                                                                                                                        1) Water distribution systems shall be designed to provide peak demand flow when
                                                                                                                     the flow pressures at the supply openings conform to the plumbing supply fitting
                                                                                                                     manufacturer's specifications.
                                                                                                                        2) Potable water systems shall be designed, fabricated and installed in accordance
                                                                                                                     with good engineering practice, such as that described in the ASHRAE Handbooks
                                                                                                                     and ASPE Plumbing Engineering Design Handbooks. (See Note A-2.6.3.1.(2).)
                                                                                                                        3) In one- and two-family dwelling units and manufactured homes, multi-purpose
                                                                                                                     systems that combine potable water systems and residential fire sprinkler systems shall
                                                                                                                     be designed, fabricated and installed in accordance with NFPA 13D, “Standard
                                                                                                                     for the Installation of Sprinkler Systems in One- and Two-Family Dwellings and
                                                                                                                     Manufactured Homes.”

                                                                                                    2.6.3.2.         Hydraulic Load
                                                                                                                         1) Except as provided in Sentence (3), the hydraulic load of a fixture or device that
                                                                                                                     is listed in Table 2.6.3.2.-A shall be the number of fixture units given in the Table.
                                                                                                                         2) Except as provided in Sentences (1) and (3), the hydraulic load of a fixture that
                                                                                                                     is not listed in Table 2.6.3.2.-A is the number of fixture units listed in Table 2.6.3.2.-D.
                                                                                                                        3) Where fixtures are supplied with both hot and cold water, the hydraulic loads for
                                                                                                                     maximum separate demands shall be 75% of the hydraulic load of the fixture units given
                                                                                                                     in Tables 2.6.3.2.-A and 2.6.3.2.-D when using a detailed engineering design method.


                                                                                                    National Plumbing Code of Canada 2020                                                                   Division B 2-53
                                                                                                    2.6.3.2.                                                                                                                      Division B

                                                                                                                               4) The hydraulic load of urinals and water closets with direct flush valves
                                                                                                                            shall be the number of fixture units listed in Tables 2.6.3.2.-B and 2.6.3.2.-C. (See
                                                                                                                            Note A-2.6.3.2.(4).)

                                                                                                                                                                   Table 2.6.3.2.-A
                                                                                                                                                       Sizing of Water Distribution Systems (1)(2)
                                                                                                                                      Forming Part of Sentences 2.6.3.2.(1), (2) and (3), and 2.6.3.4.(2), (3) and (5)

                                                                                                                                                    Minimum Nominal          Private Use Hydraulic Load,
                                                                                                                                                                                                                 Public Use Hydraulic Load, fixture units
                                                                                                                 Fixture or Device                  Pipe Size of Supply              fixture units
                                                                                                                                                        Pipe, NPS          Cold         Hot          Total          Cold           Hot          Total




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    Bathroom group with 6 LPF flush tank (3)                n/a            2.7          1.5           3.6            n/a           n/a           n/a
                                                                                                    Bathroom group with greater than 6 LPF                  n/a              4           3            6              n/a           n/a           n/a
                                                                                                    flush tank (3)
                                                                                                                                                                                                      (4)
                                                                                                    Bathroom group with more than 3 fixtures                n/a             n/a          n/a                         n/a           n/a           n/a
                                                                                                    Bathtub with or without shower head                     ½                1            1          1.4              3             3             4
                                                                                                    Bathtub with NPS ¾ spout                                ¾               7.5          7.5          10             7.5           7.5           10
                                                                                                    Bedpan washer                                           1               n/a          n/a         n/a             7.5           7.5           10
                                                                                                    Bidet                                                   /8
                                                                                                                                                            3
                                                                                                                                                                            1.5          1.5          2             n/a           n/a            n/a
                                                                                                    Clothes washer 3.5 kg                                   ½                1           1           1.4            2.25          2.25            3
                                                                                                    Clothes washer 6.8 kg                                   ½               n/a          n/a         n/a              3             3             4
                                                                                                    Clothes washer, commercial (5)                          n/a             n/a          n/a         n/a             n/a           n/a           n/a
                                                                                                    Dental lavatory                                         3
                                                                                                                                                             /8             n/a          n/a         n/a             1.5           1.5            2
                                                                                                    Dental unit, cuspidor                                   3
                                                                                                                                                             /8             n/a          n/a         n/a              1            n/a            1
                                                                                                    Dishwasher, commercial (5)                              n/a             n/a          n/a         n/a             n/a           n/a           n/a
                                                                                                    Dishwasher, domestic                                    3
                                                                                                                                                             /8             n/a          1.4         1.4            n/a            n/a          n/a
                                                                                                    Drinking fountain or water cooler                       /8
                                                                                                                                                            3
                                                                                                                                                                            n/a          n/a         n/a            0.25           n/a          0.25
                                                                                                    Hose bibb                                               ½               2.5          n/a         2.5             2.5           n/a           2.5
                                                                                                    Hose bibb                                               ¾                3           n/a          3               6            n/a            6
                                                                                                    Hose bibb, combination hot and cold                     ½               1.9          1.9         2.5             1.9           1.9           2.5
                                                                                                    Lavatory, 8.3 LPM or less                               3
                                                                                                                                                             /8             0.5          0.5         0.7             1.5           1.5            2
                                                                                                    Lavatory, greater than 8.3 LPM                          3
                                                                                                                                                             /8             0.75        0.75          1              1.5           1.5            2
                                                                                                    Sink, bar                                               /8
                                                                                                                                                            3
                                                                                                                                                                            0.75        0.75          1              1.5           1.5            2
                                                                                                    Sink, clinic service faucet                             ½               n/a          n/a         n/a            2.25          2.25            3
                                                                                                    Sink, clinic service with direct flush valve            1               n/a          n/a         n/a              6            n/a            6
                                                                                                    Sink, kitchen commercial, per faucet                    ½               n/a          n/a         n/a              3             3             4
                                                                                                    Sink, kitchen domestic, 8.3 LPM                         3
                                                                                                                                                             /8              1            1          1.4              1             1            1.4
                                                                                                    Sink, kitchen domestic, greater than 8.3                3
                                                                                                                                                             /8             1.5          1.5          2              1.5           1.5            2
                                                                                                    LPM
                                                                                                    Sink, laboratory                                        3
                                                                                                                                                             /8             n/a          n/a         n/a             1.5           1.5            2
                                                                                                    Sink, laundry (1 or 2 compartments)                     /8
                                                                                                                                                            3
                                                                                                                                                                             1            1          1.4              1             1            1.4
                                                                                                    Sink, service or mop basin                              ½               n/a          n/a         n/a            2.25          2.25            3
                                                                                                    Sink, washup, per faucet                                ½               n/a          n/a         n/a             1.5           1.5            2
                                                                                                    Shower head, 9.5 LPM or less per head                   ½                1            1          1.4              3             3             4
                                                                                                    Shower head, greater than 9.5 LPM per                   ½               1.5          1.5          2               3             3             4
                                                                                                    head
                                                                                                                                                            (5)
                                                                                                    Shower, spray, multi-head, fixture unit per                              1           1           1.4              3             3             4
                                                                                                    head
                                                                                                                                                                             (6)                      (6)            (6)                          (6)
                                                                                                    Urinal, with direct flush valve                         ¾                            n/a                                       n/a
                                                                                                    Urinal, with flush tank                                 /8
                                                                                                                                                            3
                                                                                                                                                                             3           n/a          3               3            n/a            3
                                                                                                    Urinal, with self-closing metering valve                ½                2           n/a          2               4            n/a            4
                                                                                                    Water closet, 6 LPF or less with flush tank             3
                                                                                                                                                             /8             2.2          n/a         2.2             2.2           n/a           2.2


                                                                                                    2-54 Division B                                                                                         National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                                                  2.6.3.2.

                                                                                                                                                                    Table 2.6.3.2.-A (Continued)

                                                                                                                                                     Minimum Nominal             Private Use Hydraulic Load,
                                                                                                                                                                                                                       Public Use Hydraulic Load, fixture units
                                                                                                                   Fixture or Device                 Pipe Size of Supply                 fixture units
                                                                                                                                                         Pipe, NPS              Cold          Hot           Total         Cold           Hot            Total
                                                                                                     Water closet, greater than 6 LPF with flush               /8
                                                                                                                                                               3
                                                                                                                                                                                 3             n/a            3            5             n/a              5
                                                                                                     tank
                                                                                                                                                                                 (6)                         (6)           (6)                           (6)
                                                                                                     Water closet, with direct flush valve                     1                               n/a                                       n/a

                                                                                                    Notes to Table 2.6.3.2.-A:
                                                                                                    (1)   The fixture unit values in this Table are not applicable in certain assembly occupancies because of surges in use by the occupants. For such




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                          occupancies, refer to specific design information.
                                                                                                    (2)   For fixtures not indicated in this Table, refer to Table 2.6.3.2.-D.
                                                                                                    (3)   Bathroom group is based on an NPS ½ bathtub supply pipe.
                                                                                                    (4)   Add additional fixture to the fixture load for bathroom group.
                                                                                                    (5)   Refer to manufacturer's recommendations.
                                                                                                    (6)   For fixture unit values for fixtures with direct flush valves, see Sentence 2.6.3.2.(4) and Tables 2.6.3.2.-B and 2.6.3.2.-C.


                                                                                                                                                                    Table 2.6.3.2.-B
                                                                                                                                       Sizing of Water Distribution Systems for Urinals with Direct Flush Valves
                                                                                                                                                  Forming Part of Sentences 2.6.3.2.(4) and 2.6.3.4.(5)

                                                                                                                                                       Individual Fixture Unit Assigned in
                                                                                                                 Number of Valves                                                                            Fixture Units in Accumulative Values (1)
                                                                                                                                                               Decreasing Values
                                                                                                                         1                                              20                                                       20
                                                                                                                         2                                              15                                                       35
                                                                                                                         3                                              10                                                       45
                                                                                                                         4                                               8                                                       53
                                                                                                                     5 or more                                         5 each                          58, plus 5 for each additional fixture in excess of 5

                                                                                                    Notes to Table 2.6.3.2.-B:
                                                                                                    (1)   The accumulative fixture unit values are the total values to be used in conjunction with Table 2.6.3.2.-A.


                                                                                                                                                                  Table 2.6.3.2.-C
                                                                                                                                  Sizing of Water Distribution Systems for Water Closets with Direct Flush Valves
                                                                                                                                                Forming Part of Sentences 2.6.3.2.(4) and 2.6.3.4.(5)

                                                                                                                                                       Individual Fixture Unit Assigned in
                                                                                                                 Number of Valves                                                                            Fixture Units in Accumulative Values (1)
                                                                                                                                                               Decreasing Values
                                                                                                                         1                                              40                                                       40
                                                                                                                         2                                              30                                                       70
                                                                                                                         3                                              20                                                       90
                                                                                                                         4                                              15                                                       105
                                                                                                                                                                                                               115, plus 10 for each public use
                                                                                                                                                            10 for each public use                              additional fixture in excess of 5
                                                                                                                     5 or more                                        and                                                       and
                                                                                                                                                             6 for each private use                        111, plus 6 for each private use additional
                                                                                                                                                                                                                      fixture in excess of 5

                                                                                                    Notes to Table 2.6.3.2.-C:
                                                                                                    (1)   The accumulative fixture unit values are the total values to be used in conjunction with Table 2.6.3.2.-A.




                                                                                                    National Plumbing Code of Canada 2020                                                                                                      Division B 2-55
                                                                                                    2.6.3.3.                                                                                                                          Division B

                                                                                                                                                                    Table 2.6.3.2.-D
                                                                                                                                               Hydraulic Loads of Fixtures Not Listed in Table 2.6.3.2.-A
                                                                                                                                               Forming Part of Sentences 2.6.3.2.(2) and (3) and 2.6.3.4.(5)

                                                                                                                                                                                              Hydraulic Load, fixture units
                                                                                                          Nominal Pipe Size of Supply Pipe, NPS
                                                                                                                                                                            Private Use                                       Public Use
                                                                                                                             /8
                                                                                                                              3
                                                                                                                                                                                  1                                               2
                                                                                                                             ½                                                    2                                               4
                                                                                                                             ¾                                                    3                                               6
                                                                                                                             1                                                    6                                              10




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    2.6.3.3.                Static Pressure

                                                                                                                               1) Where the static pressure at any fixture may exceed 550 kPa, a pressure-reducing
                                                                                                                            valve shall be installed to limit the maximum static pressure at the fixture to 550 kPa.

                                                                                                    2.6.3.4.                Size

                                                                                                                               1) Water service pipes shall be sized according to the peak demand flow but shall
                                                                                                                            not be less than NPS ¾.

                                                                                                                               2) Except as provided in Sentence (3), the nominal pipe size of a supply pipe that
                                                                                                                            serves a fixture shall conform to Table 2.6.3.2.-A.

                                                                                                                               3) For fixtures listed in Table 2.6.3.2.-A that are permitted to have an NPS ⅜ supply
                                                                                                                            pipe, a connector not more than 750 mm long and not less than NPS ¼ may be used
                                                                                                                            to supply water to the fixture.

                                                                                                                               4) No water system between the point of connection with the water service pipe or
                                                                                                                            the water meter and the first water distribution pipe that supplies a water heater that
                                                                                                                            serves more than one fixture shall be sized less than NPS ¾.

                                                                                                                               5) Where both hot and cold water is supplied to fixtures in residential buildings
                                                                                                                            containing one or two dwelling units or row houses with separate water service pipes, the
                                                                                                                            water system may be sized in accordance with Table 2.6.3.4., where
                                                                                                                               a) the hydraulic loads for maximum separate demands on water distribution
                                                                                                                                    system piping are not less than 100% of the total hydraulic load of the fixture
                                                                                                                                    units given in Table 2.6.3.2.-A, 2.6.3.2.-B, 2.6.3.2.-C or 2.6.3.2.-D for private
                                                                                                                                    use,
                                                                                                                               b) the minimum water pressure at the entry to the building is 200 kPa, and
                                                                                                                                c) the total maximum length of the water system is 90 m.
                                                                                                                            (See Note A-2.6.3.4.(5).)


                                                                                                                                                              Table 2.6.3.4.
                                                                                                          Water Pipe Sizing for Buildings Containing One or Two Dwelling Units or Row Houses with Separate Water Service Pipes
                                                                                                                                                    Forming Part of Sentence 2.6.3.4.(5)

                                                                                                                                                                                            Water Velocity, m/s (1)
                                                                                                          Nominal Pipe Size of Water
                                                                                                                                                              3.0                                   2.4                                1.5
                                                                                                                  Pipe, NPS
                                                                                                                                                                                        Hydraulic Load, fixture units
                                                                                                                       ½                                       8                                     7                                  4
                                                                                                                       ¾                                      21                                    16                                  9
                                                                                                                        1                                     43                                    31                                 18
                                                                                                                       1¼                                     83                                    57                                 30

                                                                                                    Notes to Table 2.6.3.4.:
                                                                                                    (1)   Table 2.6.3.4. is not intended to limit water velocities that are permitted by Sentence 2.6.3.5.(1).


                                                                                                    2-56 Division B                                                                                               National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                              2.7.2.1.

                                                                                                    2.6.3.5.         Velocity
                                                                                                                        1) The maximum permitted water velocities shall be those recommended by the
                                                                                                                     pipe and fitting manufacturer.


                                                                                                    Section 2.7. Non-Potable Water Systems
                                                                                                    2.7.1.           Non-Potable Water Systems
                                                                                                    2.7.1.1.         General




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                     (See Note A-2.7.1.1.)
                                                                                                                        1) Non-potable water systems shall be designed, fabricated and installed in
                                                                                                                     accordance with this Subsection and good engineering practice. (See Note A-2.7.1.1.(1).)
                                                                                                                        2) Except as provided in Sentence (3) and Subsection 2.7.2., non-potable water
                                                                                                                     systems shall only be used to supply water closets, urinals, trap seal primers, and
                                                                                                                     directly connected underground irrigation systems that only dispense water below
                                                                                                                     the surface of the ground.
                                                                                                                        3) Non-potable water systems shall not be used to supply fixtures in healthcare
                                                                                                                     facilities.
                                                                                                                        4) Where a non-potable water system is supplied by a potable water system, the potable
                                                                                                                     water system shall be protected in accordance with Article 2.6.2.1.
                                                                                                                        5) Where the static pressure at any fixture in a non-potable water system may exceed
                                                                                                                     550 kPa, a pressure-reducing valve shall be installed to limit the maximum static
                                                                                                                     pressure at the fixture to 550 kPa.

                                                                                                    2.7.1.2.         Identification and Marking
                                                                                                                        1) Non-potable water piping and outlets shall be identified and marked in
                                                                                                                     accordance with CAN/CSA-B128.1, “Design and Installation of Non-Potable Water
                                                                                                                     Systems.”

                                                                                                    2.7.1.3.         Location of Pipes
                                                                                                                        1) Non-potable water piping shall not be located directly above
                                                                                                                        a) areas where food, drink or products that are intended for human
                                                                                                                           consumption are prepared, handled, dispensed or stored, or
                                                                                                                        b) a non-pressurized or pressurized potable water tank.

                                                                                                    2.7.1.4.         Location of Outlets
                                                                                                                        1) Except as provided in Subsection 2.7.2., an outlet from a non-potable water
                                                                                                                     system shall not be located where it can discharge into
                                                                                                                         a) a fixture into which an outlet from a potable water system is discharged, or
                                                                                                                         b) a fixture that is used for the preparation, handling or dispensing of food,
                                                                                                                            drink or products that are intended for human consumption.

                                                                                                    2.7.2.           Non-Potable Rainwater Harvesting Systems
                                                                                                    2.7.2.1.         General
                                                                                                                        1) For the purposes of this Subsection, rainwater shall mean storm water discharged
                                                                                                                     from an above-ground roof surface. (See Note A-2.7.2.1.(1).)
                                                                                                                        2) For the purposes of this Subsection, a non-potable rainwater harvesting system
                                                                                                                     shall mean a storage tank, a pump, pipes, fittings and other plumbing appurtenances
                                                                                                                     used to collect and distribute rainwater, but shall not include a rain barrel not
                                                                                                                     connected to a plumbing system.


                                                                                                    National Plumbing Code of Canada 2020                                                                  Division B 2-57
                                                                                                    2.7.2.2.                                                                                            Division B

                                                                                                    2.7.2.2.          Permitted Applications

                                                                                                                         1)  Non-potable rainwater harvesting systems are only permitted to supply
                                                                                                                         a)  water closets and urinals,
                                                                                                                         b)  clothes washers,
                                                                                                                         c)  floor-mounted service sinks and laundry trays,
                                                                                                                         d)  trap primers,
                                                                                                                         e)  irrigation systems,
                                                                                                                          f) hydronic systems,
                                                                                                                         g)  make-up water systems for heat rejection systems, or
                                                                                                                         h)  any other application where the harvested rainwater is not expected to be
                                                                                                                             ingested or inhaled.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                      (See Note A-2.7.2.2.(1) and 2.7.2.4.(3) and (4).)

                                                                                                    2.7.2.3.          Roof Design

                                                                                                                         1) Roof surfaces that supply rainwater to a non-potable rainwater harvesting
                                                                                                                      system shall be inaccessible to vehicular and pedestrian traffic. (See Note A-2.7.2.3.(1).)

                                                                                                                         2) Roofing components and conveyance systems in contact with rainwater that is
                                                                                                                      supplied to a non-potable rainwater harvesting system shall be constructed of materials
                                                                                                                      that will not introduce substances into the rainwater that could adversely affect its
                                                                                                                      intended end use. (See Note A-2.7.2.3.(2).)

                                                                                                    2.7.2.4.          Non-Potable Rainwater Harvesting System Design

                                                                                                                         1) Non-potable rainwater harvesting systems and their connections shall be
                                                                                                                      designed, fabricated and installed in accordance with this Subsection and good
                                                                                                                      engineering practice. (See Note A-2.7.2.4.(1).)

                                                                                                                         2) Non-potable rainwater harvesting systems shall not collect water discharged
                                                                                                                      from an evaporative heat rejection system.

                                                                                                                          3) Non-potable rainwater harvesting systems shall be provided with a means
                                                                                                                      to treat the harvested rainwater in such a manner that the quality of the delivered
                                                                                                                      non-potable water conforms to appropriate provincial or territorial requirements or,
                                                                                                                      in the absence of such requirements, the systems shall conform to Sentence (4). (See
                                                                                                                      Note A-2.7.2.2.(1) and 2.7.2.4.(3) and (4).)

                                                                                                                         4) Except as provided in Sentence (3), non-potable rainwater harvesting systems
                                                                                                                      shall be provided with
                                                                                                                          a) a water treatment system consisting of
                                                                                                                                 i) a debris screen with a mesh size of not more than 6 mm
                                                                                                                                    ahead of the storage tank inlet,
                                                                                                                                ii) a first-flush diversion system with a capacity of not less
                                                                                                                                    than 0.3 L/m2 of roof area ahead of the storage tank inlet,
                                                                                                                               iii) a calming inlet or settling chamber ahead of the storage
                                                                                                                                    tank inlet,
                                                                                                                               iv) a device to prevent the entrainment of sediment into the
                                                                                                                                    pump, and
                                                                                                                                v) where the harvested rainwater is used for an indoor
                                                                                                                                    application, a filter with a mesh size of not more than 50 μm
                                                                                                                                    ahead of the storage tank inlet, or
                                                                                                                         b) a means to treat the harvested rainwater in such a manner that the delivered
                                                                                                                              non-potable water contains not more than the maximum acceptable levels of
                                                                                                                              contaminants stated in CSA B805/ICC 805, “Rainwater harvesting systems.”
                                                                                                                      (See Note A-2.7.2.2.(1) and 2.7.2.4.(3) and (4).)

                                                                                                                         5) Where the static pressure at any fixture in a non-potable rainwater harvesting
                                                                                                                      system may exceed 550 kPa, a pressure-reducing valve shall be installed to limit the
                                                                                                                      maximum static pressure at the fixture to 550 kPa.


                                                                                                    2-58 Division B                                                                  National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                                  2.8.1.1.

                                                                                                                           6) Storage tanks in non-potable rainwater harvesting systems shall be designed
                                                                                                                         and installed in accordance with
                                                                                                                            a) CAN/CSA-B126.0, “General requirements and methods of testing for water
                                                                                                                                cisterns,” and
                                                                                                                            b) CAN/CSA-B126.1, “Installation of water cisterns.”
                                                                                                                            7) Storage tanks in non-potable rainwater harvesting systems shall be equipped
                                                                                                                         with an overflow that directs excess rainwater to
                                                                                                                            a) a public storm sewer,
                                                                                                                            b) a public combined sewer,
                                                                                                                            c) a storm water management system, or
                                                                                                                            d) a designated storm water disposal location.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                            8) Where the storage tank outlet is located below the level of the adjoining street,
                                                                                                                         the storage tank overflow required by Sentence (7) shall
                                                                                                                             a) terminate with an indirect connection that is not located within the building,
                                                                                                                                 or
                                                                                                                            b) be equipped with a backwater valve.
                                                                                                                             9) Make-up water connections to non-potable rainwater harvesting systems shall
                                                                                                                             a) be equipped with a reduced pressure principle backflow preventer, or
                                                                                                                             b) have an air gap.
                                                                                                                          10) Where a fixture combines water from a non-potable rainwater harvesting system
                                                                                                                         and potable water at the fixture supply fitting, the potable water system shall be protected
                                                                                                                         by a backflow preventer as described in Sentence 2.6.2.1.(3).


                                                                                                    Section 2.8. Objectives and Functional Statements
                                                                                                    2.8.1.               Objectives and Functional Statements
                                                                                                    2.8.1.1.             Attribution to Acceptable Solutions
                                                                                                                             1) For the purposes of compliance with this Code as required in
                                                                                                                         Clause 1.2.1.1.(1)(b) of Division A, the objectives and functional statements attributed
                                                                                                                         to the acceptable solutions in this Part shall be the objectives and functional statements
                                                                                                                         listed in Table 2.8.1.1. (See Note A-1.1.2.1.(1).)

                                                                                                                          Table 2.8.1.1.                                                      Table 2.8.1.1. (Continued)
                                                                                                      Objectives and Functional Statements Attributed to the
                                                                                                                  Acceptable Solutions in Part 2                           Provision           Functional Statements and Objectives (1)
                                                                                                                Forming Part of Sentence 2.8.1.1.(1)                       2.1.3.2. Accessibility
                                                                                                     Provision           Functional Statements and Objectives (1)          (1)         [F40-OH2.1] [F41-OH2.4] [F71-OH2.3]
                                                                                                    2.1.2.1. Sanitary Drainage Systems                                                 [F82-OH2.1,OH2.2,OH2.3,OH2.4]
                                                                                                    (1)          [F72-OH2.1]                                                           [F71-OH2.3] [F81-OH2.4]
                                                                                                    (2)          [F72-OH2.1]                                                           [F81-OP5]
                                                                                                                 [F72-OP5]                                                 2.1.4.1. Seismic Restraints and Design
                                                                                                    2.1.2.2. Storm Drainage Systems                                        (1)         [F20-OS2.1]
                                                                                                    (1)          [F72-OP5]                                                 2.2.1.1. Exposure of Materials
                                                                                                    2.1.2.3. Water Distribution Systems                                    (1)         [F80-OH2.1,OH2.2,OH2.3,OH2.4]
                                                                                                    (1)          [F46-OH2.2]                                                           [F80-OP5]
                                                                                                    2.1.2.4. Separate Services                                             (2)         [F80-OH2.1]
                                                                                                    (1)          [F71-OH2.1,OH2.3] [F70-OH2.1]                                         [F80-OP5]
                                                                                                    2.1.3.1. Lighting and Ventilation Requirements                         2.2.1.2. Restrictions on Re-Use
                                                                                                    (1)          [F40-OH1.1] Applies to the requirement for ventilation.   (1)         [F70-OH2.2]
                                                                                                                 [F30-OS3.1] Applies to the requirement for lighting.


                                                                                                    National Plumbing Code of Canada 2020                                                                                     Division B 2-59
                                                                                                    2.8.1.1.                                                                                                        Division B

                                                                                                                       Table 2.8.1.1. (Continued)                                     Table 2.8.1.1. (Continued)

                                                                                                     Provision          Functional Statements and Objectives (1)   Provision             Functional Statements and Objectives (1)
                                                                                                    2.2.1.5. Withstanding Pressure                                 (2)         [F81-OH2.1,OH2.4]
                                                                                                    (1)          [F20,F81-OH2.1,OH2.3] [F46-OH2.2]                             [F81-OP5]
                                                                                                                 [F20-OP5]                                         2.2.4.3. 90° Elbows
                                                                                                    2.2.1.6. Working Pressure of a Water Service Pipe              (1)         [F81-OH2.1,OH2.4]
                                                                                                    (1)          [F20,F81-OH2.3]                                   (2)         [F81-OH2.1,OH2.4]
                                                                                                                 [F20-OP5]                                         2.2.5.1. Fibrocement Pipe and Fittings




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    2.2.2.1. Surface Requirements                                  (1)         [F20-OH2.1]
                                                                                                    (1)          [F41-OH2.4]                                                   [F20-OP5]
                                                                                                    2.2.2.2. Conformance to Standards                              2.2.5.2. Concrete Pipe and Fittings
                                                                                                    (1)          [F80-OH2.1,OH2.4]                                 (1)         [F20-OH2.1]
                                                                                                                 [F80-OS3.1,OS3.2]                                 (2)         [F20-OH2.1]
                                                                                                    2.2.2.3. Showers                                               (3)         [F20-OH2.1]
                                                                                                    (1)          [F80-OH2.1]                                       (4)         [F20-OH2.1]
                                                                                                                 [F80-OP5]                                         (5)         [F20-OH2.1]
                                                                                                    (2)          [F80-OH2.1]                                       2.2.5.3. Vitrified Clay Pipe and Fittings
                                                                                                                 [F40-OP5]                                         (1)         [F20-OH2.1]
                                                                                                    (3)          [F45-OH2.1]                                       (2)         [F20-OH2.1]
                                                                                                    (4)          [F45-OH2.1]                                       (3)         [F20-OH2.1]
                                                                                                    2.2.2.4. Concealed Overflows                                   2.2.5.4. Polyethylene Pipe and Fittings
                                                                                                    (1)          [F41,F81-OH2.1,OH2.4]                             (1)         [F20-OH2.1,OH2.2,OH2.3]
                                                                                                    2.2.2.5. Water Closets in Public Washrooms                                 [F20-OP5]
                                                                                                    (1)          [F30-OH2.1,OH2.4]                                 (2)         [F20-OP5]
                                                                                                    2.2.3.1. Traps                                                 (3)         [F20-OP5]
                                                                                                    (1)          [F81,F40-OH1.1]                                   2.2.5.5. Polyethylene Pipe Used Underground
                                                                                                    (2)          [F81-OH1.1]                                       (1)         [F72-OH2.1,OH2.3]
                                                                                                                 [F81-OP5]                                         2.2.5.6. Crosslinked Polyethylene Pipe and Fittings
                                                                                                    (3)          [F81-OH2.1,OH2.3,OH2.4]                           (1)         [F20-OH2.2]
                                                                                                                 [F81-OP5]                                                     [F20-OP5]
                                                                                                    (4)          [F81-OH1.1]                                       2.2.5.7. PVC Pipe and Fittings
                                                                                                    (5)          [F81-OH1.1]                                       (1)         [F20-OH2.1,OH2.2,OH2.3]
                                                                                                    2.2.3.2. Interceptors                                                      [F20-OP5]
                                                                                                    (1)          [F81-OH2.1,OH2.3,OH2.4]                           (2)         [F20-OH2.1,OH2.2,OH2.3]
                                                                                                    (2)          [F81-OH2.1,OH2.3,OH2.4] [F46-OH2.2]                           [F20-OP5]
                                                                                                    (3)          [F81-OH2.1]                                       (3)         [F20-OH2.1,OH2.2,OH2.3]
                                                                                                                 [F81-OP5]                                                     [F20-OP5]
                                                                                                    2.2.3.3. Tubular Traps                                         (4)         [F20-OP5]
                                                                                                    (1)          [F82-OH2.1,OH2.4]                                 2.2.5.8. CPVC Pipe, Fittings and Solvent Cements
                                                                                                                 [F82-OP5]                                         (1)         [F20-OH2.2,OH2.3,OH2.4]
                                                                                                    2.2.4.1. T and Cross Fittings                                              [F20-OP5]
                                                                                                    (1)          [F81-OH2.1,OH2.4]                                 (2)         [F20-OP5]
                                                                                                    (2)          [F81-OH2.1,OH2.4]
                                                                                                    2.2.4.2. Sanitary T Fittings
                                                                                                    (1)          [F81-OH2.1,OH2.4]



                                                                                                    2-60 Division B                                                                         National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                               2.8.1.1.

                                                                                                                       Table 2.8.1.1. (Continued)                                          Table 2.8.1.1. (Continued)

                                                                                                     Provision          Functional Statements and Objectives (1)     Provision              Functional Statements and Objectives (1)
                                                                                                    2.2.5.9. Plastic Pipe, Fittings and Solvent Cement Used          2.2.6.3. Threaded Cast-Iron Drainage Fittings
                                                                                                    Underground
                                                                                                                                                                     (1)         [F20-OH2.1,OH2.3]
                                                                                                    (1)          [F20,F80,F81-OH2.1]
                                                                                                                                                                     (2)         [F20-OP5]
                                                                                                                 [F20,F80,F81-OP5]
                                                                                                                                                                     2.2.6.4. Cast-Iron Water Pipes
                                                                                                    2.2.5.10. Transition Solvent Cement
                                                                                                                                                                     (1)         [F20-OP5]
                                                                                                    (1)          [F20,F80,F81-OH2.1,OH2.3]
                                                                                                                                                                                 [F20-OH2.1,OH2.2,OH2.3]




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    (2)          [F20,F80,F81-OH2.1,OH2.3]
                                                                                                                                                                     (2)         [F80-OH2.2]
                                                                                                    2.2.5.11. Plastic Pipe, Fittings and Solvent Cement Used in
                                                                                                                                                                     (3)         [F20-OP5]
                                                                                                    Buildings
                                                                                                                                                                     (4)         [F20-OP5]
                                                                                                    (1)          [F20,F80,F81-OH2.1,OH2.3]
                                                                                                                                                                     2.2.6.5. Screwed Cast-Iron Water Fittings
                                                                                                    2.2.5.12. Polyethylene/Aluminum/Polyethylene Composite Pipe
                                                                                                    and Fittings                                                     (1)         [F20-OP5]
                                                                                                    (1)          [F20,F80,F81-OH2.1,OH2.2,OH2.3]                     (2)         [F80-OH2.2]
                                                                                                                 [F20-OP5]                                           (3)         [F81-OH2.1,OH2.3]
                                                                                                    (2)          [F20-OP5]                                           2.2.6.6. Screwed Malleable-Iron Water Fittings
                                                                                                                 [F20-OH2.1,OH2.2,OH2.3]                             (1)         [F81-OP5]
                                                                                                    (3)          [F20-OP5]                                           (2)         [F80-OH2.2]
                                                                                                                 [F20-OH2.1,OH2.2,OH2.3]                             (3)         [F81-OH2.1,OH2.3]
                                                                                                    (4)          [F20-OP5]                                           2.2.6.7. Steel Pipe
                                                                                                                 [F20-OH2.1,OH2.2,OH2.3]                             (1)         [F80-OH2.1,OH2.3] [F46-OH2.2]
                                                                                                    2.2.5.13. Crosslinked Polyethylene/Aluminum/Crosslinked          (3)         [F46-OH2.2]
                                                                                                    Polyethylene Composite Pressure Pipe and Fittings
                                                                                                                                                                     (4)         [F80-OH2.1,OH2.3]
                                                                                                    (1)          [F20-OH2.1,OH2.2,OH2.3]
                                                                                                                                                                                 [F80-OP5]
                                                                                                                 [F20-OP5]
                                                                                                                                                                     2.2.6.8. Corrugated Steel Pipe and Couplings
                                                                                                    2.2.5.14. Polypropylene Pipe and Fittings
                                                                                                                                                                     (1)         [F80-OP5]
                                                                                                    (1)          [F20-OH2.1,OH2.2,OH2.3]
                                                                                                                                                                     (2)         [F81-OP5]
                                                                                                                 [F20-OP5]
                                                                                                                                                                     (3)         [F81-OP5]
                                                                                                    2.2.5.15. Polyethylene of Raised Temperature Tube and Fittings
                                                                                                                                                                     2.2.6.9. Sheet Metal Leaders
                                                                                                    (1)          [F20,F70,F80-OH2.2]
                                                                                                                                                                     (1)         [F80-OP5]
                                                                                                                 [F20,F70,F80-OP5]
                                                                                                                                                                     2.2.6.10. Stainless Steel Pipe
                                                                                                    (2)          [F80,F81-OH2.1]
                                                                                                                                                                     (1)         [F80-OH2.1] Applies to drainage systems and venting
                                                                                                                 [F20,F70,F80-OP5]                                               systems.
                                                                                                    2.2.5.16. Cellular Core PVC Pipe and Fittings                                [F46,F80-OH2.2] Applies to water systems.

                                                                                                    (1)          [F20-OH2.1,OH2.2,OH2.3]                                         [F80-OP5]

                                                                                                                 [F20-OP5]                                           (2)         [F80-OH2.1] Applies to drainage systems and venting
                                                                                                                                                                                 systems.
                                                                                                    (2)          [F20-OH2.1]                                                     [F46,F80-OH2.2] Applies to water systems.
                                                                                                                 [F20-OP5]                                                       [F80-OP5]
                                                                                                    2.2.6.1. Cast-Iron Drainage and Vent Pipe and Fittings           2.2.6.11. Stainless Steel Butt Weld Pipe Fittings
                                                                                                    (1)          [F20-OH2.1,OH2.3]                                   (1)         [F80-OH2.1] Applies to drainage systems and venting
                                                                                                    (2)          [F20-OH2.2]                                                     systems.
                                                                                                                                                                                 [F46,F80-OH2.2] Applies to water systems.
                                                                                                    2.2.6.2. Maintenance Holes and Catch Basins
                                                                                                                                                                                 [F80-OP5]
                                                                                                    (1)          [F81-OH1.1]
                                                                                                                 [F20-OS3.1]




                                                                                                    National Plumbing Code of Canada 2020                                                                                  Division B 2-61
                                                                                                    2.8.1.1.                                                                                                          Division B

                                                                                                                       Table 2.8.1.1. (Continued)                                        Table 2.8.1.1. (Continued)

                                                                                                     Provision          Functional Statements and Objectives (1)       Provision           Functional Statements and Objectives (1)
                                                                                                    (2)          [F80-OH2.1] Applies to drainage systems and venting   2.2.7.4. Copper Tube
                                                                                                                 systems.
                                                                                                                                                                       (1)         [F80-OH2.1,OH2.3] Applies to drainage systems and
                                                                                                                 [F46,F80-OH2.2] Applies to water systems.
                                                                                                                                                                                   venting systems.
                                                                                                                 [F80-OP5]                                                         [F46-OH2.2] Applies to water systems.
                                                                                                    2.2.6.12. Stainless Steel Pipe Flanges                                         [F80-OP5]
                                                                                                    (1)          [F80-OH2.1] Applies to drainage systems and venting   (2)         [F80-OH2.1,OH2.2,OH2.3]
                                                                                                                 systems.
                                                                                                                                                                       (3)         [F80-OH2.1,OH2.3,OH2.4]




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                 [F46,F80-OH2.2] Applies to water systems.
                                                                                                                                                                       2.2.7.5. Solder-Joint Drainage Fittings
                                                                                                                 [F80-OP5]
                                                                                                                                                                       (1)         [F80-OH2.1,OH2.4]
                                                                                                    (2)          [F80-OH2.1] Applies to drainage systems and venting
                                                                                                                 systems.                                              (2)         [F20-OP5]
                                                                                                                 [F46,F80-OH2.2] Applies to water systems.             2.2.7.6. Solder-Joint Water Fittings
                                                                                                                 [F80-OP5]
                                                                                                                                                                       (1)         [F20-OP5]
                                                                                                    2.2.6.13. Stainless Steel Threaded Fittings
                                                                                                                                                                       (2)         [F20-OP5]
                                                                                                    (1)          [F80-OH2.1] Applies to drainage systems and venting   2.2.7.7. Flared-Joint Fittings for Copper Water Systems
                                                                                                                 systems.
                                                                                                                 [F46,F80-OH2.2] Applies to water systems.             (1)         [F20-OP5]
                                                                                                                 [F20-OP5]                                             (2)         [F20-OP5]
                                                                                                    (2)          [F80-OH2.1] Applies to drainage systems and venting   2.2.7.8. Lead Waste Pipe and Fittings
                                                                                                                 systems.                                              (1)         [F46,F20-OH2.2,OH2.3]
                                                                                                                 [F46,F80-OH2.2] Applies to water systems.
                                                                                                                                                                       (2)         [F81-OH2.1,OH2.3,OH2.4]
                                                                                                                 [F20-OP5]
                                                                                                                                                                       2.2.8.1. Pipes and Fittings
                                                                                                    2.2.6.14. Stainless Steel Tube
                                                                                                                                                                       (1)         [F80,F81-OH2.1]
                                                                                                    (1)          [F46-OH2.2]
                                                                                                                                                                                   [F80,F81-OS3.2,OS3.4]
                                                                                                                 [F80-OP5]
                                                                                                                                                                       2.2.9.1. Cement Mortar
                                                                                                    (2)          [F46-OH2.2]
                                                                                                                                                                       (1)         [F80-OP5]
                                                                                                                 [F80-OP5]
                                                                                                                                                                                   [F80-OH2.1,OH2.3]
                                                                                                    2.2.6.15. Stainless Steel Pipe and Tube
                                                                                                                                                                       2.2.9.2. Solders and Fluxes
                                                                                                    (1)          [F80-OH2.1,OH2.2,OH2.3]
                                                                                                                                                                       (1)         [F80-OP5]
                                                                                                    2.2.7.1. Copper and Brass Pipe
                                                                                                                                                                                   [F80-OH2.1,OH2.3]
                                                                                                    (1)          [F80-OH2.1,OH2.3] Applies to drainage systems and
                                                                                                                 venting systems.                                      (2)         [F46-OH2.2]
                                                                                                                 [F46-OH2.2] Applies to water systems.                 (3)         [F80-OH2.1,OH2.3]
                                                                                                                 [F80-OP5]                                             (4)         [F20,F80,F81-OH2.1,OH2.3]
                                                                                                    (2)          [F80-OH2.1,OH2.3] Applies to drainage systems and     2.2.10.1. Brass Floor Flanges
                                                                                                                 venting systems.
                                                                                                                 [F46-OH2.2] Applies to water systems.                 (1)         [F80-OH2.1]
                                                                                                                 [F80-OP5]                                             2.2.10.2. Screws, Bolts, Nuts and Washers
                                                                                                    2.2.7.2. Brass or Bronze Pipe Flanges and Flanged Fittings         (1)         [F80-OH2.1,OH2.3]
                                                                                                    (1)          [F80-OH2.1,OH2.3] Applies to drainage systems and     2.2.10.3. Cleanout Fittings
                                                                                                                 venting systems.                                      (1)         [F80-OH2.1,OH2.3] Applies to drainage systems.
                                                                                                                 [F46-OH2.2] Applies to water systems.                             [F46-OH2.2] Applies to water systems.
                                                                                                                 [F80-OP5]                                             (2)         [F80-OH2.1]
                                                                                                    2.2.7.3. Brass or Bronze Threaded Water Fittings                   2.2.10.4. Mechanical Couplings
                                                                                                    (1)          [F80-OP5]                                             (1)         [F80-OP5]
                                                                                                    (2)          [F80-OH2.1,OH2.3]                                     (2)         [F80-OH2.1,OH2.3]




                                                                                                    2-62 Division B                                                                             National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                            2.8.1.1.

                                                                                                                       Table 2.8.1.1. (Continued)                                     Table 2.8.1.1. (Continued)

                                                                                                     Provision           Functional Statements and Objectives (1)   Provision           Functional Statements and Objectives (1)
                                                                                                    2.2.10.5. Saddle Hubs                                           2.2.10.17. Water Treatment Systems
                                                                                                    (1)          [F81-OH2.1,OH2.3]                                  (1)         [F46-OH2.2]
                                                                                                                 [F81-OP5]                                                      [F30-OS3.1]
                                                                                                                                                                                [F46,F70-OS3.4]
                                                                                                    2.2.10.6. Valves, and Supply and Waste Fittings
                                                                                                                                                                                [F20,F30-OS2.1]
                                                                                                    (1)          [F80-OP5]
                                                                                                                                                                    2.2.10.18. Flexible Water Connectors
                                                                                                    (2)          [F131-OE1.2]




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                    (1)         [F81-OP5]
                                                                                                    (3)          [F30-OS3.1]
                                                                                                                                                                                [F46-OH2.2]
                                                                                                                 [F31-OS3.2]
                                                                                                                                                                    2.3.2.1. Caulked Lead Drainage Joints
                                                                                                    (4)          [F131-OE1.2]
                                                                                                    (5)          [F131-OE1.2]                                       (1)         [F80-OH2.1,OH2.3]

                                                                                                    (6)          [F80-OH2.1,OH2.3]                                  (2)         [F80-OH2.1]

                                                                                                    (7)          [F81-OP5]                                          (3)         [F81-OH2.1]

                                                                                                                 [F46-OH2.2]                                        (4)         [F81-OH2.1]

                                                                                                    2.2.10.7. Water Temperature Control                             2.3.2.2. Wiped Joints

                                                                                                    (1)          [F31-OS3.2]                                        (1)         [F80,F81-OH2.1]

                                                                                                    (4)          [F31-OS3.2]                                                    [F80,F81-OP5]

                                                                                                    (5)          [F31-OS3.2]                                        (2)         [F80,F81-OH2.1,OH2.2,OH2.3]

                                                                                                    2.2.10.8. Direct Flush Valves                                   (3)         [F80,F81-OH2.1,OH2.2,OH2.3]
                                                                                                                                                                    2.3.2.3. Screwed Joints
                                                                                                    (1)          [F81-OH2.1]
                                                                                                                 (a),(b),(e) [F81-OP5]                              (1)         [F80,F81-OH2.1,OH2.2,OH2.3]

                                                                                                    2.2.10.9. Drinking Fountain Bubblers                            (2)         [F70-OH2.2]
                                                                                                                                                                    2.3.2.4. Soldered Joints
                                                                                                    (1)          [F40,F46-OH2.4]
                                                                                                    (2)          [F41,F46-OH2.2]                                    (1)         [F20,F81-OH2.1,OH2.2,OH2.3]

                                                                                                    (3)          [F41,F46-OH2.2]                                    2.3.2.5. Flared Joints

                                                                                                    2.2.10.10. Back-Siphonage Preventers and Backflow Preventers    (1)         [F20,F81-OH2.1,OH2.2,OH2.3]

                                                                                                    (1)          [F46-OH2.2]                                                    [F20,F81-OP5]

                                                                                                    (2)          [F46-OH2.2]                                        (2)         [F20,F81-OH2.1,OH2.2,OH2.3]

                                                                                                    2.2.10.11. Relief Valves                                                    [F20,F81-OP5]
                                                                                                                                                                    2.3.2.6. Mechanical Joints
                                                                                                    (1)          [F31-OS3.2]
                                                                                                                 [F31-OP5]                                          (1)         [F20-OH2.1,OH2.2,OH2.3]

                                                                                                    2.2.10.12. Reducing Valves                                                  [F20-OP5]
                                                                                                                                                                    2.3.2.7. Cold-Caulked Joints
                                                                                                    (1)          [F81-OP5]
                                                                                                    2.2.10.13. Solar Domestic Hot Water                             (1)         [F20,F81-OH1.1] Applies to bell and spigot joints in
                                                                                                                                                                                venting systems.
                                                                                                    (1)          [F81-OS3.2]
                                                                                                                                                                                [F20,F81-OH2.1,OH2.3] Applies to bell and spigot joints
                                                                                                                 [F46-OH2.2]                                                    in drainage systems or venting systems.
                                                                                                                 [F80,F81-OP5]                                                  [F20,F81-OP5]
                                                                                                    2.2.10.14. Vent Pipe Flashing                                   (2)         [F20,F81-OH1.1]
                                                                                                    (1)          [F80,F81-OP5]                                                  [F20,F81-OP5]
                                                                                                    (2)          [F80,F81-OP5]                                                  [F20,F81-OH2.1,OH2.2,OH2.3]
                                                                                                    2.2.10.15. Water Hammer Arresters                               (3)         [F20-OH2.1,OH2.3]
                                                                                                    (1)          [F20,F80-OP5]                                      2.3.2.8. Stainless Steel Welded Joints
                                                                                                    2.2.10.16. Air Admittance Valves                                (1)         [F20,F81-OH2.1,OH2.2,OH2.3]
                                                                                                    (1)          [F81-OH1.1]                                        (2)         [F20,F81-OH2.1,OH2.2,OH2.3]



                                                                                                    National Plumbing Code of Canada 2020                                                                               Division B 2-63
                                                                                                    2.8.1.1.                                                                                                      Division B

                                                                                                                       Table 2.8.1.1. (Continued)                                    Table 2.8.1.1. (Continued)

                                                                                                     Provision          Functional Statements and Objectives (1)   Provision           Functional Statements and Objectives (1)
                                                                                                    2.3.3.1. Drilled and Tapped Joints                             (2)         [F81-OH2.2,OH2.4]
                                                                                                    (1)          [F81-OH1.1]                                       2.3.3.12. Copper Joints Used Underground
                                                                                                                 [F20,F81-OH2.2,OH2.3]                             (1)         [F20,F80-OP5]
                                                                                                    2.3.3.2. Extracted Tees                                        (2)         [F20,F80-OP5]
                                                                                                    (1)          [F81-OH2.1,OH2.3]                                 2.3.4.1. Capability of Support
                                                                                                                 [F20-OP5]                                         (1)         [F20-OH2.1,OH2.4]




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    2.3.3.3. Prohibition of Welding of Pipes and Fittings                      [F20-OS3.1]
                                                                                                    (1)          [F20-OH1.1]                                                   [F20-OP5]
                                                                                                                 [F20-OH2.1,OH2.2,OH2.3]                           (2)         [F20-OS3.1]
                                                                                                    (2)          [F80-OH2.2]                                                   [F20-OH2.1,OH2.3]
                                                                                                                 [F80-OP5]                                         2.3.4.2. Independence of Support
                                                                                                    2.3.3.4. Unions and Slip Joints                                (1)         [F20-OS3.1]
                                                                                                    (1)          [F81-OH1.1]                                                   [F20-OH2.1,OH2.3]
                                                                                                                 [F81-OH2.1,OH2.3]                                             [F20-OP5]
                                                                                                    (2)          [F81-OH1.1]                                       2.3.4.3. Insulation of Support
                                                                                                                 [F81-OH2.1,OH2.3]                                 (1)         [F80-OH2.1,OH2.3]
                                                                                                    2.3.3.5. Increaser or Reducer                                              [F80-OS3.1]
                                                                                                    (1)          [F81-OH1.1]                                                   [F80-OP5]
                                                                                                                 [F70,F80-OH2.2]                                   (2)         [F80-OH2.1,OH2.3]
                                                                                                    2.3.3.6. Dissimilar Materials                                              [F80-OS3.1]
                                                                                                    (1)          [F80-OH1.1]                                                   [F80-OP5]
                                                                                                                 [F80-OP5]                                         2.3.4.4. Support for Vertical Piping
                                                                                                                 [F80-OH2.1]                                       (1)         [F20-OH2.1]
                                                                                                    2.3.3.7. Connection of Roof Drain to Leader                                [F20-OS3.1]
                                                                                                    (1)          [F21,F81-OP5]                                     (2)         [F20-OH2.1]
                                                                                                    2.3.3.8. Connection of Floor or Wall Outlet Fixtures                       [F20-OS3.1]
                                                                                                    (1)          [F80-OH2.1,OH2.3]                                             [F20-OP5]
                                                                                                    (2)          [F80-OH2.1]                                       2.3.4.5. Support for Horizontal Piping
                                                                                                    (4)          [F20-OH2.1]                                       (1)         [F20-OS3.1]
                                                                                                                 [F20-OS3.1]                                                   [F20-OH2.1,OH2.3]
                                                                                                    (5)          [F20,F43-OH2.1]                                               [F20-OP5]
                                                                                                                 [F20,F30-OS3.1]                                   (2)         [F20-OS3.1]
                                                                                                    (6)          [F81-OH2.1]                                                   [F20-OH2.1]
                                                                                                    (7)          [F21-OH2.1]                                                   [F20-OP5]
                                                                                                    2.3.3.9. Expansion and Contraction                             (3)         [F20-OP5]
                                                                                                    (1)          [F21-OH1.1]                                                   [F20,F81-OS3.1]
                                                                                                                 [F21-OH2.1]                                                   [F20-OH2.1]
                                                                                                                 [F21-OP5]                                         (4)         [F81-OP5]
                                                                                                    2.3.3.10. Copper Tube                                                      [F81-OS3.1]
                                                                                                    (1)          [F20-OH1.1]                                       (5)         [F20,F21-OP5]
                                                                                                                 [F20-OP5]                                                     [F20-OS3.1]
                                                                                                    2.3.3.11. Indirect Connections                                             [F20-OH2.1]
                                                                                                    (1)          [F81-OH2.2,OH2.4]



                                                                                                    2-64 Division B                                                                        National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                              2.8.1.1.

                                                                                                                       Table 2.8.1.1. (Continued)                                         Table 2.8.1.1. (Continued)

                                                                                                     Provision           Functional Statements and Objectives (1)   Provision              Functional Statements and Objectives (1)
                                                                                                    (6)          [F20-OP5]                                          (2)         [F81-OH1.1]
                                                                                                                 [F20-OS3.1]                                                    [F81-OH2.1,OH2.3]
                                                                                                                 [F20-OH2.1]                                        2.3.6.5. Air Pressure Tests
                                                                                                    2.3.4.6. Support for Underground Horizontal Piping              (1)         [F81-OH1.1]
                                                                                                    (1)          [F20-OP5]                                                      [F81-OH2.1,OH2.3]
                                                                                                                 [F81-OH2.1]                                        2.3.6.6. Final Tests




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    2.3.4.7. Support for Vent Pipe above a Roof                     (1)         [F81-OH1.1]
                                                                                                    (1)          [F81-OS3.1]                                                    [F81-OH2.1,OH2.3]
                                                                                                                 [F81-OP5]                                          (2)         [F81-OH1.1]
                                                                                                    2.3.5.1. Protection of Piping                                               [F81-OH2.1,OH2.3]
                                                                                                    (1)          (a) [F81-OP5]                                      2.3.6.7. Ball Tests
                                                                                                                 [F81-OH2.1,OH2.3]                                  (1)         [F81-OH2.1,OH2.3]
                                                                                                    2.3.5.2. Isolation from Loads                                   (2)         [F81-OH2.1,OH2.3]
                                                                                                    (1)          [F81-OH2.1,OH2.3]                                  2.3.7.1. Application of Tests
                                                                                                                 [F81-OP5]                                          (1)         [F81-OP5]
                                                                                                    2.3.5.3. Protection Against Freezing                            (3)         [F81-OP5]
                                                                                                    (1)          [F81-OP5]                                          (4)         [F81-OP5]
                                                                                                                 [F81-OH2.1,OH2.3]                                  2.3.7.2. Pressure Tests of Potable Water Systems
                                                                                                    2.3.5.4. Protection from Mechanical Damage                      (1)         [F20-OP5]
                                                                                                    (1)          [F81-OH2.1,OH2.3]                                  (2)         [F20,F81-OS3.1]
                                                                                                                 [F81-OP5]                                          2.3.7.3. Water Pressure Tests
                                                                                                    2.3.5.5. Protection from Condensation                           (1)         [F81-OP5]
                                                                                                    (1)          [F81-OP5]                                          (2)         [F70-OH2.2]
                                                                                                    2.3.6.1. Tests and Inspection of Drainage or Venting Systems    2.4.2.1. Connections to Sanitary Drainage Systems
                                                                                                    (1)          [F81-OH2.1,OH2.3] Applies to drainage systems.     (1)         [F72-OH2.1] Applies to fixtures that are directly connected
                                                                                                                                                                                to sanitary drainage systems.
                                                                                                                 [F81-OH1.1] Applies to venting systems.
                                                                                                                                                                                (a) [F81-OH2.2]
                                                                                                    (2)          [F81-OH1.1] Applies to venting systems.
                                                                                                                                                                                (b) [F81-OH2.2]
                                                                                                                 [F81-OH2.1,OH2.3] Applies to drainage systems.
                                                                                                                                                                                (c) [F81-OH2.1]
                                                                                                    (3)          [F81-OH1.1]
                                                                                                                                                                                (d) [F81-OH2.1]
                                                                                                                 [F81-OH2.1,OH2.3]
                                                                                                                                                                                (e) [F81-OH2.1]
                                                                                                    (4)          [F81-OH1.1] Applies to venting systems.
                                                                                                                                                                    (2)         [F81-OH1.1]
                                                                                                                 [F81-OH2.1,OH2.3] Applies to drainage systems.
                                                                                                                                                                    (3)         [F81-OH1.1]
                                                                                                    (5)          [F81-OH2.1,OH2.3]
                                                                                                                                                                    (4)         [F81-OH1.1]
                                                                                                    2.3.6.2. Tests of Pipes in Drainage Systems
                                                                                                                                                                    (5)         [F81-OH1.1]
                                                                                                    (1)          [F81-OH2.1,OH2.3]
                                                                                                                                                                    2.4.2.2. Connection of Overflows from Rainwater Tanks
                                                                                                                 [F81-OP5]
                                                                                                                                                                    (1)         [F81-OH2.2]
                                                                                                    (2)          [F81-OH2.1]
                                                                                                                                                                    2.4.2.3. Direct Connections
                                                                                                    2.3.6.3. Tests of Venting Systems
                                                                                                                                                                    (1)         [F81-OH2.2]
                                                                                                    (1)          [F81-OH1.1]
                                                                                                                                                                    (2)         [F81-OH2.1,OH2.4]
                                                                                                    2.3.6.4. Water Pressure Tests
                                                                                                                                                                    (3)         [F81-OH2.4]
                                                                                                    (1)          [F81-OH1.1]
                                                                                                                                                                    2.4.3.1. Urinals
                                                                                                                 [F81-OH2.1,OH2.3]
                                                                                                                                                                    (1)         [F81-OH2.4]



                                                                                                    National Plumbing Code of Canada 2020                                                                                 Division B 2-65
                                                                                                    2.8.1.1.                                                                                                         Division B

                                                                                                                       Table 2.8.1.1. (Continued)                                       Table 2.8.1.1. (Continued)

                                                                                                     Provision            Functional Statements and Objectives (1)    Provision           Functional Statements and Objectives (1)
                                                                                                    2.4.3.2. Restricted Locations of Indirect Connections and Traps   2.4.6.1. Separate Systems
                                                                                                    (1)          [F81-OH2.1,OH2.4]                                    (1)         [F81-OH2.1]
                                                                                                    2.4.3.3. Equipment Restrictions Upstream of Grease Interceptors   (2)         [F81-OH2.1]
                                                                                                    (1)          [F81-OH2.1]                                          (3)         [F81-OH1.1]
                                                                                                    2.4.3.4. Fixtures Located in Chemical Storage Locations           2.4.6.2. Location of Sanitary Drainage Pipes
                                                                                                    (1)          [F81-OS1.1]                                          (1)         [F81-OH2.2]




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                 [F43-OH5]                                            2.4.6.3. Sumps or Tanks
                                                                                                    2.4.3.5. Macerating Toilet Systems                                (1)         [F81-OH2.1]
                                                                                                    (1)          [F72-OH2.1]                                          (2)         [F81-OH2.1] Applies to the watertightness of sumps or
                                                                                                                                                                                  tanks.
                                                                                                    2.4.3.6. Drains Serving Elevator Pits
                                                                                                                                                                                  [F40,F81-OH1.1]
                                                                                                    (1)          (a) [F62-OP5]
                                                                                                                                                                      (3)         [F40,F81-OH2.1]
                                                                                                                 (b) [F81-OH2.1]
                                                                                                                                                                                  [F40,F81-OH1.1]
                                                                                                    2.4.4.1. Sewage Treatment
                                                                                                                                                                      (4)         [F81-OH2.1]
                                                                                                    (1)          [F81-OH2.1]
                                                                                                                                                                      (5)         [F81-OH2.1]
                                                                                                    2.4.4.2. Cooling of Hot Water or Sewage
                                                                                                                                                                      (6)         [F81-OH2.1]
                                                                                                    (1)          [F81-OH2.1]
                                                                                                                                                                      (7)         [F81-OH2.1]
                                                                                                    2.4.4.3. Interceptors
                                                                                                                                                                      (8)         [F81-OH2.1]
                                                                                                    (1)          [F81-OH2.1]
                                                                                                                                                                      2.4.6.4. Protection from Backflow
                                                                                                    (2)          [F81-OS1.1]
                                                                                                                                                                      (1)         [F81-OH2.1]
                                                                                                                 [F43-OH5]
                                                                                                                                                                      (3)         [F81-OH2.1]
                                                                                                    (3)          [F81-OH2.1]
                                                                                                                                                                      (4)         [F81-OH2.1]
                                                                                                    (4)          [F81-OH2.1]
                                                                                                                                                                                  [F81-OH1.1]
                                                                                                    2.4.4.4. Neutralizing and Dilution Tanks
                                                                                                                                                                      (5)         [F81-OH1.1]
                                                                                                    (1)          [F80-OS3.4]
                                                                                                                                                                                  [F81-OH2.1]
                                                                                                    (2)          [F43-OH5]
                                                                                                                                                                      2.4.6.5. Mobile Home Sewer Service
                                                                                                                 [F80-OH2.1]
                                                                                                                                                                      (1)         [F81-OH2.1]
                                                                                                    2.4.5.1. Traps for Sanitary Drainage Systems
                                                                                                                                                                      2.4.7.1. Cleanouts for Drainage Systems
                                                                                                    (1)          [F81-OH1.1]
                                                                                                                                                                      (1)         [F81-OH2.1]
                                                                                                    (6)          [F81-OH1.1]
                                                                                                                                                                      (2)         [F81-OH2.1]
                                                                                                                 [F81-OP5]
                                                                                                                                                                      (3)         [F81-OH2.1]
                                                                                                    2.4.5.2. Traps for Storm Drainage Systems
                                                                                                                                                                      (4)         [F81-OH2.1]
                                                                                                    (1)          [F81-OH1.1]
                                                                                                                                                                      (5)         [F81-OH2.1]
                                                                                                    (2)          [F81-OH1.1]
                                                                                                                                                                      (6)         [F81-OH2.1]
                                                                                                    (3)          [F81-OP5]
                                                                                                                                                                      (7)         [F81-OH2.1]
                                                                                                    2.4.5.3. Connection of Subsoil Drainage Pipe to a Sanitary
                                                                                                    Drainage System                                                   (8)         [F81-OH2.1]
                                                                                                    (1)          [F81-OH2.1]                                          (9)         [F81-OH2.1]
                                                                                                                 [F81-OH1.1]                                          (10)        [F82-OH2.1]
                                                                                                    2.4.5.4. Location and Cleanout for Building Traps                             [F82-OP5]
                                                                                                    (1)          [F81-OH2.1]                                          (11)        [F81-OH2.1]
                                                                                                    2.4.5.5. Trap Seals                                                           [F81-OP5]
                                                                                                    (1)          [F81-OH1.1]                                          2.4.7.2. Size and Spacing of Cleanouts
                                                                                                                                                                      (1)         [F81-OH2.1]



                                                                                                    2-66 Division B                                                                           National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                           2.8.1.1.

                                                                                                                        Table 2.8.1.1. (Continued)                                    Table 2.8.1.1. (Continued)

                                                                                                     Provision           Functional Statements and Objectives (1)   Provision           Functional Statements and Objectives (1)
                                                                                                    (2)          [F81-OH2.1]                                        2.4.10.1. Total Load on a Pipe
                                                                                                    (3)          [F81-OH2.1]                                        (1)         [F81-OH2.1]
                                                                                                    (4)          [F81-OH2.1]                                        2.4.10.2. Hydraulic Loads for Fixtures
                                                                                                    (5)          [F81-OH2.1]                                        (2)         [F81-OH2.1]
                                                                                                    2.4.7.3. Manholes                                               2.4.10.3. Hydraulic Loads from Fixtures with a Continuous Flow
                                                                                                    (1)          [F20-OS3.1]                                        (1)         [F81-OH2.1]




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    (2)          (a),(c) [F81-OH1.1]                                (2)         [F81-OH2.1]
                                                                                                                 (a),(c) [F81-OS1.1]                                2.4.10.4. Hydraulic Loads from Roofs or Paved Surfaces
                                                                                                                 (b) [F20-OS3.1]                                    (1)         [F81-OP5]
                                                                                                    (3)          [F30-OS3.1]                                                    [F20,F81-OS2.1]
                                                                                                    (4)          [F81-OH2.1]                                        (2)         [F20,F81-OP5]
                                                                                                    2.4.7.4. Location of Cleanouts                                              (a),(d),(e) [F41,F81-OH2.4]
                                                                                                    (1)          [F81-OH2.1]                                                    (b),(c) [F20,F81-OS2.1]
                                                                                                    (2)          (a) [F81-OS3.1]                                    (3)         [F20,F81-OP5]
                                                                                                                 (b) [F81-OH2.1]                                                [F20,F81-OS2.1]
                                                                                                    (3)          [F81-OH2.1]                                        (4)         [F21,F81-OP5]
                                                                                                    (4)          [F81-OH2.1] Applies to drainage piping.                        [F20,F81-OS2.1]
                                                                                                                 [F81-OH1.1] Applies to vent piping.                2.4.10.5. Conversion of Fixture Units to Litres
                                                                                                    (5)          [F43-OH5]                                          (1)         [F81-OH2.1]
                                                                                                                 [F43-OS3.4]                                        2.4.10.6. Hydraulic Loads to Sanitary Drainage Pipes
                                                                                                    2.4.8.1. Minimum Slope                                          (1)         [F72-OH2.1,OH2.3]
                                                                                                    (1)          [F81-OH2.1]                                        (2)         [F72-OH2.1,OH2.3]
                                                                                                    2.4.8.2. Length of Fixture Outlet Pipes                         2.4.10.7. Hydraulic Loads on Branches
                                                                                                    (1)          [F81-OH1.1]                                        (1)         [F72-OH2.1,OH2.3]
                                                                                                    2.4.9.1. No Reduction in Size                                   2.4.10.8. Hydraulic Loads on Sanitary Building Drains or Sewers
                                                                                                    (1)          [F81-OH2.1]                                        (1)         [F81-OH2.1,OH2.3]
                                                                                                                 [F81-OH1.1]                                        2.4.10.9. Hydraulic Loads on Storm or Combined Building Drains
                                                                                                    2.4.9.2. Serving Water Closets                                  or Sewers

                                                                                                    (1)          [F81-OH2.1]                                        (1)         [F81-OH2.1,OH2.3]

                                                                                                    (2)          [F81-OH2.1]                                        2.4.10.10. Hydraulic Loads to Roof Gutters

                                                                                                    (3)          [F81-OH2.1]                                        (1)         [F81-OP5]

                                                                                                    (4)          [F81-OH2.1]                                        2.4.10.11. Hydraulic Loads on Leaders

                                                                                                    2.4.9.3. Size of Fixture Outlet Pipes                           (1)         [F81-OP5]

                                                                                                    (1)          [F81-OH2.1]                                        2.4.10.12. Hydraulic Loads from Fixtures with a Semi-continuous
                                                                                                                                                                    Flow
                                                                                                    (2)          [F81-OH2.1]
                                                                                                                                                                    (1)         [F81-OP5]
                                                                                                    (3)          [F81-OP5]
                                                                                                                                                                    2.4.10.13. Design of Storm Sewers
                                                                                                                 [F81-OH1.1]
                                                                                                                                                                    (1)         [F81-OH2.1]
                                                                                                    2.4.9.4. Size of Building Drain and Building Sewer
                                                                                                                                                                    2.5.1.1. Venting for Traps
                                                                                                    (1)          [F81-OH2.1]
                                                                                                                                                                    (1)         [F81-OH1.1]
                                                                                                    2.4.9.5. Offset in Leaders
                                                                                                                                                                    (2)         [F81-OH1.1]
                                                                                                    (1)          [F81-OH2.1,OH2.3]
                                                                                                                                                                    2.5.2.1. Wet Venting
                                                                                                    (2)          [F81-OH2.1]
                                                                                                                                                                    (1)         [F81-OH1.1]




                                                                                                    National Plumbing Code of Canada 2020                                                                              Division B 2-67
                                                                                                    2.8.1.1.                                                                                                          Division B

                                                                                                                       Table 2.8.1.1. (Continued)                                         Table 2.8.1.1. (Continued)

                                                                                                     Provision            Functional Statements and Objectives (1)   Provision             Functional Statements and Objectives (1)
                                                                                                    2.5.3.1. Circuit Venting                                         2.5.5.5. Provision for Future Installations
                                                                                                    (1)          [F40,F81-OH1.1]                                     (1)         [F81-OH1.1] Applies to venting systems.
                                                                                                    (2)          [F40,F81-OH1.1]                                                 [F81-OH2.1,OH2.3] Applies to drainage systems.
                                                                                                    (3)          [F40,F81-OH1.1]                                     (2)         [F40,F81-OH1.1]
                                                                                                    (4)          [F40,F81-OH1.1]                                     2.5.6.1. Drainage of Vent Pipes
                                                                                                    (5)          [F40,F81-OH1.1]                                     (1)         [F81-OH1.1]




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    (6)          [F40,F81-OH1.1]                                                 [F81-OS1.1]
                                                                                                    (7)          [F40,F81-OH1.1]                                     2.5.6.2. Vent Pipe Connections
                                                                                                    (8)          [F40,F81-OH1.1]                                     (1)         [F81-OH1.1]
                                                                                                    (9)          [F40,F81-OH1.1]                                     (2)         [F81-OH1.1]
                                                                                                    (10)         [F40,F81-OH1.1]                                     (3)         [F40,F81-OH1.1]
                                                                                                    (11)         [F40,F81-OH1.1]                                     2.5.6.3. Location of Vent Pipes
                                                                                                    2.5.4.1. Stack Vents                                             (1)         [F81-OH1.1]
                                                                                                    (1)          [F40,F81-OH1.1]                                     (2)         [F81-OH2.1,OH2.3]
                                                                                                    2.5.4.2. Vent Stacks                                             (3)         [F81-OH1.1]
                                                                                                    (1)          [F40,F81-OH1.1]                                     (4)         [F40,F81-OH1.1]
                                                                                                    (3)          [F40,F81-OH1.1]                                     2.5.6.4. Connection of Vents above Fixtures Served
                                                                                                    (4)          [F40,F81-OH1.1]                                     (1)         [F81-OH1.1]
                                                                                                    2.5.4.3. Yoke Vents                                              (2)         [F81-OH1.1]
                                                                                                    (1)          [F40,F81-OH1.1]                                     2.5.6.5. Terminals
                                                                                                    (2)          [F40,F81-OH1.1]                                     (1)         [F81-OH1.1]
                                                                                                    (3)          [F40,F81-OH1.1]                                     (2)         [F81-OH1.1]
                                                                                                    (4)          [F40,F81-OH1.1]                                     (3)         [F81-OH1.1]
                                                                                                    2.5.4.4. Offset Relief Vents                                     (4)         [F81-OH1.1]
                                                                                                    (1)          [F40,F81-OH1.1]                                     (5)         [F81-OH1.1]
                                                                                                    2.5.4.5. Fixtures Draining into Vent Pipes                       (6)         [F81-OH1.1]
                                                                                                    (1)          [F40,F81-OH1.1]                                     2.5.7.1. General
                                                                                                    2.5.5.1. Venting of Sewage Sumps                                 (1)         [F81-OH1.1]
                                                                                                    (1)          [F40,F81-OH1.1]                                     2.5.7.2. Size Restriction
                                                                                                    2.5.5.2. Venting of Oil Interceptors                             (1)         [F81-OH1.1]
                                                                                                    (1)          [F40,F81-OS1.1]                                     (2)         [F81-OH1.1]
                                                                                                                 [F72,F81-OH2.1,OH2.3]                               2.5.7.3. Additional Circuit Vents and Relief Vents
                                                                                                                 [F40,F81-OH1.1]                                     (1)         [F81-OH1.1]
                                                                                                    (2)          [F40,F81-OS1.1]                                     (2)         [F81-OH1.1]
                                                                                                                 [F40,F81-OH1.1]                                     2.5.7.4. Offset Relief Vents
                                                                                                    (3)          [F40,F81-OS1.1]                                     (1)         [F81-OH1.1]
                                                                                                    (4)          [F40,F81-OS1.1]                                     2.5.7.5. Yoke Vents
                                                                                                    (5)          [F40,F81-OS1.1]                                     (1)         [F81-OH1.1]
                                                                                                    2.5.5.3. Venting of Drain Piping and Tanks for Corrosive Waste   2.5.7.6. Vent Pipes for Manholes
                                                                                                    (1)          [F80,F81-OS3.4]                                     (1)         [F81-OH2.1]
                                                                                                    2.5.5.4. Fresh Air Inlets                                        2.5.7.7. Vents for Sewage Sumps, Neutralizing and Dilution
                                                                                                    (1)          [F81-OH1.1]                                         Tanks, and Macerating Toilet Systems
                                                                                                                                                                     (1)         [F81-OH2.1]



                                                                                                    2-68 Division B                                                                           National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                             2.8.1.1.

                                                                                                                        Table 2.8.1.1. (Continued)                                     Table 2.8.1.1. (Continued)

                                                                                                     Provision           Functional Statements and Objectives (1)   Provision           Functional Statements and Objectives (1)
                                                                                                    (2)          [F81-OH2.1]                                        (5)         [F130-OE1.2]
                                                                                                    (3)          [F81-OH1.1]                                        2.6.1.7. Relief Valves
                                                                                                    2.5.8.1. Hydraulic Loads Draining to Wet Vents                  (1)         [F31,F81-OS3.2]
                                                                                                    (1)          [F81-OH1.1]                                        (2)         [F81-OS3.1,OS3.2]
                                                                                                    2.5.8.2. Individual Vents and Dual Vents                        (4)         (a) [F31-OS3.2] [F81-OS1.1]
                                                                                                                                                                                (b) [F81-OS3.1,OS3.2]
                                                                                                    (1)          [F81-OH1.1]




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                    (5)         [F31-OS3.2]
                                                                                                    2.5.8.3. Branch Vents, Vent Headers, Continuous Vents and
                                                                                                    Circuit Vents                                                               (b) [F81-OH2.2] Applies to the size of air breaks.
                                                                                                    (1)          [F81-OH1.1]                                        (6)         [F31-OS3.2]
                                                                                                    2.5.8.4. Vent Stacks or Stack Vents                             (7)         [F31-OS3.2]
                                                                                                    (3)          [F81-OH1.1]                                        (8)         [F81-OS3.2]
                                                                                                    (4)          [F81-OH1.1]                                        (9)         [F81-OP5]
                                                                                                    2.5.9.2. Air Admittance Valves                                  (10)        [F81-OP5]
                                                                                                    (1)          [F40,F81-OH1.1]                                    2.6.1.8. Solar Domestic Hot Water Systems
                                                                                                    (2)          [F40,F81-OH1.1]                                    (1)         [F31-OS3.2] [F81-OS3.4]
                                                                                                    2.5.9.3. Installation Conditions                                            [F70-OH2.2]
                                                                                                    (1)          [F40,F81-OH1.1]                                    2.6.1.9. Water Hammer
                                                                                                    (2)          [F40,F81-OH1.1]                                    (1)         [F20,F81-OS3.2]
                                                                                                    (3)          [F40,F81-OH1.1]                                                [F20,F81-OP5]
                                                                                                    (4)          [F40,F81-OH1.1]                                    2.6.1.10. Mobile Home Water Service
                                                                                                    (5)          [F40,F81-OH1.1]                                    (1)         [F71,F70,F46-OH2.2,OH2.3]
                                                                                                    2.6.1.1. Design                                                 2.6.1.11. Thermal Expansion
                                                                                                    (1)          [F31-OS3.2]                                        (1)         [F20,F81,F46-OP5]
                                                                                                    (2)          [F71-OH2.3]                                        2.6.1.12. Service Water Heaters
                                                                                                    2.6.1.2. Drainage                                               (1)         [F40-OS3.4]
                                                                                                    (1)          [F81-OP5]                                          2.6.2.1. Connection of Systems
                                                                                                    2.6.1.3. Shut-off Valves                                        (1)         [F70,F81,F46-OH2.1,OH2.2,OH2.3]
                                                                                                    (1)          [F81-OP5]                                          (2)         [F70,F81,F46-OH2.1,OH2.2,OH2.3]
                                                                                                    (2)          [F81-OP5]                                          (3)         [F70,F81,F82-OH2.2,OH2.3]
                                                                                                    (3)          [F81-OP5]                                          2.6.2.2. Back-Siphonage
                                                                                                    (4)          [F81-OP5]                                          (1)         [F70,F81,F46-OH2.1,OH2.2,OH2.3]
                                                                                                    (5)          [F70,F72-OH2.1,OH2.3]                              (2)         [F70,F81,F46-OH2.1,OH2.2,OH2.3]
                                                                                                    (6)          [F70,F72-OH2.1,OH2.3]                              2.6.2.3. Backflow Caused by Back Pressure
                                                                                                    (7)          [F70,F81-OH2.1,OH2.3]                              (1)         [F70,F81,F46-OH2.1,OH2.2,OH2.3]
                                                                                                    2.6.1.4. Protection for Exterior Water Supply                   (2)         [F70,F81,F46-OH2.1,OH2.2,OH2.3]
                                                                                                    (1)          [F81-OP5]                                          (3)         [F70,F81,F46-OH2.1,OH2.2,OH2.3]
                                                                                                    2.6.1.5. Check Valves                                           2.6.2.4. Backflow from Fire Protection Systems
                                                                                                    (1)          [F20,F81-OP5]                                      (2)         [F46,F70,F81-OH2.1,OH2.2,OH2.3]
                                                                                                    2.6.1.6. Flushing Devices                                       (3)         [F46,F70,F81-OH2.1,OH2.2,OH2.3]
                                                                                                    (1)          [F72-OH2.1]                                        (4)         [F46,F70,F81-OH2.1,OH2.2,OH2.3]
                                                                                                    (2)          [F72-OH2.1]                                        2.6.2.5. Separation of Water Supply Systems
                                                                                                    (3)          [F130-OE1.2]                                       (1)         [F46,F70,F81-OH2.2]
                                                                                                    (4)          [F81-OH2.1]



                                                                                                    National Plumbing Code of Canada 2020                                                                                Division B 2-69
                                                                                                    2.8.1.1.                                                                                                           Division B

                                                                                                                        Table 2.8.1.1. (Continued)                                         Table 2.8.1.1. (Continued)

                                                                                                     Provision           Functional Statements and Objectives (1)     Provision             Functional Statements and Objectives (1)
                                                                                                    2.6.2.6. Premise Isolation                                       (2)            [F82-OH2.2]
                                                                                                    (1)          [F70,F81,F82-OH2.1,OH2.2,OH2.3]                     (3)            [F40-OH2.2]
                                                                                                    2.6.2.7. Hose Bibb                                               (4)            [F46-OH2.2]
                                                                                                    (1)          [F70,F81,F46-OH2.1,OH2.2,OH2.3]                     (5)            [F80,F81-OS3.4]
                                                                                                    2.6.2.8. Cleaning of Systems                                                    [F81-OP5]
                                                                                                    (1)          [F70,F81,F46-OH2.1,OH2.2,OH2.3]                     2.7.1.2. Identification and Marking




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    2.6.2.9. Air Gap                                                 (1)            [F46-OH2.2]
                                                                                                    (1)          [F70,F81,F46-OH2.1,OH2.2,OH2.3]                                    [F81-OH2.2]
                                                                                                    (2)          [F70,F81,F46-OH2.1,OH2.2,OH2.3]                     2.7.1.3. Location of Pipes
                                                                                                    2.6.2.10. Vacuum Breakers                                        (1)            [F46,F40-OH2.2]
                                                                                                    (2)          [F70,F81,F46-OH2.1,OH2.2,OH2.3]                                    [F40,F81-OH2.4]
                                                                                                    (3)          [F70,F81,F46-OH2.1,OH2.2,OH2.3]                     2.7.1.4. Location of Outlets
                                                                                                    (4)          [F70,F81,F46-OH2.1,OH2.2,OH2.3]                     (1)            [F40,F46-OH2.2]
                                                                                                    2.6.2.11. Tank-Type Water Closets                                2.7.2.2. Permitted Applications
                                                                                                    (1)          [F70,F81,F46-OH2.1,OH2.2,OH2.3]                     (1)            [F46-OH2.2]
                                                                                                    2.6.2.12. Backflow Preventers                                                   [F81-OH2.2]
                                                                                                    (1)          [F70,F81,F46-OH2.1,OH2.2,OH2.3]                     2.7.2.3. Roof Design
                                                                                                    2.6.3.1. Design, Fabrication and Installation                    (1)            [F41-OH2.2]
                                                                                                    (1)          [F71,F72-OH2.1,OH2.3]                               (2)            [F41-OH2.2]
                                                                                                    (2)          [F72-OH2.1] [F70-OH2.2] [F71-OH2.3]                 2.7.2.4. Non-Potable Rainwater Harvesting System Design
                                                                                                    (3)          [F81-OS1.4]                                         (1)            [F46,F80,F81-OH2.2]
                                                                                                                 [F70,F71-OH2.1,OH2.3]                               (2)            [F41-OH2.2]
                                                                                                                 [F81-OP5]                                           (3)            [F40-OH2.2]
                                                                                                    2.6.3.2. Hydraulic Load                                          (4)            [F41-OH2.2]
                                                                                                    (1)          [F71,F72-OH2.1,OH2.3]                               (5)            [F80,F81-OS3.4]
                                                                                                    (2)          [F71,F72-OH2.1,OH2.3]                                              [F81-OP5]
                                                                                                    (3)          [F71,F72-OH2.1,OH2.3]                               (6)            [F81-OH2.2]
                                                                                                    (4)          [F81-OH2.1,OH2.2]                                   (7)            [F81-OH2.2]
                                                                                                    2.6.3.3. Static Pressure                                                        [F81-OP5]
                                                                                                    (1)          [F80,F81-OS3.4]                                     (8)            [F81-OH2.2]
                                                                                                                 [F81-OP5]                                                          [F81-OP5]
                                                                                                    2.6.3.4. Size                                                    (9)            [F46-OH2.2]
                                                                                                    (1)          [F71,F72-OH2.1,OH2.3]                               (10)           [F46-OH2.2]
                                                                                                    (2)          [F71,F72-OH2.1,OH2.3]
                                                                                                                                                                    Notes to Table 2.8.1.1.:
                                                                                                    (3)          [F71,F72-OH2.1,OH2.3]                              (1)    See Parts 2 and 3 of Division A.
                                                                                                    (4)          [F81-OH2.3]
                                                                                                    (5)          [F71,F72-OH2.1,OH2.3]
                                                                                                    2.6.3.5. Velocity
                                                                                                    (1)          [F81-OH2.1,OH2.3]
                                                                                                                 [F81-OP5]
                                                                                                                 [F81-OS3.1]
                                                                                                    2.7.1.1. General
                                                                                                    (1)          [F81-OH2.2]



                                                                                                    2-70 Division B                                                                             National Plumbing Code of Canada 2020
                                                                                                    Division B



                                                                                                    Notes to Part 2
                                                                                                    Plumbing Systems




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    A-2.1.2.1.(2) Combined Building Drains. Combined building drains may have proven acceptable on
                                                                                                    the basis of past performance in some localities and their acceptance under this Code may be warranted.

                                                                                                    A-2.1.2.4.(1) Service Piping. The layout as shown in Figure A-2.1.2.4.(1)(c) may require special legal
                                                                                                    arrangements in some jurisdictions to ensure that access can be provided to all parts of the service pipes.

                                                                                                    These Notes are included for explanatory purposes only and do not form part of the requirements. The number
                                                                                                    that introduces each Note corresponds to the applicable requirement in this Part.
                                                                                                    The figures are schematic only; they depict various parts of the plumbing system but do not include details. For an
                                                                                                    explanation of the symbols and abbreviations used in the figures, refer to the list provided at the end of the Code.




                                                                                                    National Plumbing Code of Canada 2020                                                                                  Division B 2-71
                                                                                                    A-2.1.4.1.(1)                                                                                    Division B




                                                                                                                                                                                property line
                                                                                                                                                                                water service pipe
                                                                                                                                                                                building sewer




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                                 public sewer
                                                                                                                                            (a) Permitted                        public water main

                                                                                                                            Semi-detached                       Row housing



                                                                                                                                                                                 water service pipe
                                                                                                                                                                                 building sewer

                                                                                                                                                                                 public sewer
                                                                                                                                            (b) Permitted                        public water main

                                                                                                                            Semi-detached                       Row housing



                                                                                                                                                                                 water service pipe
                                                                                                                                                                                 building sewer

                                                                                                                                                                                 public sewer
                                                                                                                                            (c) Permitted                        public water main




                                                                                                                                                                                 property line

                                                                                                                                                                                 building sewer

                                                                                                                                                                                 water service pipe

                                                                                                                                                                                 public sewer
                                                                                                                                                                                 public water main
                                                                                                                                            (d) Not permitted
                                                                                                                                                                                                 EG01129A


                                                                                                     Figure A-2.1.2.4.(1)
                                                                                                     Service piping


                                                                                                    A-2.1.4.1.(1) Seismic Restraints and Design. Sentence 2.1.4.1.(1) aims to help ensure that plumbing
                                                                                                    systems will remain in place for a sufficient amount of time during an earthquake to allow for the safe
                                                                                                    evacuation of the building.



                                                                                                    2-72 Division B                                                           National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                 A-2.2.3.1.(1) and (3)

                                                                                                    A-2.2.2.3.(3)       Shower Drainage (Plan View).


                                                                                                                                      gutter
                                                                                                                                      floor drains             minimum
                                                                                                                                                               750 mm



                                                                                                                                      shower heads*                                             FD        floor sloped
                                                                                                                                                                                                          to drain




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                      floor sloped to gutter

                                                                                                                  * minimum distance between shower heads: 750 mm

                                                                                                                                     (a) Permitted                                     (b) Not permitted
                                                                                                                                                                                                                EG01130B


                                                                                                     Figure A-2.2.2.3.(3)
                                                                                                     Shower drainage (plan view)


                                                                                                    A-2.2.2.4.(1) Concealed Overflows. The use of concealed overflows does not preclude the use of
                                                                                                    a standing waste.

                                                                                                    A-2.2.3.1.(1) and (3)            Trap Seal Depth and Trap Connections.


                                                                                                                               This joint may be a slip joint but   inlet
                                                                                                                               not a gasket union.(1)
                                                                                                                                                                            Because these joints are
                                                                                                                                           outlet                           upstream of the trap weir,
                                                                                                                                                                            they may be slip joints or
                                                                                                                               trap weir                                    gasket unions.(1)
                                                                                                                               trap seal depth
                                                                                                                                                                            trap dip
                                                                                                                                                                            cleanout plug(2)

                                                                                                                                                                                                     EG01131B


                                                                                                     Figure A-2.2.3.1.(1) and (3)
                                                                                                     Trap seal depth and trap connections
                                                                                                     Notes to Figure A-2.2.3.1.(1) and (3):
                                                                                                     (1) See Article 2.3.3.4.
                                                                                                     (2) See Clause 2.2.3.1.(3)(a).




                                                                                                    National Plumbing Code of Canada 2020                                                                                  Division B 2-73
                                                                                                    A-2.2.3.1.(4)                                                                                          Division B

                                                                                                    A-2.2.3.1.(4) Prohibited Traps. Except for an S-trap standard, the S trap shown in Figure A-2.2.3.1.(4)(b)
                                                                                                    is prohibited by Clause 2.5.6.3.(1)(b), which limits the fall on fixture drains. Crown vented traps shown in
                                                                                                    Figure A-2.2.3.1.(4)(c) are prohibited by Clause 2.5.6.3.(1)(a), which requires that the distance from the trap
                                                                                                    weir to the vent be not less than twice the size of the fixture drain.


                                                                                                                                                                                  crown vent




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                            (a) Bell trap        (b) S trap             (c) Crown vented trap
                                                                                                                                                                                            EG01132A


                                                                                                     Figure A-2.2.3.1.(4)
                                                                                                     Prohibited traps


                                                                                                    A-2.2.3.2.(3) Grease Interceptors. CSA B481.4, “Maintenance of grease interceptors,” is considered to
                                                                                                    represent good practice regarding procedures for the maintenance of grease interceptors.

                                                                                                    A-2.2.4.1. T Fittings in Drainage Systems. The use of a cross fitting in a drainage system is
                                                                                                    prohibited, but such fitting may be used in a venting system to connect 4 vent pipes. In a drainage system, a T
                                                                                                    fitting can only be used as shown in Figure A-2.2.4.1.(a), and cannot be used as shown in Figure A-2.2.4.1.(b)
                                                                                                    because the T or cross fitting would change the direction of flow in the drainage system.



                                                                                                                        vent pipe                   vent pipe               vent pipe



                                                                                                                        horizontal                  sanitary                sanitary
                                                                                                                        sanitary drainage pipe      drainage pipe           drainage pipe

                                                                                                                        (a) Permitted               (b) Not permitted       (c) Not permitted
                                                                                                                                                                                                EG01133B


                                                                                                     Figure A-2.2.4.1.
                                                                                                     T fittings in drainage systems




                                                                                                    2-74 Division B                                                                National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                          A-2.2.5. to 2.2.8.

                                                                                                    A-2.2.4.2. Sanitary T Fittings in Drainage Systems. A sanitary T fitting may be used to change
                                                                                                    the direction of flow in a drainage system from horizontal to vertical, but may not be used to change the
                                                                                                    direction of flow in a nominally horizontal drainage system. A combination Y and 1/8th bend fitting may also
                                                                                                    be used as shown in Figure A-2.2.4.2.(b).




                                                                                                                                               This may be a vent pipe, a sanitary
                                                                                                                                               drainage pipe or a wet vent.
                                                                                                             vent pipe                                                               nominally horizontal




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                                     drainage pipe



                                                                                                             nominally horizontal
                                                                                                             sanitary drainage pipe

                                                                                                                                               nominally vertical                    nominally horizontal
                                                                                                                                               sanitary drainage pipe                drainage pipe

                                                                                                             (a) Permitted                     (b) Permitted                         (c) Not permitted (use
                                                                                                                                                                                         combination Y and
                                                                                                                                                                                         1/8 bend)
                                                                                                                                                                                                      EG01134A


                                                                                                     Figure A-2.2.4.2.
                                                                                                     Sanitary T fittings in drainage systems


                                                                                                    A-2.2.5. to 2.2.8.       Pipe and Fitting Applications.




                                                                                                    National Plumbing Code of Canada 2020                                                               Division B 2-75
                                                                                    Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays



                                                                                                                       Table A-2.2.5. to 2.2.8.
                                                                                                               Summary of Pipe and Fitting Applications

                                                                                                                                                               Use of Piping and Fittings (1)(2)
                                                                                                                                 Drainage System                Venting System                          Potable Water System
2-76 Division B

                                        NPC References     Types of Piping and Fittings       Standard References     Above-         Under-                                                    Aboveground                Underground
                                                                                                                      ground         ground        Building   Above-       Under-
                                                                                                                       inside         under         sewer     ground       ground                                      Under     Outside
                                                                                                                                                                                            Cold          Hot
                                                                                                                      building       building                                                                         building   building
                                        2.2.5.1.(1)      Fibrocement DWV pipe
                                                                                                                                                                                                                                            A-2.2.5. to 2.2.8.

                                                             Type 1, Class 3000                                          P              P             P         P             P               N             N            N          N
                                                             Type 2, Class 4000                CAN/CSA-B127.3

                                        2.2.5.2.         Concrete sewer pipe
                                                             Sewer, storm drain and              CSA A257.1              N             P (3)          P         N             N               N             N            N          N
                                                             culvert
                                                             Reinforced culvert, storm           CSA A257.2              N             P (3)          P         N             N               N             N            N          N
                                                             drain and sewer
                                        2.2.5.3.         Vitrified clay pipe                     CSA A60.1-M             N              P             P         N             P               N             N            N          N
                                        2.2.5.4.         PE water pipe and tubing
                                                             Series 160 sizes with                                       N              N             N         N             N               N             N           P (4)      P (4)
                                                             compression fittings                CSA B137.1
                                                             Series 50, 75, 100 and 125                                  N              N             N         N             N               N             N            N          N
                                        2.2.5.5.(1)      PE plastic pipe (DR-PR) based            ASTM F714              N              P             P         N             P               N             N            N          N
                                                            on outside diameter
                                        2.2.5.6.         PEX pressure tubing                     CSA B137.5              N              N             N         N             N            P (5)(6)      P (5)(6)        P          P
                                        2.2.5.7.(1)      PVC water pipe
                                                             Dimension ratios (DR) or
                                                             standard dimension ratios
                                                             (SDR) 14, 17, 18, 21, 25 and
                                                             26
                                                             Schedule 40 in sizes                CSA B137.3              N              N             N         N             N            P (5)(6)         N           P (7)      P (7)
                                                             from NPS ½ to NPS 2½
                                                             inclusively
                                                             Schedule 80 in sizes from
                                                             NPS ½ to NPS 6 inclusively
                                        2.2.5.7.(2)      PVC fittings
                                                             Schedule 40                         ASTM D2466              N              N             N         N             N            P (5)(6)         N            N          N
                                                             Schedule 80                         ASTM D2467              N              N             N         N             N            P (5)(6)         N            P          P
                                        2.2.5.7.(3)      PVC pressure fittings                   CSA B137.2              N              N             N         N             N            P (5)(6)         N            P          P
                                        2.2.5.8.         CPVC water pipe                         CSA B137.6              N              N             N         N             N           P (5)(6)(8)   P (5)(6)(8)     P (8)      P (8)
National Plumbing Code of Canada 2020
                                                                                                                                                                                                                                            Division B
                                                                                      Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




                                                                                                                      Table A-2.2.5. to 2.2.8. (Continued)

                                                                                                                                                                       Use of Piping and Fittings (1)(2)
                                                                                                                                        Drainage System                 Venting System                        Potable Water System
                                        NPC References     Types of Piping and Fittings         Standard References       Above-            Under-                                                     Aboveground             Underground
                                                                                                                          ground            ground        Building   Above-        Under-
                                                                                                                                                                                                                                                 Division B

                                                                                                                           inside            under         sewer     ground        ground                                  Under      Outside
                                                                                                                                                                                                   Cold         Hot
                                                                                                                          building          building                                                                      building    building
                                        2.2.5.9.         ABS Schedule 40 DWV pipe with              ASTM F628              P (5)(6)            P             P        P (5)(6)        P              N           N           N           N
                                                            a cellular core
                                                         Plastic sewer pipe PS ≥ 320 kPa           CSA B182.1                 N                P             P           N            N              N           N           N           N
                                                         PVC sewer pipe (PSM type)                 CSA B182.2                 N                P             P           N            P              N           N           N           N
                                                            ≤ 35-SDR
National Plumbing Code of Canada 2020




                                                         Profile PVC sewer pipe                    CSA B182.4                 N                P             P           N            P              N           N           N           N
                                                             PS ≥ 320 kPa
                                                         Profile PE sewer pipe                     CSA B182.6                 N                P             P           N            P              N           N           N           N
                                                             PS ≥ 320 kPa
                                        2.2.5.9. and     ABS DWV pipe                              CSA B181.1              P (5)(6)            P             P        P (5)(6)        P              N           N           N           N
                                        2.2.5.10.
                                                         PVC DWV pipe                              CSA B181.2              P (5)(6)            P             P        P (5)(6)        P              N           N           N           N
                                        2.2.5.12.        PE/AL/PE pressure pipe                    CSA B137.9                 N                N             N           N            N            P (5)(6)      N           P           P
                                        2.2.5.13.        PEX/AL/PEX pressure pipe                  CSA B137.10                N                N             N           N            N            P (5)(6)    P (5)(6)      P           P
                                        2.2.5.14.        PP-R pressure pipe                        CSA B137.11                N                N             N           N            N            P (5)(6)    P (5)(6)      P           P
                                        2.2.5.15.        PE-RT tube                                CSA B137.18                N                N             N           N            N            P (5)(6)    P (5)(6)      P           P
                                        2.2.5.16.        Cellular core PVC pipe                    ASTM F3128             P (5)(6)(9)         P (9)          N       P (5)(6)(9)     P (9)           N           N           N           N
                                        2.2.6.1.         Cast-iron soil pipe                         CSA B70                  P                P             P           P            P              N           N           N           N
                                        2.2.6.4.         Ductile-iron water pipe             ANSI/AWWA C151/A21.51            P                P             P           P            P              P           P           P           P
                                        2.2.6.5.         Screwed cast-iron fittings                ASME B16.4                 N                N             N           N            N              P           P           P           P
                                        2.2.6.6.         Screwed malleable-iron fittings           ASME B16.3                 N                N             N           N            N              P           P           P           P
                                        2.2.6.7.         Welded and seamless steel               ASTM A53/A53M                P                N             N           P            N            P (10)       P (10)      P (10)      P (10)
                                                            galvanized pipe
                                        2.2.6.8.         Corrugated steel galvanized pipe         CAN/CSA-G401                N                N           P (11)        N            N              N           N           N           N
                                        2.2.6.9.         Sheet metal pipe (12)                         —                      N                N             N           N            N              N           N           N           N
                                        2.2.6.10.        Stainless steel pipe                   ASTM A312/A312M               P                P             P           P            P              P           P           P           P
                                        2.2.6.14.        Stainless steel tube                   ASTM A269/A269M               N                N             N           N            N              P           P           P           P
                                        2.2.7.1.         Copper and brass pipe
                                                             Copper                                 ASTM B42                  P                P             P           P            P              P           P           P           P
Division B 2-77                                              Red brass                              ASTM B43                  P                P             P           P            P              P           P           P           P
                                                                                                                                                                                                                                                 A-2.2.5. to 2.2.8.
                                                                                           Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays



                                                                                                                            Table A-2.2.5. to 2.2.8. (Continued)

                                                                                                                                                                            Use of Piping and Fittings (1)(2)
2-78 Division B                                                                                                                              Drainage System                  Venting System                       Potable Water System
                                         NPC References        Types of Piping and Fittings          Standard References         Above-          Under-                                                     Aboveground            Underground
                                                                                                                                 ground          ground        Building    Above-        Under-
                                                                                                                                  inside          under         sewer      ground        ground                                 Under     Outside
                                                                                                                                                                                                        Cold         Hot
                                                                                                                                 building        building                                                                      building   building
                                         2.2.7.3.            Brass or bronze threaded water             ASME B16.15                 N               N             N           N            N                P         P           P          P
                                                                 fittings
                                                                                                                                                                                                                                                     A-2.2.5. to 2.2.8.


                                         2.2.7.4.            Copper tube
                                                                 Types K and L hard temper                                          P               P             P           P            P                P         P           N          N
                                                                 Types K and L soft temper                                          N               N             N           N            N                P         P           P          P
                                                                                                         ASTM B88
                                                                 Type M hard temper                                                 P               N             N           P            N                P         P           N          N
                                                                 Type M soft temper                                                 N               N             N           N            N                N         N           N          N
                                                                 Type DWV                               ASTM B306                 P (13)            N             N         P (13)         N                N         N           N          N
                                         2.2.7.5.            Solder-joint drainage fittings          ASME B16.23 and                P               P             P           P            P                N         N           N          N
                                                                                                       ASME B16.29
                                         2.2.7.6.            Solder-joint water fittings             ASME B16.18 and                N               N             N           P            P                P         P           P          P
                                                                                                       ASME B16.22
                                         2.2.7.8.            Lead sanitary drainage pipe                   —                        P               P             N           P            P                N         N           N          N
                                         2.2.8.1.            Polyolefin laboratory drainage             CSA B181.3                P (5)(6)          P             P         P (5)(6)       P                N         N           N          N
                                                                 systems

                                        Notes to Table A-2.2.5. to 2.2.8.:
                                        (1)  N = not permitted and P = permitted.
                                        (2)  Where firestops are pierced by pipes, the integrity of the firestop must be maintained.
                                        (3) Gasketted joints required.
                                        (4) Permitted only for water service pipe.
                                        (5) Combustible piping in noncombustible construction is subject to the requirements of Sentence 3.1.5.19.(1) of Division B of the NBC.
                                        (6) Combustible piping that penetrates a fire separation is subject to the requirements in Articles 3.1.9.4. and 9.10.9.7. to 9.10.9.9. of Division B of the NBC.
                                        (7) Not permitted in hot water systems.
                                        (8) Not to exceed design temperature and design pressure stated in Sentence 2.2.5.8.(2).
                                        (9) Permitted only in residential buildings containing 1 or 2 dwelling units and row houses that do not exceed 3 storeys in height.
                                        (10) Permitted only in buildings of industrial occupancy as described in the NBC, or for the repair of existing galvanized steel piping systems.
                                        (11) Permitted underground only in a storm drainage system.
                                        (12) Permitted only for an external leader.
                                        (13) Not permitted for the fixture drain or vent below the flood level rim of a flush-valve-operated urinal.
National Plumbing Code of Canada 2020
                                                                                                                                                                                                                                                     Division B
                                                                                                    Division B                                                                               A-2.2.10.6.(3)

                                                                                                    A-2.2.5.2.(3) Concrete Fittings. Concrete fittings fabricated on site from lengths of pipe may have
                                                                                                    proven acceptable on the basis of past performance in some localities and their acceptance under this Code
                                                                                                    may be warranted.

                                                                                                    A-2.2.5.5.(1) Polyethylene Pipe Used Underground. Joints within the high-density polyethylene
                                                                                                    pipe (HDPE) shall be heat-fused according to the manufacturer's instructions. Joints between HDPE pipes and
                                                                                                    other materials shall be made with a suitable hubless coupling.

                                                                                                    A-2.2.5.6.(1) Crosslinked Polyethylene Pipe and Fittings. There are some special installation
                                                                                                    requirements for the use of crosslinked polyethylene pipe and its associated fittings. Reference should,
                                                                                                    therefore, be made to the installation information in CSA B137.5, “Crosslinked polyethylene (PEX) tubing




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    systems for pressure applications.”

                                                                                                    A-2.2.5.9. to 2.2.5.11. Solvent Cement. CSA B137.6, “Chlorinated polyvinylchloride (CPVC) pipe,
                                                                                                    tubing, and fittings for hot- and cold-water distribution systems,” CSA B181.1, “Acrylonitrile-butadiene-styrene
                                                                                                    (ABS) drain, waste, and vent pipe and pipe fittings,” and CSA B181.2, “Polyvinylchloride (PVC) and chlorinated
                                                                                                    polyvinylchloride (CPVC) drain, waste, and vent pipe and pipe fittings,” reference ASTM D3138, “Standard
                                                                                                    Specification for Solvent Cements for Transition Joints Between Acrylonitrile-Butadiene-Styrene (ABS) and
                                                                                                    Poly(Vinyl Chloride) (PVC) Non-Pressure Piping Components,” which specifies the colour of the solvent
                                                                                                    cement. PVC cement shall be grey, ABS cement shall be yellow, CPVC cement shall be clear and transition
                                                                                                    cement shall be white. The standard colour allows Code users to readily determine if the correct solvent cement
                                                                                                    has been used. It should be noted that a transition cement is not an all-purpose cement.

                                                                                                    A-2.2.5.12.(1) Polyethylene/Aluminum/Polyethylene Composite Pipe and Fittings. There
                                                                                                    are some special installation requirements for the use of polyethylene/aluminum/polyethylene composite
                                                                                                    pipe and fittings. Reference should, therefore, be made to the installation information in CSA B137.9,
                                                                                                    “Polyethylene/aluminum/polyethylene (PE-AL-PE) composite pressure-pipe systems.”

                                                                                                    A-2.2.5.13.(1) Crosslinked Polyethylene/Aluminum/Crosslinked Polyethylene Composite
                                                                                                    Pressure Pipe and Fittings. There are some special installation requirements for the use of crosslinked
                                                                                                    polyethylene/aluminum/crosslinked polyethylene composite pipe and fittings. Reference should, therefore,
                                                                                                    be made to the installation information in CSA B137.10, “Crosslinked polyethylene/aluminum/crosslinked
                                                                                                    polyethylene (PEX-AL-PEX) composite pressure-pipe systems.”

                                                                                                    A-2.2.5.14.(1) Polypropylene Pipe and Fittings. There are some special installation requirements for
                                                                                                    the use of polypropylene pipe and fittings. Reference should, therefore, be made to the installation information
                                                                                                    in CSA B137.11, “Polypropylene (PP-R) pipe and fittings for pressure applications.”

                                                                                                    A-2.2.5.15.(1) Polyethylene of Raised Temperature Tube. It should be noted that CSA B137.18,
                                                                                                    “Polyethylene of raised temperature resistance (PE-RT) tubing systems for pressure applications,” contains
                                                                                                    special installation requirements, which should be followed.

                                                                                                    A-2.2.6.7.(3) Galvanized Steel Pipe. The use of galvanized steel pipe and fittings in a water
                                                                                                    distribution system may have proven acceptable on the basis of past performance in some localities and
                                                                                                    its acceptance under this Code may be warranted.

                                                                                                    A-2.2.10.5.(1) Saddle Hubs or Fittings. Saddle hubs or fittings may have proven acceptable on the
                                                                                                    basis of past performance in some localities and their acceptance under this Code may be warranted.

                                                                                                    A-2.2.10.6.(2) Supply Fittings and Individual Shower Heads. Flow restriction devices within
                                                                                                    supply fittings should not be removed.
                                                                                                    Due to the low flow rate of public lavatory faucets, design consideration should be given to the wait time for
                                                                                                    hot water to be delivered to each fixture.

                                                                                                    A-2.2.10.6.(3) Automatic Compensating Valves. When replacing a shower head, the appropriate
                                                                                                    shower valve with a suitable compensating feature matching the flow rate should be chosen to decrease
                                                                                                    the possibility that users will suffer thermal shock. The water flow rate of automatic compensating mixing
                                                                                                    valves can be found in ASSE 1016/ASME A112.1016/CSA B125.16, “Performance Requirements for Automatic
                                                                                                    Compensating Valves for Individual Showers and Tub/Shower Combinations.”


                                                                                                    National Plumbing Code of Canada 2020                                                             Division B 2-79
                                                                                                    A-2.2.10.6.(4) and (5)                                                                             Division B

                                                                                                    A-2.2.10.6.(4) and (5) Automatic Shut-off of Water Flow. Examples of water shut-off devices
                                                                                                    include occupant sensors and self-closing valves.

                                                                                                    A-2.2.10.6.(7) Manually Operated Valves. Manually operated valves are also known in the industry
                                                                                                    as supply line stops.

                                                                                                    A-2.2.10.7. Hot Water Temperature. Hot water delivered at 60°C, a typical thermostat setting for
                                                                                                    storage-type service water heaters, will severely burn human skin in 1 to 5 s. Consequently, Article 2.2.10.7.
                                                                                                    sets an upper limit on the temperature of water discharging from shower heads and into bathtubs. The
                                                                                                    water temperature is maintained at or below this limit through the installation and adjustment of automatic
                                                                                                    compensating valves or temperature-limiting devices. Compliance with the Article reduces the risk of scalding




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    in showers and bathtubs, which could result in severe burns, and the risk of thermal shock in showers, which
                                                                                                    could lead to falls. Children, older adults and people with disabilities are particularly at risk of scalding because
                                                                                                    they are not always able to remove themselves quickly from a shower or bathtub if the water becomes too hot.
                                                                                                    At a water temperature of 49°C, the time for a scald burn to occur on an adult is nearly 10 min, whereas the
                                                                                                    time for a scald burn to occur on an older adult is only 2 min because their skin is thinner and less vascularized.
                                                                                                    At a water temperature of 43°C, scald burns occur only after several hours of exposure. Therefore, setting 43°C
                                                                                                    as the maximum temperature for water discharging from shower heads and into bathtubs provides suitable
                                                                                                    protection from scald burns in healthcare facilities and seniors' residences.
                                                                                                    Although the temperature of water discharging into other fixtures, such as lavatories, sinks, laundry trays and
                                                                                                    bidets, is not addressed by Article 2.2.10.7., a risk of scalding may nonetheless exist at such fixtures.
                                                                                                    It should be noted that pressure-balanced valves are sensitive to seasonal changes in the temperature of the
                                                                                                    cold water supply and may require adjustments throughout the year to avoid exceeding the maximum water
                                                                                                    temperature prescribed in Article 2.2.10.7.

                                                                                                    A-2.2.10.9.(3) Bubblers. Bubblers installed on other than drinking fountains may have proven acceptable
                                                                                                    on the basis of past performance in some localities and their acceptance under this Code may be warranted.

                                                                                                    A-2.2.10.16.(1) Air Admittance Valve. An air admittance valve is a device that is closed by gravity
                                                                                                    and seals the vent terminal at zero differential pressure (no flow conditions) and under positive internal
                                                                                                    pressures. The valve allows air to enter the drainage system without the use of a vent extended to outside air
                                                                                                    and prevents trap siphonage.
                                                                                                    The material of the diaphragm can be damaged by exposure to acidic or corrosive fumes in the ambient
                                                                                                    atmosphere; therefore, air admittance valves should not be installed in locations where there is a potential for
                                                                                                    exposure to such fumes.

                                                                                                    A-2.3.2.6.(1) Mechanical Joints. Storm sewer blockage can cause mechanical joints at the base of
                                                                                                    leaders to fail, which results in flooding. The failure occurs because the cleanout joints at the base of the
                                                                                                    rainwater leaders are not able to withstand the water column pressure. To avoid such failures, it is necessary
                                                                                                    to ensure that storm water systems installed using mechanical joints be braced and/or restrained at the
                                                                                                    ends of branches, changes in direction and elevation, at dead ends and at other locations as required by the
                                                                                                    manufacturer to prevent the separation of joints due to internal pressure, mechanical stress or seismic events.
                                                                                                    Care should be taken to replace cleanouts properly after maintenance or testing.




                                                                                                    2-80 Division B                                                                  National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                                                         A-2.3.3.11.(2)

                                                                                                    A-2.3.3.9.        Linear Expansion.


                                                                                                                                                                     180

                                                                                                                                                                               1. PE (1404)
                                                                                                                                                                     160                                                                   1
                                                                                                                                                                               2. PEX, PE-RT & PP-R
                                                                                                                                                                               3. PE (2305-3306)                                   2
                                                                                                                                                                               4. ABS                                          3
                                                                                                                                                                     140




                                                                                                                              Linear expansion of 10 m of pipe, mm
                                                                                                                                                                               5. CPVC
                                                                                                                                                                               6. PVC (DWV)




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                     120       7. PVC (rigid)
                                                                                                                                                                               8. PE/AL/PE & PEX/AL/PEX
                                                                                                                                                                               9. copper
                                                                                                                                                                     100       10. stainless steel
                                                                                                                                                                               11. concrete
                                                                                                                                                                               12. mild steel and cast iron                   4
                                                                                                                                                                     80
                                                                                                                                                                               13. brick
                                                                                                                                                                                                                                   5
                                                                                                                                                                     60                                                   6
                                                                                                                                                                                                                  7
                                                                                                                                                                     40
                                                                                                                                                                                                                                                 8
                                                                                                                                                                                                                                       9
                                                                                                                                                                                                                          11 10
                                                                                                                                                                     20

                                                                                                                                                                                                                                           13     12
                                                                                                                                                                      0
                                                                                                                                                                           0        20          40             60             80                100
                                                                                                                                                                                             Temperature change, °C
                                                                                                                                                                                                                                                 EG00661D


                                                                                                      Figure A-2.3.3.9.
                                                                                                      Linear expansion


                                                                                                    Example 1

                                                                                                    To determine the expansion of 20 m of ABS pipe for a temperature change from 10°C to 60°C.
                                                                                                           Temperature change = 60 – 10 = 50°C,
                                                                                                           Enter the chart at 50°C, read up to ABS line, and then across to the mm scale = 47 mm/10 m of pipe,
                                                                                                           ∴ change in length of 20 m of pipe =


                                                                                                    A-2.3.3.9.(1) Expansion and Contraction. Expansion and contraction in piping systems may be
                                                                                                    accommodated in a number of ways including, but not limited to, piping design and layout, material selection,
                                                                                                    and the inclusion of expansion joints.

                                                                                                    A-2.3.3.11.(2)          Air Break.



                                                                                                                                                                                              indirectly connected pipe

                                                                                                                                                                                              air break
                                                                                                                                                                                              Not smaller than the NPS of the
                                                                                                                                                                                              indirectly connected pipe, or 25 mm
                                                                                                                                                                                              directly connected receptacle (fixture)
                                                                                                                                                                                                                               EG01136A



                                                                                                      Figure A-2.3.3.11.(2)
                                                                                                      Air break


                                                                                                    National Plumbing Code of Canada 2020                                                                                                                   Division B 2-81
                                                                                                    A-2.3.4.6.(1)                                                                                                          Division B

                                                                                                    A-2.3.4.6.(1) Support for Underground Piping. See explanation for Subsection 2.3.5. for additional
                                                                                                    protection required for underground pipes. Permitted installations are shown in Figure A-2.3.4.6.(1)(a). The
                                                                                                    methods of support shown in Figure A-2.3.4.6.(1)(b) are not permitted because the base does not provide
                                                                                                    firm and continuous support for the pipe.


                                                                                                                                                sand, crushed rock
                                                                                                                                                or frm earth
                                                                                                                                                rock
                                                                                                                                                                                        unstable fll
                                                                                                                                                                                        piers




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                layer of concrete
                                                                                                                                                                                            planking
                                                                                                                                                frm earth
                                                                                                                                                bell hole


                                                                                                                                                concrete
                                                                                                                                                encasement                                  boulder


                                                                                                                            (a) Permitted                                                       (b) Not permitted              EG01137B


                                                                                                     Figure A-2.3.4.6.(1)
                                                                                                     Support for underground piping


                                                                                                    A-2.3.5.1.(1)(a) Backfilling of Pipe Trench. Stronger pipes may be required in deep fill or under
                                                                                                    driveways, parking lots, etc., and compaction for the full depth of the trench may be necessary.




                                                                                                                                                                     300 mm
                                                                                                                                                                              backfill(1)




                                                                                                                                                   This part of the trench should be as narrow
                                                                                                                                                   as proper jointing and backfill will permit.
                                                                                                                                                                                              EG01138B


                                                                                                     Figure A-2.3.5.1.(1)(a)
                                                                                                     Backfilling of pipe trench
                                                                                                     Note to Figure A-2.3.5.1.(1)(a):
                                                                                                     (1) Backfill complying with Clause 2.3.5.1.(1)(a).


                                                                                                    A-2.3.5.3. Protection of Piping Against Freezing. The TIAC 2013, “Mechanical Insulation Best
                                                                                                    Practices Guide” is a comprehensive source of information on the selection, installation and proper use of
                                                                                                    thermal insulation materials. (Note that Section 4 of this Guide is not included in the scope of this Note as it
                                                                                                    contains information on proprietary products, which are not within the mandate of the Code.)

                                                                                                    A-2.3.6.5.(1) Air Pressure Tests. The addition of a non-toxic indicating substance, such as an aerosol,
                                                                                                    fluorescent dye, smoke or an odorant, to an air pressure test may help in identifying the location of a leak.
                                                                                                    However, the additive must be compatible with the piping material being tested: the intent is to identify the
                                                                                                    leak without affecting the outcome of the test or the integrity of the plumbing system.


                                                                                                    2-82 Division B                                                                                      National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                       A-2.4.2.1.(1)(a)(ii) and (e)(vi)

                                                                                                    A-2.3.7.2.(2) Pressure-Testing of Potable Water Systems. The plastic piping manufacturer
                                                                                                    should be consulted to determine the appropriateness of using air to pressure-test the piping system.

                                                                                                    A-2.4.2.1.(1)(a)(ii) and (e)(vi) Indirect Connections. See Sentence 2.4.5.1.(4) for trapping
                                                                                                    requirements for indirectly connected fixtures.
                                                                                                    See Sentence 2.4.7.1.(9) for cleanouts on drip pipes for food receptacles or display cases.



                                                                                                                                                                                                                         RD




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                      extended to outside air when           leader
                                                                                                                                       food display                   fixtures on 3 or more storeys
                                                                                                                                                                      are connected                 DF

                                                                                                                                                                      air break
                                                                                                                                       CO

                                                                                                                                                                      discharge
                                                                                                                                                                      from relief valve                 DF
                                                                                                                                glass filler                          max. height
                                                                                                                                                   frig.              300 mm
                                                                                                                                ice cream scoops
                                                                                                                                                   food          FD   clear-water
                                                                                                                                                                      waste
                                                                                                                     sink       coffee drips       compartment                                          DF
                                                                                                                                                                      stack


                                                                                                                                    CO
                                                                                                                                                                      air break
                                                                                                                    grease interceptor
                                                                                                                    air break
                                                                                                                    sanitary building drain
                                                                                                                                                                 CO   storm building drain



                                                                                                                                                                      installation of backwater valve
                                                                                                                                                                      recommended
                                                                                                                                                                      trap for leader (serves receptacles
                                                                                                                                                                      draining indirect connections)                  EG01140B


                                                                                                     Figure A-2.4.2.1.(1)(a)(ii) and (e)(vi)
                                                                                                     Indirect connections




                                                                                                    National Plumbing Code of Canada 2020                                                                                        Division B 2-83
                                                                                                    A-2.4.2.1.(2)                                                                                                                 Division B

                                                                                                    A-2.4.2.1.(2)        Sanitary Drainage Pipe Connections.


                                                                                                                                          stack
                                                                                                                                          no sanitary drainage pipe
                                                                                                                                          to connect in this area               stack
                                                                                                                                          1.5 m                                 no sanitary drainage pipe
                                                                                                                                                                                to connect in this area
                                                                                                                                  horizontal offset
                                                                                                                                                                                                    1.5 m
                                                                                                                                  stack




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                                branch or building drain

                                                                                                                                  (a) Connection to nominally                   (b) Connection to nominally
                                                                                                                                      horizontal offset                             horizontal sanitary drainage pipe
                                                                                                                                                                                                                    EG01141A


                                                                                                     Figure A-2.4.2.1.(2)
                                                                                                     Sanitary drainage pipe connections


                                                                                                    A-2.4.2.1.(4) and (5) Suds Pressure Zones. High sudsing detergents used in clothes washers
                                                                                                    produce suds that tend to disrupt the venting action of venting systems and can also spread through the lower
                                                                                                    portions of multi-storey drainage systems. The more turbulence, the greater the suds. One solution that avoids
                                                                                                    the creation of suds pressure zones involves connecting the suds-producing stack downstream of all other
                                                                                                    stacks and increasing the size of the horizontal building drain to achieve a greater flow of air and water. Using
                                                                                                    streamlined fittings, such as wyes, tends to reduce suds formation. Check valves or backwater valves in fixture
                                                                                                    outlet pipes have also been used to correct problem installations.


                                                                                                                                                        clothes       clothes                         detergent suds zone
                                                                                                                                                        washer        washer




                                                                                                                                      nominally horizontal                              40 x stack NPS or 2.44 m
                                                                                                                                      offset                                            (whichever is less)



                                                                                                                                                                                        10 x stack NPS
                                                                                                                                      40 x stack NPS


                                                                                                                            (1)



                                                                                                                                                                                        40 x branch or sanitary
                                                                                                                                      40 x stack NPS or 2.44 m                          building drain NPS
                                                                                                                                      (whichever is less)




                                                                                                                                                                                        10 x branch or sanitary
                                                                                                                                     10 x stack NPS                                     building drain NPS
                                                                                                                                                                                        branch or sanitary
                                                                                                                                                                                        building drain
                                                                                                                                                                                                                       EG00675A


                                                                                                     Figure A-2.4.2.1.(4) and (5)
                                                                                                     Suds pressure zones
                                                                                                     Note to Figure A-2.4.2.1.(4) and (5):
                                                                                                     (1) See Sentence 2.4.2.1.(5).


                                                                                                    2-84 Division B                                                                                          National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                          A-2.4.5.1.(2)

                                                                                                    A-2.4.3.3.(1) Waste with Organic Solids. Equipment such as garbage grinders and potato peelers
                                                                                                    produces waste with organic solids. These devices reduce most waste into small-sized particles that will flow
                                                                                                    easily through the drainage system. However, if they are located upstream of the interceptor, the particles
                                                                                                    could block the interceptor.

                                                                                                    A-2.4.4.3.(1) Grease Interceptors. Grease interceptors may be required when it is considered that
                                                                                                    the discharge of fats, oil or grease may impair the drainage system. Information on the design and sizing of
                                                                                                    grease interceptors can be found in ASPE 2012, “Plumbing Engineering Design Handbook, Volume 4, Chapter
                                                                                                    8, Grease Interceptors.”

                                                                                                    A-2.4.4.4.(1) Hazardous Waste. Chemically loaded and bio-hazardous wastes can be dangerous




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    to private or public sewer systems and hazardous to people. The treatment of corrosive and acid waste is
                                                                                                    mandated by this Code. The treatment of chemically loaded effluents is usually regulated by sewage collecting
                                                                                                    and treatment authorities. The treatment of bio-hazardous waste should follow “good engineering practice,”
                                                                                                    such as that described in Laboratory Biosafety Guidelines published by Health Canada. It should be noted
                                                                                                    that bio-hazardous waste disposal systems require specific engineering expertise and remain outside the
                                                                                                    scope of this Code.

                                                                                                    A-2.4.5.1.(2)        Trapping of Sinks and Laundry Trays.


                                                                                                                                                      sink with 3 compartments


                                                                                                                      The fitting and trap                                                          sink with 2 compartments
                                                                                                                      are one NPS larger
                                                                                                                      than the largest
                                                                                                                      fixture outlet pipe.(1)                  developed length(2)
                                                                                                                                                (a)
                                                                                                                                                                                                    developed
                                                                                                                                                        sink                                        length(2)

                                                                                                                                                                                                    sink         sink



                                                                                                                                                                 developed
                                                                                                                                                                 length(2)             developed
                                                                                                                                                                                       length(2)


                                                                                                                                                (b)                                                (c)
                                                                                                                                                                                                                        EG01142B


                                                                                                     Figure A-2.4.5.1.(2)
                                                                                                     Trapping of sinks and laundry trays
                                                                                                     Notes to Figure A-2.4.5.1.(2):
                                                                                                     (1) See Sentence 2.4.9.3.(2).
                                                                                                     (2) The developed length of the fixture outlet pipe must not exceed 1 200 mm. See Article 2.4.8.2.




                                                                                                    National Plumbing Code of Canada 2020                                                                                          Division B 2-85
                                                                                                    A-2.4.5.1.(3)                                                                                                        Division B

                                                                                                    A-2.4.5.1.(3)         Single Traps for Fixture Groups.


                                                                                                                                              fixture outlet pipes

                                                                                                                                              vent
                                                                                                                                                                        CO

                                                                                                                                              fixture drain

                                                                                                                                                                                                    CO




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                              (a) Laboratory sinks or washing machines



                                                                                                                                              floor or shower drains

                                                                                                                                              vent(1)




                                                                                                                                              fixture outlet pipe

                                                                                                                                              (b) Floor drains and shower drains
                                                                                                                                                                                                    EG01143A


                                                                                                     Figure A-2.4.5.1.(3)
                                                                                                     Single traps for fixture groups
                                                                                                     Note to Figure A-2.4.5.1.(3):
                                                                                                     (1) Vent not required for floor drains if the installation conforms to Sentence 2.5.1.1.(3).


                                                                                                    A-2.4.5.1.(5) Location of Trap or Interceptor. An interceptor that replaces a trap must be vented
                                                                                                    in the same way as the trap it replaces. (See Note A-2.4.2.1.(1)(a)(ii) and (e)(vi).) Where an interceptor other
                                                                                                    than an oil interceptor serves a group of fixtures requiring more than one trap, each fixture must be properly
                                                                                                    trapped and vented. (See Article 2.5.5.2. for venting of oil interceptors.)




                                                                                                                                                                                vent




                                                                                                                                           developed length of                  interceptor
                                                                                                                                           fixture outlet pipe not
                                                                                                                                           to exceed 1 200 mm(1)
                                                                                                                                           minimum 38 mm water seal
                                                                                                                                                                                                      EG01144B


                                                                                                     Figure A-2.4.5.1.(5)
                                                                                                     Location of trap or interceptor
                                                                                                     Note to Figure A-2.4.5.1.(5):
                                                                                                     (1) See Sentence 2.4.8.2.(1).


                                                                                                    A-2.4.5.2.(1) Untrapped Leader. When an untrapped leader drains to a combined building sewer,
                                                                                                    clearance requirements are the same as for vent terminals. (See also Note A-2.5.6.5.(4).)


                                                                                                    2-86 Division B                                                                                    National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                      A-2.4.5.3.(1)

                                                                                                    A-2.4.5.3.(1) Subsoil Drainage Connections. This Code does not regulate the installation of subsoil
                                                                                                    drainage pipes, but does regulate the connection of such pipes to the plumbing system. The intent of this
                                                                                                    Article is to place a trap between the subsoil drainage pipe and the sanitary drainage system. The cleanout
                                                                                                    must be installed in accordance with Sentence 2.4.7.1.(2). A trap or sump may be provided specifically for
                                                                                                    the subsoil drains, or advantage may be taken of the trap of a floor drain or storm water sump as shown
                                                                                                    in Figure A-2.4.5.3.(1).


                                                                                                                                     trapped floor drain acts as trap
                                                                                                                                     and cleanout for subsoil drains
                                                                                                                                     sanitary building drain




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                     may require backwater valves(1)



                                                                                                                                                                               FD
                                                                                                                                                          CO
                                                                                                                                                           CO

                                                                                                                                                                                 stack
                                                                                                                                     separate trap (with cleanout) for subsoil drains

                                                                                                                                     (a) Connections to sanitary drainage system (plan view)




                                                                                                                                                                        CO
                                                                                                                                     may require backwater
                                                                                                                                     valves(1)


                                                                                                                                     (b) Trapped sump                                    EG01145B


                                                                                                     Figure A-2.4.5.3.(1)
                                                                                                     Subsoil drainage connections
                                                                                                     Note to Figure A-2.4.5.3.(1):
                                                                                                     (1) See Sentence 2.4.6.4.(5).




                                                                                                    National Plumbing Code of Canada 2020                                                               Division B 2-87
                                                                                                    A-2.4.5.4.(1)                                                                                                       Division B

                                                                                                    A-2.4.5.4.(1)      Location of Building Traps.



                                                                                                                                                         nominal pipe size of
                                                                                                                                                         fresh air inlet not to be
                                                                                                                                                         less than NPS 4
                                                                                                                                                         cleanout required
                                                                                                                                                         on building trap
                                                                                                                          1m
                                                                                                         building sewer
                                                                                                                                                             building drain




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                         this distance as
                                                                                                         short as possible
                                                                                                         not more than 1.2 m
                                                                                                                                                         fresh air inlet
                                                                                                         (a) Building trap inside building
                                                                                                                                                         accessible manhole             COs


                                                                                                                                                             (b) Building trap outside building                            EG01146A


                                                                                                     Figure A-2.4.5.4.(1)
                                                                                                     Location of building traps


                                                                                                    A-2.4.5.5.(1) Maintaining Trap Seals. Periodic manual replenishment of the water in a trap is
                                                                                                    considered to be an equally effective means of maintaining the trap seal in floor drains in residences. Under
                                                                                                    pressure differential conditions, special measures are necessary to maintain trap seals.




                                                                                                                                                                                                  connected below
                                                                                                                                                                          FD                      back-siphonage
                                                                                                                               FD
                                                                                                                                                                                                  preventer



                                                                                                                          (a) Flush tank                            (b) Flush valve

                                                                                                                                                                                                  cold water pipe
                                                                                                                                                                                                  primer valve
                                                                                                                                               indirect
                                                                                                                                               clear-water                                        back-siphonage
                                                                                                                               FD              waste                          FD                  preventer



                                                                                                                          (c) Indirect waste                        (d) Trap seal primer                     EG01147A


                                                                                                     Figure A-2.4.5.5.(1)
                                                                                                     Maintaining trap seals


                                                                                                    A-2.4.6.3. Arrangement of Piping at Sump. In most installations, controls will be installed in
                                                                                                    conjunction with a float to automatically empty the sump. If such controls are not provided, the capacity of the
                                                                                                    sump should equal the maximum inflow to the sump that is expected to occur during any 24 h period.


                                                                                                    2-88 Division B                                                                               National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                                 A-2.4.7.1.(6)

                                                                                                                                to building sewer (downstream
                                                                                                                                of building trap if one is installed)       (1)


                                                                                                                                shut-off valve
                                                                                                                                check valve
                                                                                                                                approved pressure                                    watertight and airtight cover to be
                                                                                                                                pipe and fittings                                    provided if sump receives sewage
                                                                                                                                union


                                                                                                                                sump




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                pump or ejector
                                                                                                                                sub-drainage system                                                              EG01148B


                                                                                                     Figure A-2.4.6.3.
                                                                                                     Arrangement of piping at sump
                                                                                                     Note to Figure A-2.4.6.3.:
                                                                                                     (1) See Article 2.5.7.7. for sizing of required vent if sump receives sewage.


                                                                                                    A-2.4.6.4.(3) Protection from Backflow Caused by Surcharge. The requirement in
                                                                                                    Sentence 2.4.6.4.(3) is intended to apply when, in the opinion of the authority having jurisdiction, there is
                                                                                                    danger of backup from a public sewer.


                                                                                                                                                                            LAV
                                                                                                                                                                 LAV
                                                                                                                           backwater valves                                                 stack
                                                                                                                           on individual fixture                       WC
                                                                                                                           drains(1)                  WC

                                                                                                                           subsoil drains

                                                                                                                                                                                            LAV

                                                                                                                           backwater valve
                                                                                                                           on branch(2)                                                FD
                                                                                                                                                                          LAV               subsoil drains connected to the
                                                                                                                                                                                            upstream side of a trapped
                                                                                                                          backwater valve if backflow                  FD                   backwater valve or a separate
                                                                                                                          protection required for floor drain(1)                            trap and backwater valve(3)
                                                                                                                                                                                                                            EG01149C


                                                                                                     Figure A-2.4.6.4.(3)
                                                                                                     Protection from backflow caused by surcharge
                                                                                                     Notes to Figure A-2.4.6.4.(3):
                                                                                                     (1) See Sentence 2.4.6.4.(1).
                                                                                                     (2) See Sentence 2.4.6.4.(2).
                                                                                                     (3) See Sentence 2.4.6.4.(3).


                                                                                                    A-2.4.7.1.(6) Cleanouts for Drainage Systems. To accommodate the limitations of sewer cleaning
                                                                                                    equipment, the cleanout should be located as close as possible to the exterior wall of the building, either inside
                                                                                                    or outside, and be accessible for sewer cleaning equipment.




                                                                                                    National Plumbing Code of Canada 2020                                                                                              Division B 2-89
                                                                                                    A-2.4.7.1.(9)                                                                                                                       Division B

                                                                                                    A-2.4.7.1.(9)         Cleanouts for Food Receptacle Drip Pipes.



                                                                                                                                                                         food receptacle



                                                                                                                                                              CO

                                                                                                                                                              drip pipe
                                                                                                                                                              indirect connection(1)




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                              sanitary drainage system             EG01150B


                                                                                                     Figure A-2.4.7.1.(9)
                                                                                                     Cleanouts for food receptacle drip pipes
                                                                                                     Note to Figure A-2.4.7.1.(9):
                                                                                                     (1) See Article 2.4.2.1.


                                                                                                    A-2.4.7.1.(10) Cleanouts for Fixture Drains. A trap cleanout plug cannot be used as a cleanout
                                                                                                    for a fixture drain.

                                                                                                    A-2.4.8.1.(1) Minimum Slope. Although slopes below 1 in 100 are permitted for pipes over NPS 4, they
                                                                                                    should be used only where necessary. Steeper slopes and higher velocities will help to keep pipes clean by
                                                                                                    moving heavier solids that might tend to clog the pipes.

                                                                                                    A-2.4.8.2.(1)         Island Fixture Installation.



                                                                                                                             sink                                                           sink              counter
                                                                                                                                                                vent(1)
                                                                                                                                                                                                                         fixture outlet pipe
                                                                                                                                                        fixture outlet


                                                                                                                          1 200 mm
                                                                                                                                                                                                                         one NPS larger
                                                                                                                                                        pipe                                                             than NPS of trap
                                                                                                                                                        CO                                          A(2)                 CO

                                                                                                             floor                                                                  floor

                                                                                                             trap access
                                                                                                             required                            A(2)
                                                                                                                                           (a)                                                       (b)                      A(2)
                                                                                                                                                                                                                                               EG02009A


                                                                                                     Figure A-2.4.8.2.(1)
                                                                                                     Island fixture installation(3)
                                                                                                     Notes to Figure A-2.4.8.2.(1):
                                                                                                     (1) Nominal pipe size of vent to be in accordance with Article 2.5.6.3.
                                                                                                     (2) The fall of A cannot exceed the nominal pipe size of the fixture trap and its length depends on the nominal pipe size of the fixture trap:
                                                                                                             • for NPS 1½, A = 1.8 m
                                                                                                             • for NPS 2, A = 2.4 m
                                                                                                             • for NPS 3, A = 3.6 m
                                                                                                     (3) See also Article 2.5.1.1.


                                                                                                    2-90 Division B                                                                                                National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                      A-2.4.10.

                                                                                                    A-Table 2.4.9.3. Hydraulic Loads for Laundry Traps and Floor Drains. When determining
                                                                                                    the hydraulic load on a pipe, no allowance need be made for a load from a domestic clothes washer when
                                                                                                    discharged to a laundry tray since the hydraulic load from the laundry tray is sufficient. Also no hydraulic load
                                                                                                    is required from a floor drain in a washroom since it is for emergency use only.

                                                                                                    A-2.4.9.3.(2) Continuous Wastes. Fixture outlet pipes that are common to 2 or 3 compartments or
                                                                                                    fixtures are sometimes referred to as continuous wastes and are not considered to be branches. (See also
                                                                                                    Note A-2.4.5.1.(2).)

                                                                                                    A-2.4.9.3.(3)     Standpipe Illustration.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                      standpipe                     standpipe


                                                                                                                     clothes washer                                    clothes washer


                                                                                                                                             600 mm                                             600 mm
                                                                                                                                                                                                            CO


                                                                                                                                                                  CO
                                                                                                                                              hose                                        hose

                                                                                                                                   The standpipe must extend above the flood level rim
                                                                                                                                   of the washer and measure a minimum of 600 mm.                        EG02005A


                                                                                                     Figure A-2.4.9.3.(3)
                                                                                                     Standpipe installation for clothes washers


                                                                                                    A-2.4.10.    Determination of Hydraulic Loads and Nominal Pipe Sizes of Drainage Pipes.

                                                                                                        Hydraulic Loads

                                                                                                        The hydraulic load that is imposed by a fixture is represented by a factor called a fixture unit. Fixture
                                                                                                        units are dimensionless and take into account the rate of discharge, time of discharge and frequency of
                                                                                                        discharge of the fixture.
                                                                                                        Confusion often arises when attempts are made to convert fixture units to litres per second because there is
                                                                                                        no straightforward relationship between the two. The proportion of the total number of fixtures that can be
                                                                                                        expected to discharge simultaneously in a large system is smaller than in a small system. For example,
                                                                                                        doubling the number of fixtures in a system will not double the peak flow that the system must carry,
                                                                                                        although of course the flow will be increased somewhat. Figure A-2.4.10.-A shows the relationship that
                                                                                                        was used in constructing the tables of capacities of stacks, branches, sanitary building drains and sanitary
                                                                                                        building sewers (Tables 2.4.10.6.-A to 2.4.10.6.-C).
                                                                                                        Although the curve in Figure A-2.4.10.-A was used to prepare the Code tables, it was not included in the
                                                                                                        National Plumbing Code. Instead, a single approximate conversion factor is given in the Code so that
                                                                                                        a continuous flow from a fixture may be converted from litres per second to fixture units in order to
                                                                                                        determine the total hydraulic load on the sanitary drainage system. The conversion factor, which is given in
                                                                                                        Sentence 2.4.10.3.(1), is 31.7 fixture units per litres per second. The discharge from a continuous flow fixture
                                                                                                        in litres per second when multiplied by 31.7 gives the hydraulic load in fixture units, and that load is added
                                                                                                        to the fixture unit load from other fixtures to give the total load that the sanitary drainage pipe must carry.
                                                                                                        The hydraulic load that is produced by storm water runoff depends both on the size of the area that
                                                                                                        is drained and local rainfall intensity. The capacities of storm drainage pipes and combined sewers in
                                                                                                        Tables 2.4.10.9., 2.4.10.10. and 2.4.10.11. have been expressed in terms of the number of litres that they can
                                                                                                        carry when the local rainfall intensity is 1 mm in 15 min. The hydraulic load for a particular location is
                                                                                                        obtained by simply multiplying the rainfall intensity figure given in Appendix C of Division B of the NBC
                                                                                                        by the actual area drained as specified in Sentence 2.4.10.4.(1).


                                                                                                    National Plumbing Code of Canada 2020                                                                           Division B 2-91
                                                                                                    A-2.4.10.                                                                                            Division B

                                                                                                                                          40




                                                                                                                                          30



                                                                                                                            Demand, L/s
                                                                                                                                          20




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                          10




                                                                                                                                          0
                                                                                                                                               0   500   1 000   1 500      2 000   2 500     3 000
                                                                                                                                                                 Fixture units                EG01151A


                                                                                                          Figure A-2.4.10.-A
                                                                                                          Relationship between fixture units and demand


                                                                                                        In the case of restricted-flow drains, the hydraulic load from storm water runoff must be calculated using
                                                                                                        manufacturer discharge flow rates of specific drains in the case of roofs, and water-flow restrictors in
                                                                                                        the case of paved areas.
                                                                                                        When plumbing fixtures are connected to a combined sewer, the hydraulic load from the fixtures must be
                                                                                                        converted from fixture units to litres or, in the case of continuous flow, from litres per second to litres so
                                                                                                        that these loads can be added to the hydraulic loads from roofs and paved surfaces. As already pointed out,
                                                                                                        the relationship between fixture units and litres per second and, consequently, the relationship between
                                                                                                        fixture units and litres is not straightforward, and an approximate conversion factor has been adopted. The
                                                                                                        conversion factor given in Sentence 2.4.10.5.(1) is 9.1 L/fixture unit, except where the load is less than 260
                                                                                                        fixture units in which case a round figure of 2 360 L is to be used. In the case of continuous-flow fixtures
                                                                                                        that are connected to combined sewers or storm sewers, the conversion factor given in Sentence 2.4.10.3.(2)
                                                                                                        is 900 L per L/s. This conversion factor is not an approximation but an exact calculation.
                                                                                                        The conversion factors given in Sentences 2.4.10.3.(1) and 2.4.10.5.(1) are designed to convert in one
                                                                                                        direction only, and must not be used to convert from fixture units to litres per second in the one instance,
                                                                                                        nor from litres to fixture units in the other instance.
                                                                                                        In summary, it should be noted that
                                                                                                          (a) in sanitary drainage systems, all hydraulic loads are converted to fixture units, and
                                                                                                         (b) in storm drainage systems or combined drainage systems, all hydraulic loads are converted to litres.

                                                                                                        Procedure for Selecting Nominal Pipe Sizes

                                                                                                        The following is an outline, with examples, of the procedures to be followed in determining the nominal
                                                                                                        pipe size of each section of drainage piping.
                                                                                                         (1) Sanitary drainage pipes, such as branches, stacks, building drains or building sewers:
                                                                                                               (a) Determine the load in fixture units from all fixtures except continuous-flow fixtures;
                                                                                                               (b) Determine the load in litres per second from all continuous-flow fixtures and multiply the
                                                                                                                   number of litres per second by 31.7 to obtain the number of fixture units;
                                                                                                               (c) Add loads (a) and (b) to obtain the total hydraulic load on the pipe in fixture units; and
                                                                                                               (d) Consult the appropriate table from Table 2.4.10.6.-A, 2.4.10.6.-B or 2.4.10.6.-C to select the
                                                                                                                   nominal pipe size.
                                                                                                                  (Note that no pipe may be smaller than the NPS permitted in Subsection 2.4.9.)
                                                                                                         (2) Storm drainage pipes, such as gutters, leaders, horizontal pipes, building drains or building sewers:


                                                                                                    2-92 Division B                                                                 National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                                        A-2.4.10.

                                                                                                                 (a) Determine the area in square metres of roofs and paved surfaces according to
                                                                                                                      Sentence 2.4.10.4.(1);
                                                                                                                 (b) Determine the local rainfall intensity (15 min rainfall) from Appendix C of Division B of the NBC;
                                                                                                                 (c) Multiply (a) by (b) to obtain the hydraulic load in litres;
                                                                                                                 (d) If a fixture discharges a continuous flow to the storm system, multiply its load in litres per
                                                                                                                      second by 900 to obtain the hydraulic load in litres;
                                                                                                                 (e) If flow control roof drains are used, compute the discharge rate based on rain intensity, retention
                                                                                                                      duration, accumulation height and roof area from the roof drain manufacturers' data;
                                                                                                                  (f) Add loads (c) or (e), and (d) to obtain the total hydraulic load on the pipe in litres; and
                                                                                                                 (g) Consult the appropriate table from Table 2.4.10.9., 2.4.10.10. or 2.4.10.11. to select the nominal
                                                                                                                      pipe size of the pipe or gutter.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                   (Note that no pipe may be smaller than the NPS permitted in Subsection 2.4.9.)
                                                                                                         (3) Combined drainage pipes, such as building sewers:
                                                                                                              (a) Determine the total load in fixture units from all fixtures except continuous-flow fixtures;
                                                                                                              (b) If the fixture unit load exceeds 260, multiply it by 9.1 to determine the equivalent hydraulic load
                                                                                                                   in litres. If the fixture unit load is 260 or fewer fixture units, the hydraulic load is 2 360 L;
                                                                                                              (c) Obtain the hydraulic load from roofs and paved surfaces in the same manner as for storm drains
                                                                                                                   (see 2(a), (b), (c) and (e));
                                                                                                              (d) Obtain the hydraulic load in litres from any continuous-flow source that is connected to the
                                                                                                                   sanitary or storm drainage system in the same manner as for storm drainage pipes (see 2(d));
                                                                                                              (e) Add hydraulic loads (b), (c) and (d) to obtain the total hydraulic load on the pipe in litres; and
                                                                                                               (f) Consult Table 2.4.10.9. to select the nominal pipe size.
                                                                                                                       (Note that no pipe may be smaller than the NPS permitted in Subsection 2.4.9.)

                                                                                                        Examples

                                                                                                       Example 1: Determination of the nominal pipe size of storm drainage components for the building shown in
                                                                                                      Figures 1-1 and 1-2

                                                                                                        Step No. 1: Determine the hydraulic load from the roofs.

                                                                                                       Area drained by gutter                                                                               = 162 m2
                                                                                                       Area drained by roof drain                                                                           = 230.4 m2
                                                                                                       If the local rainfall intensity is 25 mm:
                                                                                                           the load on the gutter (leader No. 2) is (25 × 162)                                              = 4 050 L
                                                                                                           the load on the roof drain (leader No. 1) is (25 × 230.4)                                        = 5 760 L
                                                                                                       If the local rainfall intensity is 15 mm:
                                                                                                           the load on the gutter (leader No. 2) is (15 × 162)                                              = 2 430 L
                                                                                                           the load on the roof drain (leader No. 1) is (15 × 230.4)                                        = 3 456 L


                                                                                                        Step No. 2: Determine the nominal pipe size of storm drainage components.

                                                                                                        Using the appropriate hydraulic loads, the nominal pipe size of storm drainage components can be determined from
                                                                                                      Tables 2.4.10.9., 2.4.10.10. and 2.4.10.11. These values are tabulated in Table 1-2 for rainfall intensities of 25 mm and 15 mm in 15 min.




                                                                                                    National Plumbing Code of Canada 2020                                                                                              Division B 2-93
                                                                                                    A-2.4.10.                                                                                                                   Division B

                                                                                                                                                                       9m



                                                                                                                                                   3.6 m
                                                                                                                                                                        18 m

                                                                                                                   area of roof                                                                                  area of horizontal
                                                                                                                                                                                                                 projection surface
                                                                                                                   11 x 18 = 198 m2                                                                              18 x 9 = 162 m2
                                                                                                                                                        RD
                                                                                                                   1/2 area of largest
                                                                                                                   adjacent vertical surface
                                                                                                                   1/2 x 3.6 x 18 = 32.4 m2                                                                      gutter




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                                                                 leader
                                                                                                                   area drained by RD                      11 m
                                                                                                                   198 + 32.4 = 230.4 m2
                                                                                                                                                                                                                                EG01152A


                                                                                                        Figure 1-1
                                                                                                        Storm drainage areas (example 1)


                                                                                                                                           gutter 1 in 200
                                                                                                                                                                       162 m2
                                                                                                                                                                  2
                                                                                                                                                       230.4 m
                                                                                                                                           leader 2


                                                                                                                                           leader 1


                                                                                                                                           storm building drain,
                                                                                                                                           1 in 100
                                                                                                                                           storm building sewer,
                                                                                                                                           1 in 100                                              EG01153A


                                                                                                        Figure 1-2
                                                                                                        Storm drainage components (example 1) (elevation view)


                                                                                                                                                               Table 1-2
                                                                                                                                       Nominal Pipe Sizes of Storm Drainage Pipes (Example 1)
                                                                                                                                                    Forming Part of Note A-2.4.10.

                                                                                                                                                                            15-min Rainfall Intensity, mm
                                                                                                                                                                                                                                      NPC
                                                                                                                                       Area Drained,                   25                                   15
                                                                                                            Storm Drainage Pipes                                                                                                    Reference
                                                                                                                                            m2             Hydraulic        Nominal Pipe      Hydraulic          Nominal Pipe       Table No.
                                                                                                                                                           Load, L           Size, NPS        Load, L             Size, NPS
                                                                                                        Roof drain leader                  230.4             5 760               4              3 456                 3              2.4.10.11.
                                                                                                        Gutter                              162              4 050               8              2 430                 7              2.4.10.10.
                                                                                                        Gutter leader                       162              4 050               3              2 430                2½              2.4.10.11.
                                                                                                        Storm building drain               230.4             5 760               5              3 456                 4              2.4.10.9.
                                                                                                        Storm building sewer               395.8             9 895               6              5 936                 5              2.4.10.9.




                                                                                                    2-94 Division B                                                                                  National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                                     A-2.4.10.

                                                                                                        Example 2: Determination of the nominal pipe size of drainage pipes for buildings

                                                                                                       Figure 2-1 represents an office building with washrooms for men and women, a drinking fountain and cleaner's closet on each typical floor.
                                                                                                      The equipment room with facilities is located in the basement. The building is 18 m by 30 m and is to be built in Kitchener, Ontario.
                                                                                                         A. Hydraulic Load per Typical Floor

                                                                                                                     5 WC @ 6               =        30    fixture units
                                                                                                                     2 UR @ 1½              =         3    fixture units
                                                                                                                     4 LAV @ 1½             =         6    fixture units
                                                                                                                     2 FD @ 3               =         6    fixture units




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                     1 FS @ 3               =         3    fixture units
                                                                                                                     1 DF @ 1               =         1    fixture unit
                                                                                                                                                     49    fixture units


                                                                                                             The reader is left to calculate the nominal pipe size of the branches, one of which must be NPS 4 and another NPS 3 (see
                                                                                                             Subsection 2.4.9.). Therefore the smallest part of the stack must be NPS 4.
                                                                                                         B. Hydraulic Load on Stack
                                                                                                             5 storeys @ 49 fixture units = 245 fixture units
                                                                                                             Table 2.4.10.6.-A permits NPS 4 pipe. Use NPS 4 pipe.
                                                                                                         C. Hydraulic Load on Basement Branch

                                                                                                                     1 WC @ 6                   =       6 fixture units
                                                                                                                     1 LAV @ 1                  =       1 fixture unit
                                                                                                                     2 FD @ 3                   =       6 fixture units
                                                                                                                     1 FS @ 3                   =       3 fixture units
                                                                                                                     Semi-continuous Flow
                                                                                                                     0.23 L/s × 31.7            =       7 fixture units
                                                                                                                                                      23 fixture units


                                                                                                             Table 2.4.10.6.-B permits NPS 3 pipe. Use NPS 3 pipe.
                                                                                                         D. Hydraulic Load on Building Drain

                                                                                                                      From stack                    245    fixture units
                                                                                                                      From basement branch            23   fixture units
                                                                                                                                                    268    fixture units


                                                                                                             Referring to Table 2.4.10.6.-C, at a slope of 1 in 50, an NPS 4 pipe will carry 240 fixture units.
                                                                                                             Referring to Table 2.4.10.6.-C, at a slope of 1 in 25, an NPS 4 pipe will carry 300 fixture units.
                                                                                                             For practical reasons, use an NPS 4 pipe at a slope of not less than 1 in 32.




                                                                                                    National Plumbing Code of Canada 2020                                                                                            Division B 2-95
                                                                                                    A-2.4.10.                                                                                                                     Division B

                                                                                                                                                                    roof 18 m x 30 m
                                                                                                                                                       RD                                       RD




                                                                                                                                           DF        UR         LAV                LAV           typical floor
                                                                                                                                    FS                        FD                   FD            configuration


                                                                                                                                                      WC                              WC




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                            ditto                  ditto




                                                                                                                                                            ditto                 ditto




                                                                                                                                                            ditto                  ditto




                                                                                                                                                            ditto                  ditto



                                                                                                                                             semi-continuous flow
                                                                                                                                             0.23 L/s
                                                                                                                                    LAV
                                                                                                                                               NPS 3 FDs            FS

                                                                                                                                    WC
                                                                                                                                                                                                                              EG01154A


                                                                                                              Figure 2-1
                                                                                                              Building drainage system (example 2)


                                                                                                         E. Storm Load
                                                                                                            Area of roof 18 × 30 = 540 m 2
                                                                                                            Rainfall intensity for Kitchener, taken from Appendix C of Division B of the NBC, is 28 mm in 15 min
                                                                                                            Total hydraulic storm load = 28 × 540 = 15 120 L
                                                                                                            Storm load on each roof drain = 15 120/2 = 7 560 L
                                                                                                         F. Nominal Pipe Size of Horizontal Leaders
                                                                                                            Referring to Table 2.4.10.9., at a slope of 1 in 25, an NPS 4 pipe will carry a load of 8 430 L.
                                                                                                            Referring to Table 2.4.10.9., at a slope of 1 in 100, an NPS 5 pipe will carry a load of 7 650 L.
                                                                                                            Referring to Table 2.4.10.9., at a slope of 1 in 133, an NPS 6 pipe will carry a load of 10 700 L.


                                                                                                    2-96 Division B                                                                                            National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                                 A-2.5.1.1.(3)

                                                                                                             Therefore, use an NPS 5 pipe at a slope of 1 in 100.
                                                                                                         G. Nominal Pipe Size of Vertical Leader
                                                                                                             Table 2.4.10.11. would permit an NPS 5 pipe (19 500 L) but this nominal pipe size is not readily available. For practical reasons,
                                                                                                             use an NPS 6 pipe.
                                                                                                         H. Nominal Pipe Size of Storm Building Drains
                                                                                                             Since a drainage pipe cannot be any smaller than any upstream pipes, the storm building drain must be at least NPS 6 . Referring
                                                                                                             again to Table 2.4.10.9., an NPS 6 pipe will carry a hydraulic load of 17 600 L at a slope of 1 in 50. Therefore use an NPS 6 pipe at a
                                                                                                             slightly higher slope.
                                                                                                          I. Nominal Pipe Size of Combined Building Sewer




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                               (a) Total sanitary load excluding semi-continuous flow 260 fixture units converted to litres (Clause 2.4.10.5.(1)(b)) × 9.1 = 2 366 L
                                                                                                               (b) Semi-continuous flow 0.23 L/s converted to litres (Sentence 2.4.10.3.(2)) × 900 = 207 L
                                                                                                               (c) Storm load 15 120 L
                                                                                                                    Total hydraulic load 17 693 L
                                                                                                             Referring to Table 2.4.10.9., at a slope of 1 in 50, an NPS 6 pipe will carry 17 600 L.
                                                                                                             Referring to Table 2.4.10.9., at a slope of 1 in 25, an NPS 6 pipe will carry 24 900 L.
                                                                                                             Therefore, use an NPS 6 pipe at a slope of not less than 1 in 32.


                                                                                                    A-2.4.10.4.(1) Rainfall Intensities. Climate information on rainfall intensities for various cities can
                                                                                                    be found in Appendix C of Division B of the NBC.
                                                                                                    When calculating the hydraulic load from a roof or paved surface, it should be noted that a 1 mm depth of
                                                                                                    water on 1 m2 of surface is equivalent to 1 L.

                                                                                                    A-2.5.1.1.(3)        Trapping of Floor Drains.


                                                                                                                                                floor drain trap NPS 3 or larger
                                                                                                                                               fixture drain
                                                                                                                                                fixture drain, branch
                                                                                                                                                or stack
                                                                                                                                                                                       A(1)




                                                                                                                                                                                 (a)


                                                                                                                                                fixture drain

                                                                                                                                                building drain, branch or
                                                                                                                                                nominally horizontal
                                                                                                                                                offset in a stack
                                                                                                                                                                                              A(1)

                                                                                                                                                floor drain trap NPS 3 or larger

                                                                                                                                                                                 (b)
                                                                                                                                                                                                       EG01155B


                                                                                                     Figure A-2.5.1.1.(3)
                                                                                                     Trapping of floor drains
                                                                                                     Note to Figure A-2.5.1.1.(3):
                                                                                                     (1) Length of “A” must be at least 450 mm and its fall must not exceed the NPS of the pipe. See also the explanation given in Sentence 2.5.6.3.(1)
                                                                                                         regarding the fall on fixture drains.


                                                                                                    National Plumbing Code of Canada 2020                                                                                               Division B 2-97
                                                                                                    A-2.5.1.1.(4)                                                                                                         Division B

                                                                                                    A-2.5.1.1.(4)        Venting not Required.


                                                                                                           sanitary building drain                                          leader
                                                                                                           subsoil drainage pipe                                            storm building drain

                                                                                                                                              basement                      vent not required for trap
                                                                                                                                                                            serving a storm drainage
                                                                                                                                                                            system(2)


                                                                                                                                                                                                             sanitary building




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                                                             drain
                                                                                                           vent not required for trap serving                                                                combined building sewer
                                                                                                           subsoil drainage pipe(1)

                                                                                                                                     (a)                                                           (b)




                                                                                                                                                                         vent not required for traps that form part
                                                                                                                                                                         of an indirect drainage system(3)

                                                                                                                                                                         this trap to be vented
                                                                                                                                                                         in an approved manner

                                                                                                                                                                   (c)
                                                                                                                                                                                                                                 EG01156B


                                                                                                     Figure A-2.5.1.1.(4)
                                                                                                     Venting not required
                                                                                                     Notes to Figure A-2.5.1.1.(4):
                                                                                                     (1) See Subclause 2.5.1.1.(4)(a)(i).
                                                                                                     (2) See Subclause 2.5.1.1.(4)(a)(ii).
                                                                                                     (3) See Clause 2.5.1.1.(4)(b).


                                                                                                    A-2.5.2.1. Wet Venting. Single-storey and multi-storey wet venting has been replaced with wet venting
                                                                                                    (Article 2.5.2.1.) and circuit venting (Article 2.5.3.1.).
                                                                                                    The information and figures presented in this Note are examples of the most common installation practices that
                                                                                                    meet NPC requirements. However, the examples shown do not preclude other installations that would also
                                                                                                    conform to NPC requirements.


                                                                                                                                                                                        continuous vent

                                                                                                                                                             lavatory basin

                                                                                                                                                                                          lavatory basin
                                                                                                                                                             shower drain (NPS 2)
                                                                                                                                             flush tank WC


                                                                                                                                                                                  shower drain (NPS 2)

                                                                                                                                                              flush tank WC
                                                                                                                                                                                                         EG02013A


                                                                                                     Figure A-2.5.2.1.-A
                                                                                                     Example of wet venting described in Clause 2.5.2.1.(1)(b)



                                                                                                    2-98 Division B                                                                                  National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                                   A-2.5.2.1.

                                                                                                                                                                                 stack vent

                                                                                                                                                                                 kitchen sink
                                                                                                             stack vent




                                                                                                                                                  lavatory basin
                                                                                                                                                                                kitchen sink                             lavatory basin


                                                                                                            stack (wet vent)




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                  siphon jet urinal             kitchen sink
                                                                                                                                                                                                                          lavatory basin
                                                                                                             flush tank WC

                                                                                                                                                  stack (wet vent)              flush tank WC

                                                                                                                                                                                                                          lavatory basin
                                                                                                             branch                               flush tank WC                          bathtub
                                                                                                                                                                                                                          flush tank WC



                                                                                                                                                                                 symmetrical
                                                                                                                                                                                 connection(1)
                                                                                                                                                                                                                                    EG02014A


                                                                                                     Figure A-2.5.2.1.-B
                                                                                                     Example of wet venting described in Clause 2.5.2.1.(1)(c)
                                                                                                     Note to Figure A-2.5.2.1.-B:
                                                                                                     (1) A symmetrical connection is accomplished with a manufactured fitting that has two or more inlets and connects two or more waste lines
                                                                                                         to a vent or wet vent.




                                                                                                                                                         continuous vent                                                  continuous vent




                                                                                                                                                                                                                         lavatory basin
                                                                                                                                                         lavatory basin
                                                                                                                                                                                   bathtub

                                                                                                                                  branch


                                                                                                                                                                                                                         flush tank WC
                                                                                                                                                         bathtub
                                                                                                                                  flush tank WC
                                                                                                                                                                                   This symmetrical
                                                                                                                                                                                   connection is acceptable.
                                                                                                                                                                                                                                   EG02015A


                                                                                                     Figure A-2.5.2.1.-C
                                                                                                     Example of wet venting described in Clause 2.5.2.1.(1)(d)




                                                                                                    National Plumbing Code of Canada 2020                                                                                           Division B 2-99
                                                                                                    A-2.5.2.1.                                                                                                               Division B

                                                                                                                                                                       continuous vent

                                                                                                                                                                       lavatory basin


                                                                                                                                                                                               lavatory basin

                                                                                                                                                                       branch
                                                                                                                                         bathtub                       (wet vent)




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                                               emergency floor
                                                                                                                                                                                               drain (NPS 3)


                                                                                                                                         branch                                                         EG02016A


                                                                                                     Figure A-2.5.2.1.-D
                                                                                                     Example of wet venting described in Clause 2.5.2.1.(1)(e)




                                                                                                                                                          continuous vent




                                                                                                                                                          lavatory basin                                           individual and
                                                                                                                       fixture drain(1) (wet vent)                                                                 continuous vent
                                                                                                                       (4 fixture units; NPS 3;
                                                                                                                       WC load not counted)

                                                                                                                       branch (wet vent)
                                                                                                                                                                                    fixture drain
                                                                                                                                                                                    (1.5 fixture units;            kitchen sink
                                                                                                                      bathtub
                                                                                                                                                                                    NPS 1 1/2)
                                                                                                                                                                                    separately vented
                                                                                                                                                                                    fixture drain
                                                                                                                                               flush tank WC


                                                                                                                       branch (NPS 3)
                                                                                                                       bathroom group = 6 fixture units
                                                                                                                           kitchen sink = 1.5 fixture units
                                                                                                                                  Total = 7.5 fixture units                                                                  EG02017A


                                                                                                     Figure A-2.5.2.1.-E
                                                                                                     Example of wet venting described in Clause 2.5.2.1.(1)(f)
                                                                                                     Note to Figure A-2.5.2.1.-E:
                                                                                                     (1) The load from the separately vented kitchen sink is included when sizing this pipe.




                                                                                                    2-100 Division B                                                                                      National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                                 A-2.5.2.1.


                                                                                                                                                                          continuous vent



                                                                                                                                                                           lavatory basin                                   individual and
                                                                                                                                                                                                                            continuous vent
                                                                                                                                      branch(1) (wet vent) (9 fixture units;
                                                                                                                                      NPS 4; WC load not counted)
                                                                                                                                      2-head shower
                                                                                                                                                                                                                            lavatory basin




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                                                 fixture drain (1 fixture
                                                                                                                                      branch (wet vent)                                          unit; NPS 1 1/4)

                                                                                                                                                                                    2-head shower



                                                                                                                                            maximum 3 m                                         separately vented
                                                                                                                                                                                                fixture drain
                                                                                                                              branch (NPS 4)
                                                                                                           3 lavatory basins = 3 fixture units                                       flush tank WC
                                                                                                        2 x 2-head showers = 6 fixture units
                                                                                                            1 flush tank WC = 4 fixture units
                                                                                                                       Total = 13 fixture units                                                                                      EG02018C


                                                                                                     Figure A-2.5.2.1.-F
                                                                                                     Example of wet venting described in Clause 2.5.2.1.(1)(f)
                                                                                                     Note to Figure A-2.5.2.1.-F:
                                                                                                     (1) The load from the separately vented lavatory basin is included when sizing this pipe.




                                                                                                                                      ice box                         stack vent or                    individual and
                                                                                                                                                                      continuous vent                  continuous vent



                                                                                                                                                                      lavatory basin
                                                                                                                           branch or stack(1)
                                                                                                                           (wet vent)
                                                                                                                           (3.5 fixture units; NPS 2)
                                                                                                                                                                                                       bar sink
                                                                                                                                                                                                       (NPS 1 1/2 trap)



                                                                                                                                                                      commercial                       separately vented
                                                                                                                                                                      dishwasher                       fixture drain


                                                                                                                                                                branch or sanitary building drain (NPS 3)
                                                                                                                                                        ice box = 1 fixture unit
                                                                                                                                                lavatory basin = 1 fixture unit
                                                                                                                                                       bar sink = 1.5 fixture units
                                                                                                                                        commercial dishwasher = 3 fixture units
                                                                                                                                                          Total = 6.5 fixture units                      EG02019B

                                                                                                     Figure A-2.5.2.1.-G
                                                                                                     Example of wet venting described in Clause 2.5.2.1.(1)(f)
                                                                                                     Note to Figure A-2.5.2.1.-G:
                                                                                                     (1) The load from the separately vented bar sink is included when sizing this pipe.


                                                                                                    National Plumbing Code of Canada 2020                                                                                       Division B 2-101
                                                                                                    A-2.5.2.1.                                                                                                                   Division B

                                                                                                                                                       continuous vent(1)
                                                                                                                                                       (6 fixture units;
                                                                                                                                                       NPS 1 1/2)



                                                                                                                                                                                                                  individual and
                                                                                                                                                        lavatory basin                                            continuous vent



                                                                                                                       branch (wet vent)               fixture drain
                                                                                                                                                       (wet vent)




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                       bathtub
                                                                                                                                                                                                                  kitchen sink
                                                                                                                                                                              fixture drain
                                                                                                                                                                              (1.5 fixture units; NPS 1 1/2)

                                                                                                                                                        flush tank WC
                                                                                                                                                                                                                  separately vented
                                                                                                                            branch (NPS 3)                                                                        fixture drain
                                                                                                                            bathroom group = 6 fixture units
                                                                                                                                kitchen sink = 1.5 fixture units
                                                                                                                                      Total = 7.5 fixture units                                                              EG02020A


                                                                                                     Figure A-2.5.2.1.-H
                                                                                                     Example of wet venting described in Clause 2.5.2.1.(1)(g)
                                                                                                     Note to Figure A-2.5.2.1.-H:
                                                                                                     (1) The load from the separately vented kitchen sink is not included when sizing this pipe.


                                                                                                                                                                                              stack vent


                                                                                                                                                                    drinking fountain



                                                                                                                                                  flush tank WC
                                                                                                                                                                                              stack (wet vent)
                                                                                                                                                                     lavatory basin

                                                                                                                                                                                              kitchen sink
                                                                                                                                      bathtub

                                                                                                                                                                                              nominally horizontal
                                                                                                                                                                                              offset(1)

                                                                                                                                                                                                             EG02022A


                                                                                                     Figure A-2.5.2.1.-I
                                                                                                     Example of wet venting described in Clause 2.5.2.1.(1)(i)
                                                                                                     Note to Figure A-2.5.2.1.-I:
                                                                                                     (1) “Offset” means the piping that connects the ends of 2 pipes that are parallel.




                                                                                                    2-102 Division B                                                                                       National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                             A-2.5.2.1.


                                                                                                                                                                              stack vent



                                                                                                                                nominally horizontal offset
                                                                                                                                (maximum length 1.2 m                         lavatory basin
                                                                                                                                for pipes that are NPS 2
                                                                                                                                or less)                                      stack (wet vent)
                                                                                                                                                                              (1 fixture unit; NPS 1 1/2)

                                                                                                                                                               kitchen sink




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                branch (2.5 fixture
                                                                                                                                units; NPS 1 1/2)



                                                                                                                                                                                                     EG02023B


                                                                                                     Figure A-2.5.2.1.-J
                                                                                                     Example of wet venting described in Subclause 2.5.2.1.(1)(i)(i)


                                                                                                                                                                   stack vent


                                                                                                                                                               lavatory basin

                                                                                                                        nominally horizontal offset                                 lavatory basin
                                                                                                                        (maximum length 2.5 m for
                                                                                                                        pipes larger than NPS 2)                                    (NPS 1 1/4 trap)
                                                                                                                                                      kitchen sink

                                                                                                                                                                        kitchen sink

                                                                                                                        branch (5 fixture units; NPS 2)                             stack (wet vent)
                                                                                                                                                                                    (2 fixture units; NPS 1 1/2)


                                                                                                                                                                                                                EG02024B


                                                                                                     Figure A-2.5.2.1.-K
                                                                                                     Example of wet venting described in Subclause 2.5.2.1.(1)(i)(ii)


                                                                                                                                                              continuous vent

                                                                                                                                                              lavatory basin


                                                                                                                                                                                       lavatory basin
                                                                                                                                                branch (wet vent)
                                                                                                                                  bathtub       (2 fixture units; NPS 1 1/2)           (NPS 1 1/4 trap)

                                                                                                                                                                                       emergency floor
                                                                                                                                                                                       drain (NPS 3)
                                                                                                                                                branch (wet vent)
                                                                                                                                                (2 fixture units; NPS 3)
                                                                                                                                                branch                                           EG02025C


                                                                                                     Figure A-2.5.2.1.-L
                                                                                                     Example of wet venting described in Clause 2.5.2.1.(1)(j)


                                                                                                    National Plumbing Code of Canada 2020                                                                                  Division B 2-103
                                                                                                    A-2.5.3.1.                                                                                                 Division B

                                                                                                                                                       flush tank WC           continuous vent

                                                                                                                                                             bathtub




                                                                                                                                          length not restricted                lavatory basin




                                                                                                                                                                                              EG02026A




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                     Figure A-2.5.2.1.-M
                                                                                                     Example of wet venting described in Clause 2.5.2.1.(1)(k)


                                                                                                    A-2.5.3.1. Circuit Venting. Single-storey and multi-storey wet venting has been replaced with wet
                                                                                                    venting (Article 2.5.2.1.) and circuit venting (Article 2.5.3.1.).
                                                                                                    The information and figures presented in this Note are examples of the most common installation practices that
                                                                                                    meet NPC requirements. However, the examples shown do not preclude other installations that would also
                                                                                                    conform to NPC requirements.


                                                                                                                                                                                circuit vent



                                                                                                                                         relief vent




                                                                                                                                                                                      EG02027A


                                                                                                     Figure A-2.5.3.1.-A
                                                                                                     Example of circuit venting described in Sentence 2.5.3.1.(1)



                                                                                                                                        stack              relief vent        circuit vent




                                                                                                                                                                                 WC
                                                                                                                                                                         WC


                                                                                                                                    This installation is permitted because the stack is
                                                                                                                                    downstream of the most downstream circuit-vented fixture
                                                                                                                                    (i.e., the water closet).
                                                                                                                                                                                             EG02029A


                                                                                                     Figure A-2.5.3.1.-B
                                                                                                     Example of circuit venting described in Clause 2.5.3.1.(1)(c)



                                                                                                    2-104 Division B                                                                         National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                            A-2.5.3.1.

                                                                                                                                                                                                                  circuit vent



                                                                                                                                                                               relief vent              individual vent




                                                                                                                                                                                                                  NPS 1 1/2 trap




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                                                         NPS 2 trap
                                                                                                           relief vent     NPS 3 trap       circuit vent

                                                                                                                                                                        Example 1: This installation is permitted because
                                                                                                                                                                                   the NPS 1 1/2 trap is separately vented.

                                                                                                                                                   NPS 2 trap

                                                                                                                                                   circuit vent                                individual and
                                                                                                                                                                                               continuous vent
                                                                                                           NPS 1 1/4 traps                         NPS 1 1/2 trap
                                                                                                                                                                         NPS 1 1/4 trap                             circuit vent


                                                                                                                                                                          relief vent
                                                                                                         Example 2: This installation is permitted because
                                                                                                                    the large traps and the small traps are
                                                                                                                    separately circuit-vented.

                                                                                                                                                                                                                    NPS 2 trap



                                                                                                                                                                  Example 3: This installation is permitted because
                                                                                                                                                                             the NPS 1 1/4 trap is separately vented.

                                                                                                                                                                                                                                   EG02030A


                                                                                                     Figure A-2.5.3.1.-C
                                                                                                     Example of circuit venting described in Sentence 2.5.3.1.(2), which refers to the nominal pipe size of fixture outlets


                                                                                                                                         circuit vent



                                                                                                                                                                                        relief vent
                                                                                                                                                 circuit-vented
                                                                                                                                                 branch




                                                                                                                                         A relief vent is required when fixtures
                                                                                                                                         are circuit-vented.
                                                                                                                                                                                             EG02031B


                                                                                                     Figure A-2.5.3.1.-D
                                                                                                     Example of circuit venting described in Sentence 2.5.3.1.(3)


                                                                                                    National Plumbing Code of Canada 2020                                                                                  Division B 2-105
                                                                                                    A-2.5.3.1.                                                                                                             Division B

                                                                                                                                    stack vent
                                                                                                                                    (acting as a relief vent)                     circuit vent
                                                                                                         2 fixture units
                                                                                                                                    4 fixture units
                                                                                                         stack (wet vent
                                                                                                         acting as a relief vent)




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                         Example 1                                                                       circuit vent (20 fixture
                                                                                                                                                                                         units)
                                                                                                                                                                                                  continuous vent
                                                                                                                                                                                                  (acting as a relief vent)
                                                                                                         stack (more than 6 fixture units)
                                                                                                         This stack may act as the relief             all WCs are 4 fixture units each
                                                                                                         vent (a pipe acting as a relief
                                                                                                         vent may be vertical or horizontal).

                                                                                                                                                                                                                    minimum NPS 2


                                                                                                                                                      branch (acting as                           fixture drain (wet vent
                                                                                                                                                      a relief vent)                              acting as a relief vent)
                                                                                                         Example 2


                                                                                                         stack (more than     relief vent                       circuit vent
                                                                                                         6 fixture units)




                                                                                                                                                                               stack vent (acting as a
                                                                                                                                                                               relief vent)

                                                                                                                                                           bathtub (1.5 fixture units)                       circuit vents (36 fixture
                                                                                                                                                                                                             units; NPS 2)
                                                                                                         Example 3
                                                                                                                                                           stack (more than
                                                                                                                                                                                                    WC (4 fixture units)
                                                                                                                                                           6 fixture units)
                                                                                                                                                                                            stack (acting as a relief vent)
                                                                                                                                                                                            (5.5 fixture units; NPS 3)




                                                                                                                                                                                                     WCs (6 fixture units each)


                                                                                                                                                            Example 4                                                            EG02032A


                                                                                                     Figure A-2.5.3.1.-E
                                                                                                     Example of circuit venting described in Sentence 2.5.3.1.(4)




                                                                                                    2-106 Division B                                                                                National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                                   A-2.5.3.1.

                                                                                                                                           stack (more than         combined               circuit vent
                                                                                                                                           6 fixture units)         relief vent



                                                                                                                                                   symmetrical
                                                                                                                                                   connection(1)

                                                                                                                                                                                                  circuit
                                                                                                                                                                                                  vent




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                                                     EG02033A


                                                                                                     Figure A-2.5.3.1.-F
                                                                                                     Example of circuit venting described in Sentence 2.5.3.1.(5)
                                                                                                     Note to Figure A-2.5.3.1.-F:
                                                                                                     (1) A symmetrical connection is accomplished with a manufactured fitting that has two or more inlets and connects two or more waste lines
                                                                                                         to a vent or wet vent.


                                                                                                                                              This is the preferred location
                                                                                                                                              for the additional circuit vent.

                                                                                                                                              relief vent                                        circuit vent




                                                                                                                                                             45°

                                                                                                                                                                                    45°


                                                                                                                                              circuit-vented branch
                                                                                                                                                                                                       EG02034B


                                                                                                     Figure A-2.5.3.1.-G
                                                                                                     Example of circuit venting described in Clause 2.5.3.1.(6)(a)


                                                                                                                                       This is the preferred location
                                                                                                                                       for the additional circuit vent.


                                                                                                                                       relief vent     circuit-vented                              circuit vent
                                                                                                                                                       branch




                                                                                                                                        branch                                                            EG02035B


                                                                                                     Figure A-2.5.3.1.-H
                                                                                                     Example of circuit venting described in Clause 2.5.3.1.(6)(b)




                                                                                                    National Plumbing Code of Canada 2020                                                                                         Division B 2-107
                                                                                                    A-2.5.3.1.                                                                                                                  Division B


                                                                                                           stack (more than          relief vent                                                        circuit vent
                                                                                                           6 fixture units)

                                                                                                                                                                                                                  minimum NPS 2(2)


                                                                                                                                                                                                                  additional circuit vent(1)




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                    Example 1

                                                                                                                                                                               additional               circuit vent
                                                                                                                                                                               circuit vent(1)

                                                                                                           stack (more than          relief vent
                                                                                                           6 fixture units)




                                                                                                                                                                               minimum NPS 2(2)


                                                                                                                    Example 2




                                                                                                           stack (more than             relief vent                    additional                circuit vent
                                                                                                           6 fixture units)                                            circuit vent(1)




                                                                                                                                                         45°

                                                                                                                                                                                45°


                                                                                                                                                                       minimum NPS 2(2)


                                                                                                                    Example 3                                                                                                         EG02036A


                                                                                                     Figure A-2.5.3.1.-I
                                                                                                     Example of circuit venting described in Sentence 2.5.3.1.(7)
                                                                                                     Notes to Figure A-2.5.3.1.-I:
                                                                                                     (1) Nominal pipe size as per Article 2.5.7.1. and Sentence 2.5.7.3.(1).
                                                                                                     (2) See Sentence 2.5.3.1.(7).




                                                                                                    2-108 Division B                                                                                       National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                                        A-2.5.3.1.

                                                                                                                                                                                                                            circuit vent(1)
                                                                                                                                                                                  additional circuit vent(1)



                                                                                                                  stack (more than relief vent
                                                                                                                  6 fixture units)




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                                                                                      EG02037A


                                                                                                     Figure A-2.5.3.1.-J
                                                                                                     Example of circuit venting described in Sentence 2.5.3.1.(8)
                                                                                                     Note to Figure A-2.5.3.1.-J:
                                                                                                     (1) Connections to circuit vents and to additional circuit vents in accordance with Sentence 2.5.3.1.(6) shall conform to Sentence 2.5.4.5.(1),
                                                                                                         which states that a maximum of 2 fixtures (1.5 fixture units each) shall be connected to the vertical section by means of a double sanitary T.



                                                                                                                                                                                                                               circuit vent

                                                                                                            stack (more than
                                                                                                            6 fixture units)                                                                                                    drain(1)
                                                                                                                             relief vent                          minimum NPS 2
                                                                                                                                                                                                                               NPS 1 1/4 trap



                                                                                                                                                                                                                            NPS 1 1/4 trap

                                                                                                                                                                                                      NPS 1 1/4 trap

                                                                                                                                                                               NPS 1 1/4 trap

                                                                                                                                                       NPS 1 1/4 trap                                                                      EG02038A


                                                                                                     Figure A-2.5.3.1.-K
                                                                                                     Example of circuit venting described in Sentence 2.5.3.1.(9)
                                                                                                     Note to Figure A-2.5.3.1.-K:
                                                                                                     (1) The drain is sized as a branch. The nominal pipe size of the drain should be increased as the load increases.




                                                                                                    National Plumbing Code of Canada 2020                                                                                               Division B 2-109
                                                                                                    A-2.5.3.1.                                                                                                             Division B

                                                                                                                                             stack (more than 6 fixture units)

                                                                                                                                            circuit vent (44 fixture units; NPS 2;
                                                                                                                                            10-m-long circuit vent)
                                                                                                                                             This is the preferred location for the
                                                                                                                                             additional circuit vent.(1)(2) (NPS 1 1/2)

                                                                                                                                             relief vent(1) (NPS 1 1/2)

                                                                                                                                             circuit-vented branch




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                             branch                   all WCs are 4 fixture units each

                                                                                                                                                                                                                                EG02039B


                                                                                                     Figure A-2.5.3.1.-L
                                                                                                     Example of circuit venting described in Sentence 2.5.3.1.(10)
                                                                                                     Notes to Figure A-2.5.3.1.-L:
                                                                                                     (1) The relief vent and the additional circuit vent are one NPS smaller than the circuit vent.
                                                                                                     (2) See Sentence 2.5.7.3.(1).




                                                                                                    2-110 Division B                                                                                     National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                                       A-2.5.3.1.

                                                                                                                                                                                                               circuit vent(1) (45 fixture
                                                                                                                                                                                                               units; NPS 2)
                                                                                                        individual and continuous vent
                                                                                                        (acting as a relief vent) (NPS 1 1/2)


                                                                                                        stack (more than
                                                                                                        6 fixture units)
                                                                                                                                                    all WCs are 4 fixture units each

                                                                                                                 2 fixture units
                                                                                                                                                                                                                                additional circuit




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                                                                                vent (NPS 1 1/2)




                                                                                                                 47 fixture units                                                                                                    1 fixture unit




                                                                                                                                                     Example 1                                                                  minimum NPS 2




                                                                                                                                                                                                      circuit vent

                                                                                                                   individual and continuous vent
                                                                                                                   (acting as a relief vent)


                                                                                                        stack (more than
                                                                                                        6 fixture units)
                                                                                                                                                     all WCs are 4 fixture units each
                                                                                                                                                                                                                     individual and continuous
                                                                                                                   sink with an
                                                                                                                                                                                                                     vent (NPS 1 1/2)
                                                                                                                   NPS 2 trap




                                                                                                                   37 fixture units
                                                                                                                                                                                                                                    lavatory basin



                                                                                                                   29 fixture units
                                                                                                                                                                                                                     circuit vent (6 fixture
                                                                                                                                                    sinks with                                                       units; NPS 1 1/4)
                                                                                                                                                    NPS 1 1/2 traps



                                                                                                                                                     Example 2
                                                                                                                                                                                                                                             EG02040A


                                                                                                     Figure A-2.5.3.1.-M
                                                                                                     Example of circuit venting described in Sentence 2.5.3.1.(11)
                                                                                                     Note to Figure A-2.5.3.1.-M:
                                                                                                     (1) When sizing the circuit vent, do not include fixtures with a hydraulic load of 2 fixture units that are connected downstream of the most
                                                                                                         downstream water closets.




                                                                                                    National Plumbing Code of Canada 2020                                                                                              Division B 2-111
                                                                                                    A-2.5.4.3.                                                                                        Division B

                                                                                                    A-2.5.4.3.     Yoke Vent. In Ontario, yoke vents have traditionally been referred to as modified stack vents.



                                                                                                                                                                        vent header




                                                                                                                                    stack vent


                                                                                                                                                                        vent stack




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                             yoke       vent stack
                                                                                                                                                             vent

                                                                                                                                    12 branches




                                                                                                                                                                       vent stack




                                                                                                                                                                           EG02041A


                                                                                                     Figure A-2.5.4.3.
                                                                                                     Yoke vent




                                                                                                    2-112 Division B                                                                National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                          A-2.5.4.5.(1)

                                                                                                    A-2.5.4.4.(1) Offset Relief Vents. When an offset is greater than 1.5 m, it must be sized the same way as
                                                                                                    a branch or building drain (see Sentence 2.4.10.6.(2)). An offset relief vent is required at points A and B or A
                                                                                                    and C in Figure A-2.5.4.4.(1).




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                         vent stack
                                                                                                                                                                         stack



                                                                                                                                                                         offset relief vent A




                                                                                                           offset relief vent B
                                                                                                           offset relief vent C

                                                                                                                         C or B



                                                                                                                                                                   offset relief vent A         stack

                                                                                                            vent stack



                                                                                                                                                 offset relief vents

                                                                                                                                      m
                                                                                                                                  1.5
                                                                                                                                                      C or B


                                                                                                                                                                               The stack's horizontal offset
                                                                                                                                                                               is greater than 1.5 m and
                                                                                                                                                                               receives discharge of more
                                                                                                                                                                               than 100 fixture units above
                                                                                                                                                                stack          the offset.




                                                                                                                                                                                                         EG02042A


                                                                                                     Figure A-2.5.4.4.(1)
                                                                                                     Offset relief vents


                                                                                                    A-2.5.4.5.(1) Fixture Connections to Vent Pipes. When one or more fixture drains are connected to
                                                                                                    a vent pipe, the vent pipe becomes a wet vent. It must then conform to all the requirements that can apply
                                                                                                    to it as a drainage pipe and a vent pipe.




                                                                                                    National Plumbing Code of Canada 2020                                                                      Division B 2-113
                                                                                                    A-2.5.5.2.                                                                                               Division B

                                                                                                    A-2.5.5.2.      Venting of Oil Interceptors.


                                                                                                                                                                                          connect to plumbing
                                                                                                                                                                                          vent system


                                                                                                                                     minimum NPS 1 1/4(1)



                                                                                                                                       300 mm




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                     minimum NPS 1 1/4(1)

                                                                                                                                     vent opening
                                                                                                                                     between
                                                                                                         inlet                       compartments

                                                                                                                                                                                                                  outlet




                                                                                                                                                        baffles                         inside piping drops, baffles, etc.
                                                                                                                                                                                        to be provided in accordance
                                                                                                                                                                                        with manufacturer’s
                                                                                                                                                                                        recommendations



                                                                                                                                        cross-section of oil interceptor                                            EG02006B


                                                                                                     Figure A-2.5.5.2.
                                                                                                     Venting of oil interceptors
                                                                                                     Note to Figure A-2.5.5.2.:
                                                                                                     (1) See Sentence 2.5.5.2.(4).


                                                                                                    A-2.5.6.2.(2) Vent Pipe Connections. Fittings used to connect vent pipes to nominally horizontal
                                                                                                    sanitary drainage pipes are specified in Subsection 2.2.4.


                                                                                                                                                                     Except for wet vents, vent pipes
                                                                                                                                                                     must be connected above the
                                                                                                                                                                     horizontal centreline.




                                                                                                                                                                     horizontal centreline
                                                                                                                                                                     of sanitary drainage pipe

                                                                                                                                                                                                 EG01164B


                                                                                                     Figure A-2.5.6.2.(2)
                                                                                                     Vent pipe connections




                                                                                                    2-114 Division B                                                                    National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                              A-2.5.6.3.(2)

                                                                                                    A-2.5.6.3.(1)        Vent Connection and Location of Vent Pipes.


                                                                                                                                               vent pipe(1)
                                                                                                                                                                      A


                                                                                                                                                                                                                   B
                                                                                                                                               trap arm/fixture drain

                                                                                                                                               Developed length “A” must be at least twice
                                                                                                                                               the NPS of the trap arm/fixture drain.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                               Fall “B” must not be greater than the
                                                                                                                                               inside diameter of the trap arm/fixture drain.
                                                                                                                                                                                                             EG01165C


                                                                                                     Figure A-2.5.6.3.(1)-A
                                                                                                     Vent connection
                                                                                                     Note to Figure A-2.5.6.3.(1)-A:
                                                                                                     (1) The vent pipe must be connected in accordance with Article 2.5.6.2.


                                                                                                                        max. fall of trap arm equal to its inside diameter
                                                                                                                        min. developed length 2 times the size                             wet vent


                                                                                                                        vent pipe                                                                                  FD
                                                                                                                                                 90°                                Y      45°
                                                                                                                        sanitary T
                                                                                                                                         45°                                                                 45°
                                                                                                                                                                                                       45°



                                                                                                                         Total change in direction: 135°                           Total change in direction: 135°
                                                                                                                                        (a)                                                    (b)             EG02830A


                                                                                                     Figure A-2.5.6.3.(1)-B
                                                                                                     Location of vent pipes that protect fixture traps and maximum change in direction of trap arms


                                                                                                    A-2.5.6.3.(2)        Location of Vent Pipes.


                                                                                                                                                              WC
                                                                                                                                                                                                                    WC
                                                                                                                                                       90°      90°
                                                                                                                          vent pipe
                                                                                                                                                                                wet vent                                  90°

                                                                                                                                                                                            Y     45°
                                                                                                                                                                                                             90°
                                                                                                                                       45°
                                                                                                                          sanitary T


                                                                                                                         Total change in direction: 225°                        Total change in direction: 225°
                                                                                                                                        (a)                                                      (b)
                                                                                                                                                                                                                        EG01166C


                                                                                                     Figure A-2.5.6.3.(2)
                                                                                                     Location of vent pipes and maximum change in direction of trap arms for fixtures that depend on siphonic action


                                                                                                    National Plumbing Code of Canada 2020                                                                                          Division B 2-115
                                                                                                    A-2.5.6.3.(3)                                                                                                                Division B

                                                                                                    A-2.5.6.3.(3)         Length of Water-Closet Fixture Drain.




                                                                                                                                                                                              wet or dry vent



                                                                                                                                            max. 1 m




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                               max. 3 m


                                                                                                                                                                                              stack




                                                                                                                                                       wet or dry vent




                                                                                                                                                                                                                max. 1 m


                                                                                                                                                                  max. 3 m

                                                                                                                                                       stack
                                                                                                                                                                                                         EG01167A


                                                                                                     Figure A-2.5.6.3.(3)
                                                                                                     Length of water-closet fixture drain
                                                                                                     Note to Figure A-2.5.6.3.(3):
                                                                                                     (1) Fall and length of water-closet fixture drain applies to floor-mounted and wall-hung water closets.




                                                                                                    2-116 Division B                                                                                           National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                       A-2.5.6.5.(4)

                                                                                                    A-2.5.6.5.(4) Vent Terminals. No vent pipe other than a fresh air inlet may terminate within the
                                                                                                    limits indicated.


                                                                                                                                                                            vent          3.5 m minimum

                                                                                                                                                         vent
                                                                                                                                                         1 m minimum

                                                                                                                                     1m
                                                                                                                                     minimum
                                                                                                                                                                                          3.5 m minimum




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                         air intake
                                                                                                                                                         3.5 m minimum                    vent
                                                                                                                                     vent
                                                                                                                                     openable window
                                                                                                                                     or door (typical)
                                                                                                                                                                                   vent
                                                                                                                                      vent
                                                                                                                                                                                   150 mm minimum
                                                                                                                                              150 mm                               vent terminal to be
                                                                                                                                              minimum                              high enough to prevent
                                                                                                                                                                                   entry of roof drainage

                                                                                                                                       vent                                    roof sun deck
                                                                                                                                                         2m
                                                                                                                                                         minimum



                                                                                                                                                                               vent




                                                                                                                                                                       1.8 m minimum


                                                                                                                                                                               property line
                                                                                                                                                                                                  EG00664B


                                                                                                     Figure A-2.5.6.5.(4)
                                                                                                     Vent terminals




                                                                                                    National Plumbing Code of Canada 2020                                                                    Division B 2-117
                                                                                                    A-2.5.8.                                                                                                                    Division B

                                                                                                    A-2.5.8. Sizing of Venting Systems. Vent pipes are connected to the drainage system and terminate
                                                                                                    outside the building. They allow air to enter and circulate and they protect the trap seals in the drainage system.
                                                                                                    Except as permitted in Subsection 2.5.1., a trap shall always be protected by a vent pipe.


                                                                                                                                                             S (1 m)                 T (2 m)

                                                                                                                                           R (6 m)                                                                    Y (2 m)
                                                                                                                                                                                      Q (2 m)
                                                                                                                                                                                      P (4 m)
                                                                                                                                                                                                                      X (1 m)
                                                                                                                                                            O (1 m)




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                                  drinking fountain
                                                                                                                                                             N (5 m)

                                                                                                                                                                                  WCs                                 W (3 m)
                                                                                                                                           J (4 m)          M (3 m)


                                                                                                                                           K (1 m)           L (1 m)




                                                                                                                                                                                                                                  lavatory basins
                                                                                                                                           WCs                                                                        V (3 m)
                                                                                                                                                             I (2 m)




                                                                                                               kitchen sinks
                                                                                                                                           H (2 m)                                    G (3 m)
                                                                                                                                                                                           lavatory basin
                                                                                                                                           lavatory basins
                                                                                                                                                                                  WC



                                                                                                                                                            F (2 m)                         bathtub

                                                                                                                                                                                     E (3 m)
                                                                                                                                                                                                                      U (5 m)
                                                                                                                                                                                            drinking fountain


                                                                                                                                                             D (3 m)
                                                                                                                                                C (6 m)
                                                                                                                                                                                     2m
                                                                                                                                                                                             lavatory basin
                                                                                                                                                                     2m



                                                                                                                               cleanout                                                                         cleanout
                                                                                                                                                                                      A (7 m)

                                                                                                                                                                     B (2 m)                                    lavatory basin
                                                                                                                                                                                              WC




                                                                                                                                                                                                                                     EG02043A


                                                                                                     Figure A-2.5.8.
                                                                                                     Sizing of a venting system
                                                                                                     Notes to Figure A-2.5.8.:
                                                                                                     (1) All water closets are 4 fixture units each.
                                                                                                     (2) The letters in columns 1 and 3 of Table A-2.5.8. correspond to the letters in this Figure.




                                                                                                    2-118 Division B                                                                                      National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                                 A-2.5.8.

                                                                                                        Sizing of Vent Pipes
                                                                                                        The nominal pipe sizes stated in Table 2.5.7.1. take precedence over all other venting tables.

                                                                                                        Sizing of Relief Vents
                                                                                                        Length is not taken into consideration when sizing a relief vent and an additional circuit vent. A relief vent
                                                                                                        connected to a circuit-vented branch is sized according to Sentences 2.5.7.3.(1) and (2).
                                                                                                        An offset relief vent is sized according to Sentence 2.5.7.4.(1), which permits the offset relief vent to be
                                                                                                        one NPS smaller than the stack vent.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                    Table A-2.5.8.
                                                                                                                                                              Sizing of Venting Systems

                                                                                                                                                Developed Length Used to         Hydraulic Load Used
                                                                                                                                                                                                                             Minimum Nominal
                                                                                                     Vent Pipe (1)        Vent Name              Determine Nominal Pipe         to Determine Nominal       Code Reference
                                                                                                                                                                                                                                 Pipe Size
                                                                                                                                                        Size, m (1)             Pipe Size, fixture units
                                                                                                          A            Continuous vent                  A + C = 13                         5                  2.5.7.1.             1½
                                                                                                          B               Sump vent                         n/a                           n/a                2.5.7.7.(1)           2
                                                                                                          C              Branch vent                    A + C = 13                         5                 2.5.7.7.(2)           2
                                                                                                                                                                                                              2.5.7.1.
                                                                                                          D               Vent stack           2 + D + F + I + N + S + T = 17             66                                       3
                                                                                                                                                                                                              2.5.7.2.
                                                                                                                        Individual and
                                                                                                          E                                                 n/a                           n/a                 2.5.7.1.             1¼
                                                                                                                       continuous vent
                                                                                                          F               Vent stack                 Same as D = 17                       71                 Same as D             3
                                                                                                                                                                                                             2.5.8.3.(5)
                                                                                                          G            Continuous vent                    G=3                              6                                       1½
                                                                                                                                                                                                              2.5.7.1.
                                                                                                                     Dual and continuous
                                                                                                          H                                                 n/a                           n/a                 2.5.7.1.             1¼
                                                                                                                            vent
                                                                                                           I              Vent stack                 Same as D = 17                       71                 Same as D             3
                                                                                                                                                                                                              2.5.7.1.
                                                                                                          J               Circuit vent                  J+M=7                             40                                       1½
                                                                                                                                                                                                             2.5.8.3.(4)
                                                                                                                                                                                                              2.5.7.1.
                                                                                                          K          Additional circuit vent                n/a                           n/a                                      1½
                                                                                                                                                                                                             2.5.7.3.(1)
                                                                                                                                                                                                              2.5.7.1.
                                                                                                          L               Relief vent                       n/a                           n/a                                      1½
                                                                                                                                                                                                             2.5.7.3.(1)
                                                                                                                                                                                                              2.5.7.1.
                                                                                                          M              Branch vent                    J+M=7                             40                                       1½
                                                                                                                                                                                                              2.5.7.2.
                                                                                                          N               Vent stack                 Same as D = 17                       71                 Same as D             3
                                                                                                                                                                                                              2.5.7.1.
                                                                                                          O               Stack vent                  O+Q+T=5                             66                                       2
                                                                                                                                                                                                              2.5.8.4.
                                                                                                                                                                                                              2.5.7.1.
                                                                                                          P               Circuit vent                    P=4                             16                                       1½
                                                                                                                                                                                                             2.5.8.3.(4)
                                                                                                                                                                                                              2.5.7.1.
                                                                                                          Q               Stack vent                  Same as O = 5                       66                                       2
                                                                                                                                                                                                              2.5.8.4.
                                                                                                          R               Stack vent                  R+S+T=9                             7.5               2.5.2.1.(1)(a)         3
                                                                                                          S              Vent header           A + C + F + I + N + S + T = 25            78.5                2.5.8.3.(3)           3
                                                                                                          T              Vent header                 Same as S = 25                      78.5                2.5.8.3.(3)           3
                                                                                                          U             Individual vent                     n/a                           n/a                 2.5.7.1.             1¼
                                                                                                                                                                                                              2.5.7.1.
                                                                                                          V              Branch vent                 U + V + W = 11                        2                                       1¼
                                                                                                                                                                                                              2.5.7.2.
                                                                                                                                                                                                              2.5.7.1.
                                                                                                          W              Branch vent                 Same as V = 11                        3                                       1¼
                                                                                                                                                                                                              2.5.7.2.
                                                                                                                                                                                                              2.5.7.1.
                                                                                                          X               Stack vent                    X+Y=3                              4                                       1¼
                                                                                                                                                                                                              2.5.8.4.
                                                                                                                                                                                                              2.5.7.1.
                                                                                                          Y               Stack vent                  Same as X = 3                        4                                       1¼
                                                                                                                                                                                                              2.5.8.4.


                                                                                                    National Plumbing Code of Canada 2020                                                                                    Division B 2-119
                                                                                                    A-2.5.8.1.(2)                                                                                                                       Division B

                                                                                                                                                                   Table A-2.5.8. (Continued)

                                                                                                    Notes to Table A-2.5.8.:
                                                                                                    (1)    The letters in columns 1 and 3 correspond to the letters in Figure A-2.5.8.


                                                                                                    A-2.5.8.1.(2)             Sizing of Wet Vent Systems.



                                                                                                                                                 stack vent                    stack vent




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                 wet vent                      wet vent
                                                                                                                                                 portion                       portion




                                                                                                                                                      (1)
                                                                                                                                                                                    (1)
                                                                                                                                                 stack                                                 stack may serve
                                                                                                                                                                                                       1 or 2 water closets

                                                                                                                                        (a)                                                  (b)
                                                                                                                                      Not serving water closets                            Serving water closets
                                                                                                                                                                                                                       EG01171B


                                                                                                          Figure A-2.5.8.1.(2)
                                                                                                          Sizing of wet vent systems
                                                                                                          Note to Figure A-2.5.8.1.(2):
                                                                                                          (1) These two fixtures are not included when determining the nominal pipe size of the wet vent portion using Table 2.5.8.1.




                                                                                                    2-120 Division B                                                                                           National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                       A-2.5.8.3. and 2.5.8.4.

                                                                                                    A-2.5.8.3. and 2.5.8.4.              Lengths to be Considered When Sizing Vent Pipes.



                                                                                                                                                                                                    continuous
                                                                                                                              stack                                        branch C
                                                                                                                                                                                            1.8 m   vent
                                                                                                                              vent                                         vent
                                                                                                                                                     branch           E              individual
                                                                                                                                                                               2.1 m                1.2 m
                                                                                                                                                     vent                            and
                                                                                                                                branch                                  dual and     continuous
                                                                                                                                             G                          continuous                B
                                                                                                                                vent                  2.0 m                          vent
                                                                                                                                                                        vent       D
                                                                                                                          H          0.6 m




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                        F
                                                                                                                                                         2.7 m
                                                                                                                              vent




                                                                                                                                                                                           dual
                                                                                                                                                                                           vent
                                                                                                                                                                                           2.4 m
                                                                                                                                                                                            A


                                                                                                                                                                                                                       EG01172B


                                                                                                     Figure A-2.5.8.3. and 2.5.8.4.-A
                                                                                                     Lengths to be considered when sizing branch, continuous, dual and individual vent pipes
                                                                                                     Notes to Figure A-2.5.8.3. and 2.5.8.4.-A:
                                                                                                     (1) The length of the vent pipe does not apply when sizing vent pipes A-G, D-C and F-E. See Article 2.5.8.2.
                                                                                                     (2) The vent pipe length to be considered when sizing vent pipes B-C, C-E, E-G and G-H is based on the length of BCEGH (i.e., 1.2 + 1.8 + 2.1 +
                                                                                                         2.0 + 0.6 = 7.7 m). See Article 2.5.8.3.




                                                                                                    National Plumbing Code of Canada 2020                                                                                          Division B 2-121
                                                                                                    A-2.6.1.3.(5)                                                                                                              Division B

                                                                                                                                             L           vent header
                                                                                                                    roof
                                                                                                                     branch vent           K         I                              G E                          branch vent
                                                                                                                                                         stack vent
                                                                                                                                           J                                          F
                                                                                                                                                                                                   D
                                                                                                                     branch                              branch

                                                                                                                    branch vent                          branch vent                                            branch vent
                                                                                                                                                                                                                branch




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                                          C




                                                                                                                                                 H                                B                    A



                                                                                                                                                         building drain or branch                                            EG01173B



                                                                                                     Figure A-2.5.8.3. and 2.5.8.4.-B
                                                                                                     Lengths to be considered when sizing stack vent, vent stack and vent header pipes
                                                                                                     Notes to Figure A-2.5.8.3. and 2.5.8.4.-B:
                                                                                                     (1) The vent pipe lengths to be considered when sizing the vent stacks and stack vents are as follows:
                                                                                                            vent stack A-C: ACEGIKL
                                                                                                            vent stack B-C: BCEGIKL
                                                                                                            vent stack H-I: HIKL
                                                                                                            stack vent D-E: DEGIKL
                                                                                                            stack vent F-G: FGIKL
                                                                                                            stack vent J-K: JKL
                                                                                                         See Sentence 2.5.8.4.(2).
                                                                                                     (2) The vent pipe length to be considered when sizing the vent header pipe CEGIKL, or any section of it, is the length of ACEGIKL. See
                                                                                                         Sentence 2.5.8.3.(3).


                                                                                                    A-2.6.1.3.(5) Shut-off Valves. Where multiple risers convey the water supply to dwelling units,
                                                                                                    each dwelling unit's water distribution system shall be provided with a shut-off valve located immediately
                                                                                                    where the water piping enters the suite so as to isolate the fixtures as well as the water distribution piping
                                                                                                    serving the dwelling unit's fixtures. Fixture stopcocks or shut-off valves located immediately adjacent to
                                                                                                    a fixture may not be adequate to protect the water distribution piping. Where a dwelling unit is served by a
                                                                                                    single shut-off valve on the water supply, additional shut-off valves may be required to achieve compliance
                                                                                                    with Sentences 2.6.1.3.(4) and (7).

                                                                                                    A-2.6.1.6.(5) Flush-Tank-Type Urinals in Seasonal Buildings. Flush-tank-type urinals that are
                                                                                                    not in use for an extended period of time, such as those in seasonal buildings, are permitted to be set up to
                                                                                                    flush automatically at predetermined intervals. Automatic flushing prevents the depletion of the water seal
                                                                                                    due to evaporation or backflow conditions. The trap seal restricts the infiltration of gases, which can pose
                                                                                                    health and safety concerns.

                                                                                                    A-2.6.1.7.(5) Relief Valves. If the discharge piping is longer than 2 m or more than two 90° elbows are
                                                                                                    used, the valve manufacturer's installation instructions should be followed to ensure that the piping does not
                                                                                                    affect the relief valves' discharge capacity.




                                                                                                    2-122 Division B                                                                                    National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                               A-2.6.2.4.(2)

                                                                                                    A-2.6.1.9.(1) Water Hammer Prevention. Water hammer is a buildup of pressure in a length of
                                                                                                    horizontal or vertical pipe that occurs when a valve or faucet is closed suddenly. The longer the pipe and the
                                                                                                    greater the water velocity, the greater the pressure exerted on the pipe, which can be many times the normal
                                                                                                    static water pressure and be sufficient to damage the piping system. Since air chambers made from a piece of
                                                                                                    vertical pipe do not provide acceptable protection, pre-manufactured water hammer arresters are required
                                                                                                    to address this potential problem. Water hammer arresters need not be installed at every valve or faucet, nor
                                                                                                    in every piping system.

                                                                                                    A-2.6.1.11.(1) Thermal Expansion. To accommodate the increase in pressure caused by thermal
                                                                                                    expansion within a closed water distribution system, one of the following should be installed:
                                                                                                     (1) a suitably sized diaphragm expansion tank designed for use within a potable water system,




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                     (2) an auxiliary thermal expansion relief valve (T.E.R. valve) conforming to CSA B125.3, “Plumbing fittings,”
                                                                                                         set at a pressure of 550 kPa or less and designed for repeated use, or
                                                                                                     (3) other means acceptable to the authority having jurisdiction.

                                                                                                    A-2.6.1.12.(1) Service Water Heaters. Storing hot water at temperatures below 60°C in the hot water
                                                                                                    tank or in the delivery system may lead to the growth of legionella bacteria. Contemporary electric water heater
                                                                                                    tanks experience temperature stratification and thus tend to have legionella bacteria in the lower parts of the
                                                                                                    tank. Article 2.6.1.12. specifies a thermostat setting of 60°C, which addresses the concern over the growth of
                                                                                                    legionella bacteria in electric hot water storage tanks and is enforceable without introducing unnecessary
                                                                                                    complications. The growth of legionella bacteria is not a concern for other types of water heaters with different
                                                                                                    designs that use different fuels.
                                                                                                    Electrically heated water heaters are shipped with the thermostat set at 60°C. Article 2.6.1.12. is included in
                                                                                                    the NPC to formalize this de facto temperature setting as a requirement. The thermostats have graduated
                                                                                                    temperature markings to allow such a setting, which is not the case with gas- or oil-heated water heaters.

                                                                                                    A-2.6.2.4.(2) Backflow from Fire Protection Systems. The following document is considered to be
                                                                                                    good engineering practice when selecting a backflow preventer for installation on a fire protection system:
                                                                                                    AWWA M14, “Recommended Practice for Backflow Prevention and Cross-Connection Control.”

                                                                                                                                                             Table A-2.6.2.4.(2)
                                                                                                                          Selection Guide for Backflow Prevention Devices on Fire Sprinkler and Standpipe Systems

                                                                                                                                                              Systems Made with Potable Water                 Systems Not Made with Potable Water
                                                                                                                                                                    System Materials (2)                              System Materials (2)
                                                                                                          CSA Standard                                                                                                             Severe Hazard —
                                                                                                                                  Type of Device (1)        Minor Hazard —                                 Moderate Hazard —     Any Class of System
                                                                                                            Number                                                               Minor Hazard — Class
                                                                                                                                                           Residential Partial                              Class 1, 2, 3 and     in which Antifreeze
                                                                                                                                                                                       1 System
                                                                                                                                                         Flow-Through System                                   6 Systems           or Other Additives
                                                                                                                                                                                                                                       Are Used
                                                                                                     CSA B64.6.1                        DuCF                       P                       NP                       NP                   NP
                                                                                                     CSA B64.9                         SCVAF                       P                        P                       NP                   NP
                                                                                                     CSA B64.5.1                       DCVAF                       P                        P                       P                    NP
                                                                                                     CSA B64.4.1                        RPF                        P                        P                       P                     P

                                                                                                    Notes to Table A-2.6.2.4.(2):
                                                                                                    (1)   The “F” indicates that the product is only recommended for use on fire sprinkler and standpipe systems.
                                                                                                    (2)   NP = not permitted and P = permitted.




                                                                                                    National Plumbing Code of Canada 2020                                                                                           Division B 2-123
                                                                                                    A-2.6.2.4.(3)                                                                                                 Division B

                                                                                                    A-2.6.2.4.(3)      Fire Department Pumper Connection and Backflow Protection.


                                                                                                                                                                              fire sprinkler/standpipe riser


                                                                                                                                                                              alarm check
                                                                                                                                                                              or flow switch
                                                                                                                                      fire department
                                                                                                                                      pumper connection
                                                                                                                                                                              shut-off valve




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                               double check-valve assembly
                                                                                                                                                                               with indicating-type control valves



                                                                                                                                                                               shut-off valve

                                                                                                                   municipal water    fire service pipe
                                                                                                                   supply



                                                                                                                   Example of a Class 1 fire sprinkler/standpipe system constructed of
                                                                                                                   non-potable water system materials with no antifreeze or other additives
                                                                                                                                                                                                               EG02007A


                                                                                                     Figure A-2.6.2.4.(3)
                                                                                                     Fire department pumper connection and backflow protection


                                                                                                    A-2.6.2.6.(1) Locations Requiring Premise Isolation. The following list is a guide to locations
                                                                                                    where premise isolation may be required:
                                                                                                      • hospital buildings with operating, mortuary or laboratory facilities
                                                                                                      • radioactive material processing plants
                                                                                                      • petroleum processing facilities
                                                                                                      • premises where inspection is restricted
                                                                                                      • sewage treatment plants
                                                                                                      • commercial laundries (excluding laundromats)
                                                                                                      • plating or chemical plants
                                                                                                      • docks and dockside facilities
                                                                                                      • food and beverage processing plants
                                                                                                      • steam plants
                                                                                                      • trackside facilities for trains
                                                                                                    An assessment of the hazard must be carried out to determine the need, if any, for a backflow prevention device.

                                                                                                    A-2.6.2.9.(2)      Installation of Air Gaps.


                                                                                                                                     control valve
                                                                                                                                     air gap
                                                                                                                                     flood level rim                              water supply



                                                                                                                                                                                         EG01176A


                                                                                                     Figure A-2.6.2.9.(2)
                                                                                                     Installation of air gaps


                                                                                                    2-124 Division B                                                                      National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                         A-2.6.3.1.(2)

                                                                                                    A-2.6.2.10.(2)        Installation of Atmospheric Vacuum Breakers.


                                                                                                                              height of atmospheric                 control valve
                                                                                                                              vacuum breaker

                                                                                                                              flood level rim
                                                                                                                                                                    outlet of atmospheric vacuum
                                                                                                                                                                    breaker (critical level, unless
                                                                                                                                                                    marked otherwise by the
                                                                                                                                                                    manufacturer)
                                                                                                                              overflow




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                              indirect                tank
                                                                                                                              connection(1)
                                                                                                                              outlet                                                        EG01177A


                                                                                                     Figure A-2.6.2.10.(2)
                                                                                                     Installation of atmospheric vacuum breakers
                                                                                                     Note to Figure A-2.6.2.10.(2):
                                                                                                     (1) See Sentence 2.3.3.11.(1).



                                                                                                    A-2.6.3. Water Systems. Subsection 2.6.3. contains performance requirements for water systems. Two
                                                                                                    widely used references for the design of water systems are:
                                                                                                      NIST Building Materials and Structures Report BMS 79, “Water-Distributing Systems for Buildings,” United
                                                                                                        States Department of Commerce, National Bureau of Standards, Washington, D.C., and
                                                                                                      McGraw-Hill 2009, “International Plumbing Codes Handbook,” edited by V.T. Manas, McGraw-Hill Book
                                                                                                        Company, New York, U.S.A.

                                                                                                    A-2.6.3.1. Water Quality. Water destined for use as potable water can originate from a variety of sources
                                                                                                    that are generally classified as surface waters or well waters, such as lakes, rivers, streams and aquifers. In
                                                                                                    some localities, there may be seasonal variations in the water supply, and surface and well waters may be
                                                                                                    blended at times.
                                                                                                    Water composition is the primary consideration in determining the cause of corrosion in potable water systems.
                                                                                                    If the water has corrosive characteristics, water treatment may be necessary to control its corrosiveness: this
                                                                                                    may be as straightforward as adjusting the pH of the water at the treatment plant, or it may involve more
                                                                                                    extensive corrosion-control treatment methods. Water purveyors normally consult treatment specialists to
                                                                                                    develop methods suitable for specific conditions. The treatment of water from private wells may also require
                                                                                                    expert consultation.
                                                                                                    The past performance of plumbing materials and products in different localities often provides insight into
                                                                                                    what can be expected with new installations. In areas where water-related corrosion is known to occur,
                                                                                                    adjustment of water chemistry may be sufficient or it may be necessary to select alternative piping and fitting
                                                                                                    materials or more robust products.
                                                                                                    It is important to note that not all corrosion can be attributed to water conditions: the improper design and
                                                                                                    installation of potable water systems may result in erosion corrosion, galvanic corrosion, fatigue cracking,
                                                                                                    and so forth.

                                                                                                    A-2.6.3.1.(2) Potable Water Systems. The design procedures contained in the following documents
                                                                                                    are considered good engineering practice in the field of potable water systems:
                                                                                                     (a) ASHRAE 2011, “ASHRAE Handbook – HVAC Applications,” chapter on Service Water Heating,
                                                                                                     (b) ASHRAE 2013, “ASHRAE Handbook – Fundamentals,” chapter on Pipe Sizing,
                                                                                                     (c) ASPE 2010, “Plumbing Engineering Design Handbook, Volume 2,”chapter on Cold Water Systems, and
                                                                                                     (d) ASPE 2010, “Plumbing Engineering Design Handbook, Volume 2,” chapter on Domestic Water Heating
                                                                                                          Systems.
                                                                                                    Alternatively, the following methods, which apply to both public and private water supplies, may be used in
                                                                                                    determining the size of each section of the water system using Table A-2.6.3.1.(2)-A (Small Building Method)
                                                                                                    and Table A-2.6.3.1.(2)-F (Average Pressure Loss Method). Where these methods are considered an alternative


                                                                                                    National Plumbing Code of Canada 2020                                                                 Division B 2-125
                                                                                                    A-2.6.3.1.(2)                                                                                       Division B

                                                                                                    to a detailed engineering design method, the hydraulic loads shall be the sum of the total fixture units given in
                                                                                                    Tables 2.6.3.2.-A, 2.6.3.2.-B, 2.6.3.2.-C and 2.6.3.2.-D.

                                                                                                        Small Building Method
                                                                                                        Information required if using this method:
                                                                                                          (a) The developed length:
                                                                                                                (i) from the property line or private water supply system when located outside the building to the
                                                                                                                    water service entry point to the building, and
                                                                                                               (ii) from the water service entry point to the building to the most remote water outlet.
                                                                                                         (b) Minimum static pressure:
                                                                                                                (i) the minimum static pressure available at the property line or other water source (private water




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                    supply system), or
                                                                                                               (ii) where there is a wide fluctuation of pressure in the main throughout the day, the minimum
                                                                                                                    static pressure available.
                                                                                                          (c) Pressure losses:
                                                                                                                (i) losses for meters, pressure-reducing valves, backflow preventers, water treatment systems,
                                                                                                                    and any other devices, and
                                                                                                               (ii) losses or gains due to changes in elevation.
                                                                                                         (d) The number of fixture units (FU) as determined by using the sum of the total values given in
                                                                                                              Tables 2.6.3.2.-A, 2.6.3.2.-B, 2.6.3.2.-C and 2.6.3.2.-D.
                                                                                                          (e) The maximum velocities permitted in accordance with the manufacturer's recommendations for
                                                                                                              the pipe and fittings chosen for the installation.
                                                                                                        Note that a private water supply system must be capable of meeting the demands of the water distribution
                                                                                                        system.

                                                                                                            Pipe Sizing Procedures (see Figure A-2.6.3.1.(2)-A)
                                                                                                            Step 1: Water Service Piping (see Table A-2.6.3.1.(2)-B)
                                                                                                             (a) Obtain the total fixture units required for the installation using the sum of the total
                                                                                                                  values given in Tables 2.6.3.2.-A, 2.6.3.2.-B, 2.6.3.2.-C and 2.6.3.2.-D and consider all
                                                                                                                  other demands on the water supply.
                                                                                                             (b) Determine the minimum static pressure available at the property line or private water
                                                                                                                  supply system and consider all pressure losses for the water service.
                                                                                                              (c) Select the pressure range group in Table A-2.6.3.1.(2)-A that is consistent with the
                                                                                                                  minimum static pressure available including any other losses.
                                                                                                             (d) Select the length column in Table A-2.6.3.1.(2)-A that is equal to or greater than the
                                                                                                                  developed length from the property line or private water supply system to the water
                                                                                                                  service entry point to the building.
                                                                                                             (e) In that column, find the fixture unit value that is equal to or greater than the fixture unit
                                                                                                                  demand for the installation and follow the row back to the first column to locate the
                                                                                                                  nominal pipe size of the water service pipe.
                                                                                                              (f) To establish the adjusted static pressure available where the water service enters the
                                                                                                                  building for sizing the water distribution system, subtract the actual static pressure losses
                                                                                                                  for the water service from the minimum static pressure available at the property line.
                                                                                                             (g) The adjusted static pressure available where a private water supply system is installed
                                                                                                                  should be the static pressure available from such a system at the entry to the building.
                                                                                                            Step 2: Hot Water Piping (see Table A-2.6.3.1.(2)-C)
                                                                                                             (a) Start with the most remote outlet in the most distant occupancy that requires hot water.
                                                                                                             (b) Use the sum of the total fixture unit values given in Tables 2.6.3.2.-A, 2.6.3.2.-B, 2.6.3.2.-C
                                                                                                                  and 2.6.3.2.-D and work back toward the service water heater, adding in the fixture
                                                                                                                  unit values as they occur.
                                                                                                              (c) Select the pressure range group in Table A-2.6.3.1.(2)-A that is consistent with the
                                                                                                                  minimum static pressure available at the water service entry and any other losses (e.g.
                                                                                                                  elevation or devices such as backflow preventers, etc.). Use this pressure range group for
                                                                                                                  all portions (hot and cold) of the water distribution system.
                                                                                                             (d) Select the length column that is equal to or greater than the developed length from the
                                                                                                                  water service entry point to the building to the most remote outlet served with either
                                                                                                                  hot or cold water.




                                                                                                    2-126 Division B                                                                 National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                     A-2.6.3.1.(2)

                                                                                                                 (e) In that column, find the fixture unit value that is equal to or greater than the fixture
                                                                                                                     unit demand at each pipe and follow the row back to the second column to locate the
                                                                                                                     nominal pipe size of the water distribution system.
                                                                                                             Step 3: Cold Water Piping (see Table A-2.6.3.1.(2)-D)
                                                                                                              (a) Start with the most remote outlet on the cold water piping using the established total
                                                                                                                   developed length column and pressure range group in Table A-2.6.3.1.(2)-A and work
                                                                                                                   through Steps 2(c), (d) and (e) for hot water piping.
                                                                                                              (b) Use the sum of the total fixture unit values given in Tables 2.6.3.2.-A, 2.6.3.2.-B, 2.6.3.2.-C
                                                                                                                   and 2.6.3.2.-D and work back toward the water service entry.
                                                                                                              (c) Where the service water heater distribution pipe occurs, add in the fixture unit demand
                                                                                                                   of the fixtures served only with hot water and those that have not yet been added in




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                   as served to the cold water side of the most remote fixtures requiring both a hot and
                                                                                                                   cold water supply.
                                                                                                              (d) Continue by sizing the cold water main between the service water heater distribution
                                                                                                                   pipe and the water service entry.
                                                                                                              (e) Add in the fixtures served with cold water only from the main within the most remote
                                                                                                                   occupancy as they occur and all common distribution piping serving hot and cold water
                                                                                                                   to other occupancies as they occur.
                                                                                                               (f) Complete by sizing all distribution piping served by the main within the most remote
                                                                                                                   occupancy and then the other occupancies not yet sized using the previously established
                                                                                                                   total developed length and pressure range group in Table A-2.6.3.1.(2)-A.

                                                                                                                                                      Table A-2.6.3.1.(2)-A
                                                                                                         Nominal Pipe Sizes for Water Systems Based on Number of Fixture Units Served Using the Small Building Method (1)

                                                                                                                                                                      Maximum Allowable Length, m
                                                                                                                  Water Dis-
                                                                                                       Water                   12    18    24    30    46        61        76     91    122    152      183   213    244      274   305
                                                                                                                   tribution
                                                                                                      Service
                                                                                                                   System,                                        Number of Fixture Units Served
                                                                                                     Pipe, NPS
                                                                                                                      NPS
                                                                                                                                                            Flow Velocity, m/s    3.0    2.4    1.5
                                                                                                    Pressure Range 200 to 310 kPa
                                                                                                        ¾             ½         6     5     4     3     2         1        1      1      0          0    0     0      0        0     0
                                                                                                        ¾             /8
                                                                                                                      5
                                                                                                                               12    10     9     7     5         3        3      3      2          2    1     1      1        1     0
                                                                                                        ¾             ¾        18    16    14    12     9         6        5      5      4          4    3     2      2        2     1
                                                                                                        1             1        36    31    27    25    20        17        15     13     12     10       8     6      6        6     6
                                                                                                        1½           1¼        83    68    57    48    38        32        28     25     21     18      15    12     12       11     11
                                                                                                        1½           1½        151   124   105   91    70        57        49     45     36     31      26    23     21       20     20
                                                                                                        2            1½        151   151   132   110   80        64        53     46     38     32      27    23     21       20     20
                                                                                                        2             2        359   329   292   265   217       185      164    147    124     96      70    61     57       54     51
                                                                                                        2½           2½        445   418   390   370   330       300      280    265    240    220      198   175    158      143   133
                                                                                                    Pressure Range 311 to 413 kPa
                                                                                                        ¾             ½         8     7     6     5     4         3        2      2      1          1    1     0      0        0     0
                                                                                                        ¾             /8
                                                                                                                      5
                                                                                                                               13    13    12    11     9         7        5      5      3          3    2     2      1        1     1
                                                                                                        ¾             ¾        21    21    19    17    14        11        9      8      6          5    4     4      3        3     3
                                                                                                        1             1        42    42    41    36    30        25        23     20     18     15      12    10      9        8     8
                                                                                                        1½           1¼        83    83    83    83    66        52        44     39     33     29      24    20     19       17     16
                                                                                                        1½           1½        151   151   151   151   128       105       90     78     62     52      42    38     35       32     30
                                                                                                        2            1½        151   151   151   151   150       117       98     84     67     55      42    38     35       32     30
                                                                                                        2             2        359   359   359   359   359       318      280    250    205    165      142   123    110      102    94
                                                                                                        2½           2½        611   611   610   580   535       500      470    440    400    365      335   315    285      267   250




                                                                                                    National Plumbing Code of Canada 2020                                                                                 Division B 2-127
                                                                                                    A-2.6.3.1.(2)                                                                                                                            Division B

                                                                                                                                                             Table A-2.6.3.1.(2)-A (Continued)

                                                                                                                                                                                     Maximum Allowable Length, m
                                                                                                                    Water Dis-
                                                                                                        Water                      12      18      24       30        46        61        76     91    122     152       183     213         244   274     305
                                                                                                                     tribution
                                                                                                       Service
                                                                                                                     System,                                                     Number of Fixture Units Served
                                                                                                      Pipe, NPS
                                                                                                                        NPS
                                                                                                                                                                           Flow Velocity, m/s    3.0    2.4    1.5
                                                                                                     Pressure Over 413 kPa
                                                                                                           ¾            ½           8       8       7       6         5          4         3     3      2          1      1         1         1     1       0
                                                                                                           ¾            5
                                                                                                                         /8        13      13      13       13        11         8         7     6      5          4      3         3         3     2       2




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                           ¾            ¾          21      21      21       21        17        13        11     10     8          7      6         6         5     4       4
                                                                                                           1             1         42      42      42       42        38        32        29     26     22      18        14     13          12     12     11
                                                                                                          1½            1¼         83      83      83       83        83        74        62     54     43      34        26     25          23     22     21
                                                                                                          1½            1½        151     151      151     151       151        151       130   113     88      73        51     51          46     43     40
                                                                                                           2            1½        151     151      151     151       151        151       142   122     98      82        64     51          46     43     40
                                                                                                           2             2        359     359      359     359       359        359       359   340    288     245       204     172         153   141     129
                                                                                                          2½            2½        611     611      611     611       611        611       610   570    510     460       430     404         380   356     329

                                                                                                    Notes to Table A-2.6.3.1.(2)-A:
                                                                                                    (1)   Where total fixture unit values exceed those given in this Table, the system must be designed according to a detailed engineering design method.


                                                                                                                                                             Table A-2.6.3.1.(2)-B
                                                                                                                              Sizing of Water Service Pipe Using Figure A-2.6.3.1.(2)-A and Table A-2.6.3.1.(2)-A (1)

                                                                                                                                                                Fixture Units                                                                Nominal Pipe Size
                                                                                                     Total demand from Table A-2.6.3.1.(2)-E                                                                           210.8                        –
                                                                                                     Add in fixture units for fire sprinkler system, irrigation system and any other demands on                                                     –
                                                                                                                                                                                                              n/a in this example
                                                                                                     water service
                                                                                                                                                                       Total demand in this example                    210.8                        2

                                                                                                    Notes to Table A-2.6.3.1.(2)-B:
                                                                                                    (1)   Based on 30 m developed length and minimum static pressure at property line of 565 kPa.


                                                                                                                                                          Table A-2.6.3.1.(2)-C
                                                                                                                   Sizing of Hot Water System Using Figure A-2.6.3.1.(2)-A and Table A-2.6.3.1.(2)-A with Pressure Drop (1)

                                                                                                                       Pipe Number                                    Hot Water, fixture units                             Nominal Pipe Size, NPS
                                                                                                                            1                                                   8                                                    ¾
                                                                                                                            2                                                  11                                                    ¾
                                                                                                                            3                                                  15                                                     1
                                                                                                                              4                                                       6                                                 /8
                                                                                                                                                                                                                                        5


                                                                                                                              5                                                      21                                                 1
                                                                                                                                   Total Fixture Units                               21                                                 1

                                                                                                    Notes to Table A-2.6.3.1.(2)-C:
                                                                                                    (1)   Based on 76 m developed length and adjusted static pressure at building entry of 540 kPa.




                                                                                                    2-128 Division B                                                                                            National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                         A-2.6.3.1.(2)

                                                                                                                                                            Table A-2.6.3.1.(2)-D
                                                                                                                              Sizing of Cold Water System Using Figure A-2.6.3.1.(2)-A and Table A-2.6.3.1.(2)-A (1)

                                                                                                                        Pipe Letter                               Cold Water, fixture units                   Nominal Pipe Size, NPS
                                                                                                                             A                                             11                                           ¾
                                                                                                                             B                                             21                                           1
                                                                                                                             C                                             21                                           1
                                                                                                                             D                                             29.8                                        1¼
                                                                                                                             E                                             20                                           1
                                                                                                                             F                                             49.8                                        1¼




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                             G                                             20                                           1
                                                                                                                             H                                             69.8                                        1½
                                                                                                                             I                                             20                                           1
                                                                                                                             J                                             89.8                                        1½
                                                                                                                             K                                             20                                           1
                                                                                                                             L                                            109.8                                        1½
                                                                                                                             M                                             60                                          1¼
                                                                                                                             N                                            169.8                                         2
                                                                                                                             O                                             20                                           1
                                                                                                                             P                                            189.8                                         2
                                                                                                                             Q                                             21                                           1
                                                                                                                             R                                            210.8                                         2
                                                                                                                                   Total Fixture Units                    210.8                                         2

                                                                                                    Notes to Table A-2.6.3.1.(2)-D:
                                                                                                    (1)   Based on 76 m developed length and minimum adjusted static pressure at building entry of 540 kPa.




                                                                                                    National Plumbing Code of Canada 2020                                                                                     Division B 2-129
                                                                                                    A-2.6.3.1.(2)                                                                                                               Division B


                                                                                                                                                                            Residential     (E)
                                                                                                                                                                              20 FU         20 FU


                                                                                                                                                                          (G)
                                                                                                                                                                          20 FU
                                                                                                                                                                                                                              (D)
                                                                                                                                                                               Pipe D = 29.8 FU (F)
                                                                                                                                                                               Pipe E + 20.0 FU                              Pipe C = 21.0 FU
                                                                                                                                                                                 Total = 49.8 FU                             4 WC + 8.8 FU
                                                                                                                                          Residential                                                                          Total = 29.8 FU
                                                                                                                                                           (I)
                                                                                                                                            20 FU




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                           20 FU                        Pipe B = 21.0 FU
                                                                                                                                                                                        No additions
                                                                                                                                    (K)                                                   Total = 21.0 FU       4 WC
                                                                                                                                    20 FU                                      (H)                    (C)       6 L each
                                                                                                                                                                       Pipe F = 49.8 FU                         2.2 FU each
                                                                                                                                                                       Pipe G + 20.0 FU
                                                                                                          Residential                                                     Total = 69.8 FU                        (B)
                                                                                                            20 FU        Pipe J = 89.8 FU                       (J)                          3 Lavatories       Pipe A = 11.0 FU
                                                                                                                                                               Pipe H = 69.8 FU               2 FU each
                                                                                                                         Pipe K + 20.0 FU (L)                                                                   Hot      + 10.0 FU
                                                                                                                           Total = 109.8 FU                    Pipe I + 20.0 FU                                     Total = 21.0 FU
                                                                                                                  (O)                                     (M)     Total = 89.8 FU               21 FU
                                                                                                                  20 FU                                  60 FU                       (4)         (5)             (A) 11 FU
                                                                                                                              (P)             (N)                                   6 FU
                                                                                                                                                                                                                 2 Commercial sinks
                                                                                                           Pipe N = 169.8 FU                  Pipe L = 109.8 FU         Commercial
                                                                                                                                                                                                     SWH         4 FU each (1)
                                                                                                           Pipe O + 20.0 FU                   Pipe M + 60.0 FU          16 FU
                                                                                                                                                Total = 169.8 FU                                       Service sink           8 FU
                                                                                                              Total = 189.8 FU
                                                                                                                                                                                                          3 FU
                                                                                                                                          (Q)
                                                                                                                         (R)             21 FU                                                                      (2)
                                                                                                                                                                 Commercial          (3)                          11 FU
                                                                                                           Pipe P = 189.8 FU                                        44 FU          15 FU
                                                                                                           Pipe Q + 21.0 FU
                                                                                                             Total = 210.8 FU
                                                                                                                                                     Commercial                                  Commercial DW = 4 FU
                                                                                                                                                        21 FU                                    (per manufacturer’s data)



                                                                                                               Water meter                Adjusted pressure at
                                                                                                                                          water service entry
                                                                                                                       P/L                540 kPa (78 PSI)
                                                                                                                                           Water service
                                                                                                                                           210.8 FU
                                                                                                               Minimum pressure at                                                                          indicates hot water
                                                                                                               property line                                                                                indicates cold water
                                                                                                               565 kPa (82 PSI)

                                                                                                                                      For use with Small Building and Average Pressure Loss Methods of water pipe sizing
                                                                                                                                                                                                                                            EG00672A


                                                                                                          Figure A-2.6.3.1.(2)-A
                                                                                                          Example of commercial and residential development to be used with water pipe sizing methods
                                                                                                          Notes to Figure A-2.6.3.1.(2)-A:
                                                                                                          (1) This example is a development with 4 commercial occupancies on the lower floor and 5 residential occupancies on the upper floor, all
                                                                                                              with separate service water heaters.
                                                                                                          (2) For the purpose of water pipe sizing:
                                                                                                                   • the minimum adjusted pressure available at building entry is 540 kPa (78 PSI);
                                                                                                                   • the developed length of the water service is 30 m (98 ft); and
                                                                                                                   • the developed length of the water distribution system is 76 m (249 ft).




                                                                                                    2-130 Division B                                                                                     National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                A-2.6.3.1.(2)

                                                                                                                                                        Table A-2.6.3.1.(2)-E
                                                                                                             Fixture Units Summary for Figure A-2.6.3.1.(2)-A Using Tables 2.6.3.2.-A, 2.6.3.2.-B, 2.6.3.2.-C and 2.6.3.2.-D

                                                                                                                                                                                                          Total Demand (Quantity ×
                                                                                                                   Fixtures                     Quantity                 100% Fixture Unit Values
                                                                                                                                                                                                             Fixture Unit Values)
                                                                                                    Lavatory, 8.3 LPM or less                      3                                2                                6
                                                                                                    Commercial sink                                2                                4                                8
                                                                                                    Service sink                                   1                                3                                3
                                                                                                    WC, 6 LPF or less                              4                               2.2                              8.8
                                                                                                    Commercial dishwasher                          1                                4                                4




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    Commercial occupancy                           1                               16                               16
                                                                                                    Commercial occupancy                           1                               44                               44
                                                                                                    Commercial occupancy                           1                               21                               21
                                                                                                    Residential occupancy                          5                               20                               100
                                                                                                                                                                                    Total Fixture Units            210.8


                                                                                                        Average Pressure Loss Method
                                                                                                        Information required if using this method:
                                                                                                          (a) The developed length:
                                                                                                                (i) from the property line or private water system when located outside the building to the water
                                                                                                                    service entry point to the building, and
                                                                                                               (ii) from the building entry of the water service to the most remote water outlet.
                                                                                                         (b) Minimum static pressure:
                                                                                                                (i) the minimum static pressure available at the property line or other water source (private water
                                                                                                                    supply system), or
                                                                                                               (ii) where there is a wide fluctuation of pressure in the main throughout the day, the minimum
                                                                                                                    static pressure available.
                                                                                                          (c) Pressure losses:
                                                                                                                (i) losses for meters, pressure-reducing valves, backflow preventers, water treatment systems,
                                                                                                                    and any other devices, and
                                                                                                               (ii) losses or gains due to changes in elevation.
                                                                                                         (d) The number of fixture units as determined by using the sum of the total values given in
                                                                                                              Tables 2.6.3.2.-A, 2.6.3.2.-B, 2.6.3.2.-C and 2.6.3.2.-D.
                                                                                                          (e) The maximum velocities permitted in accordance with the manufacturer's recommendations for
                                                                                                              the pipe and fittings chosen for the installation.
                                                                                                        Note: The private water supply system must be capable of meeting the demands of the water distribution
                                                                                                        system.
                                                                                                        To use this method, calculate the pressure available for friction loss which must be 2.6 kPa per metre or
                                                                                                        more; if it is less than that, the system must be designed according to a detailed engineering design method.

                                                                                                             Calculating Pressure Available for Friction Loss (see Figure A-2.6.3.1.(2)-B)
                                                                                                               (a) Obtain the water service size, including pressure losses, and the design of the private
                                                                                                                   water supply system if it is separate from the water distribution system.
                                                                                                               (b) To calculate the total equivalent length for the water distribution system, determine
                                                                                                                   the developed length from the water service entry point to the building to the most
                                                                                                                   remote water outlet, and
                                                                                                                     (i) where fitting inside diameter dimensions are at least equal to the NPS, multiply
                                                                                                                         the developed length by 1.5 to allow for friction losses, and
                                                                                                                    (ii) where insert fittings are used, apply additional losses in accordance with the fitting
                                                                                                                         manufacturer's data.
                                                                                                               (c) To determine the adjusted pressure available at the water service entry for sizing the
                                                                                                                   water distribution system, deduct the pressure losses for the water service from the
                                                                                                                   minimum static pressure available at the property line or private water source.



                                                                                                    National Plumbing Code of Canada 2020                                                                            Division B 2-131
                                                                                                    A-2.6.3.1.(2)                                                                                                              Division B

                                                                                                              (d) To obtain the pressure available for friction loss, use the minimum adjusted static
                                                                                                                  pressure available at the water service entry and deduct the minimum operating pressure
                                                                                                                  necessary at the most remote water outlet, and losses for meters, pressure-reducing
                                                                                                                  valves, backflow preventers, water treatment systems, and any other devices. Include
                                                                                                                  pressure losses or gains due to changes in elevation between the water service entry
                                                                                                                  and the most remote water outlet.
                                                                                                              (e) Divide the static pressure available for friction loss by the total equivalent length to
                                                                                                                  obtain the pressure available for friction loss per metre.


                                                                                                               Step 1(c)




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                   565 kPa          –         25 kPa           =         540 kPa

                                                                                                                Minimum static             Pressure losses         Adjusted pressure at water
                                                                                                                pressure                   for service             service entry to the building

                                                                                                               Step 1(d)
                                                                                                                  540 kPa          – (    20 kPa        +       35 kPa        +    105 kPa         ) =         380 kPa

                                                                                                               Adjusted pressure         Meter, PRV,          Losses for          Minimum pressure         Total pressure
                                                                                                                                         BFP and              system height       necessary at the         available for friction loss
                                                                                                                                         other losses                             fixture for              from the water service
                                                                                                                                                                                  operation                entry to the most remote
                                                                                                               Step 1(e)                                                                                   water supply outlet

                                                                                                                  380 kPa           ÷        114 m             =     3.3 kPa per metre

                                                                                                                Total pressure           Developed length            Average pressure
                                                                                                                available for            x 1.5 for fittings          loss must be
                                                                                                                friction loss            and/or additional           minimum
                                                                                                                                         losses if insert            2.6 kPa per metre
                                                                                                                                         fittings are used                                                                  EG00673A


                                                                                                              Figure A-2.6.3.1.(2)-B
                                                                                                              Determination of pressure available for friction loss


                                                                                                            Pipe Sizing Procedures (see Figure A-2.6.3.1.(2)-A)
                                                                                                            Step 1: Water Service Piping (see Table A-2.6.3.1.(2)-G)
                                                                                                             (a) Obtain the total fixture units required for the installation using the sum of the total
                                                                                                                  values given in Tables 2.6.3.2.-A, 2.6.3.2.-B, 2.6.3.2.-C and 2.6.3.2.-D and consider all
                                                                                                                  other demands on the water supply.
                                                                                                             (b) Select the water service pipe size from Table A-2.6.3.1.(2)-F using the velocity column
                                                                                                                  that is consistent with the pipe and fittings chosen for the installation.
                                                                                                              (c) Determine the minimum static pressure available at the property line or private water
                                                                                                                  source and consider all pressure losses for the water service.
                                                                                                             (d) To establish the adjusted static pressure available where the water service enters the
                                                                                                                  building for sizing the water distribution system, subtract the actual static pressure losses
                                                                                                                  for the water service from the minimum static pressure available at the property line.
                                                                                                             (e) The adjusted static pressure available where a private water supply system is installed
                                                                                                                  should be the static pressure available from such a system at the entry to the building.
                                                                                                            Step 2: Hot Water Piping (see Table A-2.6.3.1.(2)-H)
                                                                                                             (a) Start with the most remote outlet in the most distant occupancy that requires hot water.
                                                                                                             (b) Use the sum of the total fixture unit values given in Tables 2.6.3.2.-A, 2.6.3.2.-B, 2.6.3.2.-C
                                                                                                                 and 2.6.3.2.-D and work back toward the service water heater, adding in the fixture
                                                                                                                 unit values as they occur.
                                                                                                             (c) Size the hot water system according to Table A-2.6.3.1.(2)-F using the velocity column
                                                                                                                 that is consistent with the manufacturer's requirements for the pipe and fittings chosen
                                                                                                                 when serving a hot water system.


                                                                                                    2-132 Division B                                                                                     National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                                         A-2.6.3.1.(2)

                                                                                                                       Step 3: Cold Water Piping (see Table A-2.6.3.1.(2)-I)
                                                                                                                        (a) Start with the most remote outlet requiring cold water in the most distant occupancy
                                                                                                                             and working back towards the water service entry adding in the fixture unit values
                                                                                                                             as they occur.
                                                                                                                        (b) Obtain the fixture units using the sum of the total fixture unit values given in
                                                                                                                             Tables 2.6.3.2.-A, 2.6.3.2.-B, 2.6.3.2.-C and 2.6.3.2.-D.
                                                                                                                         (c) Size the cold water system to Table A-2.6.3.1.(2)-F using the velocity column that is
                                                                                                                             consistent with the manufacturer's requirements for the pipe and fittings chosen when
                                                                                                                             serving a cold water system.
                                                                                                                        (d) Where the service water heater distribution pipe occurs, add in the fixture unit demand
                                                                                                                             of the fixtures served with only hot water and those that have not yet been added in
                                                                                                                             as served to the cold water side of the most remote fixtures requiring both hot and




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                             cold water supply.
                                                                                                                        (e) Continue by sizing the cold water main between the service water heater distribution
                                                                                                                             pipe and the water service entry.
                                                                                                                         (f) Add in the fixtures served with only cold water from the main within the most remote
                                                                                                                             occupancy as they occur and then all common distribution piping serving hot and cold
                                                                                                                             water to other occupancies as they occur.
                                                                                                                        (g) Complete by sizing all distribution piping served by the main in the most remote
                                                                                                                             occupancy and then the other occupancies not yet sized using Table A-2.6.3.1.(2)-F.

                                                                                                                                                          Table A-2.6.3.1.(2)-F
                                                                                                          Nominal Pipe Sizes for Water Systems Based on Number of Fixture Units Served Using the Average Pressure Loss Method

                                                                                                                                                                                            Water Velocity
                                                                                                      Nominal Pipe               3.0 m/s (10 ft/s)                   2.4 m/s (8 ft/s)                        1.5 m/s (5 ft/s)             1.2 m/s (4 ft/s)
                                                                                                         Size                                                                Flow and Fixture Units Served
                                                                                                                                L/s        Fixture Units          L/s            Fixture Units           L/s           Fixture Units    L/s         Fixture Units
                                                                                                              ½                0.46              8                0.36                  7               0.23                 3.5       0.18               2.5
                                                                                                              5
                                                                                                                  /8           0.68             13                0.54                11                0.34                 6.5       0.27               4.5
                                                                                                              ¾                0.95             21                0.77                17                0.48                    9      0.38               7.5
                                                                                                              1                1.62             42                1.26                30                0.81                 18        0.65               14
                                                                                                             1¼                2.47             83                1.8                 54                1.24                 29        0.99               22
                                                                                                             1½                 3.5             146               2.8                102                1.75                 46         1.4               34
                                                                                                              2                6.08             337               4.92               265                3.04                120        2.43               81
                                                                                                             2½                9.39             692               7.89               500                4.69                245        3.75              170
                                                                                                              3                13.23           1 018             10.73               750                 6.7                400        5.36              295
                                                                                                              4                23.94           2 480              18.9              1 800               11.78               850        9.42              600
                                                                                                              5                 37             4 400               29               3 350               18.35               1 625      14.68             1 125
                                                                                                              6                52.1            6 600               42               4 800               26.38               2 875      21.11             2 125


                                                                                                                                                                Table A-2.6.3.1.(2)-G
                                                                                                                                 Sizing of Water Service Pipe Using Figure A-2.6.3.1.(2)-A and Table A-2.6.3.1.(2)-F (1)

                                                                                                                                                                 Fixture Units                                                                Nominal Pipe Size
                                                                                                     Total demand from Table A-2.6.3.1.(2)-E                                                                        210.8                            –
                                                                                                     Add in fixture units for fire sprinkler system, irrigation system and any other                                                                 –
                                                                                                                                                                                                             n/a in this example
                                                                                                     demands on water service
                                                                                                                                                           Total demand in this example                             210.8                            2

                                                                                                    Notes to Table A-2.6.3.1.(2)-G:
                                                                                                    (1)    Based on 30 m developed length and minimum static pressure at property line of 565 kPa.




                                                                                                    National Plumbing Code of Canada 2020                                                                                                       Division B 2-133
                                                                                                    A-2.6.3.2.(4)                                                                                                              Division B

                                                                                                                                                           Table A-2.6.3.1.(2)-H
                                                                                                                    Sizing of Hot Water System Using Figure A-2.6.3.1.(2)-A and Table A-2.6.3.1.(2)-F with Flow Velocity (1)

                                                                                                                       Pipe Number                                  Hot Water, fixture units                Nominal Pipe Size, NPS
                                                                                                                              1                                                8                                      ¾
                                                                                                                              2                                                11                                     1
                                                                                                                              3                                                15                                     1
                                                                                                                              4                                                6                                      5
                                                                                                                                                                                                                          /8
                                                                                                                              5                                                21                                    1¼
                                                                                                                                   Total Fixture Units                         21                                    1¼




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    Notes to Table A-2.6.3.1.(2)-H:
                                                                                                    (1)   Based on 1.5 m/s and adjusted static pressure at building entry of 540 kPa.


                                                                                                                                                             Table A-2.6.3.1.(2)-I
                                                                                                                              Sizing of Cold Water System Using Figure A-2.6.3.1.(2)-A and Table A-2.6.3.1.(2)-F (1)

                                                                                                                         Pipe Letter                                Cold Water, fixture units               Nominal Pipe Size, NPS
                                                                                                                             A                                                11                                      5
                                                                                                                                                                                                                          /8
                                                                                                                             B                                                21                                      1
                                                                                                                             C                                                21                                      1
                                                                                                                             D                                                29.8                                    1
                                                                                                                             E                                                20                                      1
                                                                                                                              F                                               49.8                                   1¼
                                                                                                                             G                                                20                                      1
                                                                                                                             H                                                69.8                                   1½
                                                                                                                              I                                               20                                      1
                                                                                                                              J                                               89.8                                   1½
                                                                                                                             K                                                20                                      1
                                                                                                                              L                                             109.8                                     2
                                                                                                                             M                                                60                                     1½
                                                                                                                             N                                              169.8                                     2
                                                                                                                             O                                                20                                      1
                                                                                                                             P                                              189.8                                     2
                                                                                                                             Q                                                21                                      1
                                                                                                                             R                                              210.8                                     2
                                                                                                                                   Total Fixture Units                      210.8                                     2

                                                                                                    Notes to Table A-2.6.3.1.(2)-I:
                                                                                                    (1)   Based on 2.4 m/s velocity and adjusted static pressure at water service entry of 540 kPa.


                                                                                                    A-2.6.3.2.(4) Sizing for Flush Valves. Distribution piping and water mains serving flush valves may
                                                                                                    be sized using the values assigned in Tables 2.6.3.2.-B and 2.6.3.2.-C, beginning with the most remote flush
                                                                                                    valve on each section of distribution piping served by the water main.




                                                                                                    2-134 Division B                                                                                  National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                  A-2.6.3.4.(5)

                                                                                                    A-2.6.3.4.(5) Sizing of Water Systems. Sentence 2.6.3.4.(5) and Table 2.6.3.4. present a simplified
                                                                                                    method of water system sizing, which is permitted in buildings containing one or two dwelling units or
                                                                                                    row houses with separate water services.

                                                                                                        Simplified Method
                                                                                                        This sizing method may be used in the buildings noted, where:
                                                                                                         (a) the total developed length from the property line to the most remote fixture is not more than 90 m, and
                                                                                                         (b) the static pressure available at the water service entry to the building is not less than 200 kPa.
                                                                                                        Where either the developed length is exceeded or the minimum static pressure required is not known, a
                                                                                                        detailed engineering design method must be used to size the water service piping. The design must ensure




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                        a minimum static pressure of 200 kPa is available at the water service entry to the building.
                                                                                                        Information required when using this method:
                                                                                                          (a) The total number of fixture units (FU) as determined by using the sum of the total fixture unit values
                                                                                                              given in Tables 2.6.3.2.-A, 2.6.3.2.-B, 2.6.3.2.-C and 2.6.3.2.-D.
                                                                                                         (b) Where the water service also serves a fire sprinkler system, irrigation system, or any other system,
                                                                                                              these demands must be added to the water service sizing.

                                                                                                            Pipe Sizing Procedures
                                                                                                            Step 1: Water Service Pipe
                                                                                                             (a) Obtain the total fixture units required for the installation using the sum of the total
                                                                                                                 values given in Tables 2.6.3.2.-A, 2.6.3.2.-B, 2.6.3.2.-C and 2.6.3.2.-D and consider all
                                                                                                                 other demands on the water supply.
                                                                                                             (b) Determine the water service pipe size using the water velocity column in Table 2.6.3.4.
                                                                                                                 that is consistent with the pipe material chosen for the installation.
                                                                                                            Step 2: Hot Water Piping
                                                                                                             (a) Start with the most remote fixture requiring a supply of hot water and work back toward
                                                                                                                 the service water heater, adding in the fixture unit loads as they occur.
                                                                                                             (b) Determine the fixture units using the sum of the total fixture unit values given in
                                                                                                                 Tables 2.6.3.2.-A, 2.6.3.2.-B, 2.6.3.2.-C and 2.6.3.2.-D.
                                                                                                             (c) Size the hot water system using the water velocity column in Table 2.6.3.4. that is
                                                                                                                 consistent with the manufacturer's recommendations for the pipe and fittings chosen
                                                                                                                 when serving a hot water system.
                                                                                                            Step 3: Cold Water Piping
                                                                                                             (a) Start with the most remote fixture requiring a supply of cold water and work back
                                                                                                                  toward the water service entry, adding in the fixture unit loads as they occur.
                                                                                                             (b) Obtain the fixture units using the sum of the total fixture unit values given in
                                                                                                                  Tables 2.6.3.2.-A, 2.6.3.2.-B, 2.6.3.2.-C and 2.6.3.2.-D.
                                                                                                              (c) Size the cold water system using the water velocity column in Table 2.6.3.4. that is
                                                                                                                  consistent with the manufacturer's recommendations for the pipe chosen when serving
                                                                                                                  a cold water system.
                                                                                                             (d) Where the service water heater distribution pipe occurs, add in the fixture unit demand
                                                                                                                  of the fixtures served with only hot water and those that have not yet been added in as
                                                                                                                  served to the cold water side of the fixtures requiring both a hot and cold water supply.
                                                                                                             (e) Continue sizing the cold water main between the service water heater distribution
                                                                                                                  pipe and the water service entry by adding all fixtures served with only a cold water
                                                                                                                  supply as they occur.
                                                                                                              (f) Complete by sizing all cold water distribution piping served by the main between the
                                                                                                                  water heater distribution pipe and the water service entry.




                                                                                                    National Plumbing Code of Canada 2020                                                             Division B 2-135
                                                                                                    A-2.6.3.4.(5)                                                                                                                 Division B

                                                                                                                                                                                                                        fixture spout
                                                                                                                                                                                                                        maximum 2.0 FU(1)

                                                                                                                                                                             cold supply
                                                                                                                                                                             2.0 FU(2)




                                                                                                                                         common supply for hot
                                                                                                                                         and cold maximum 2.0 FU(3)
                                                                                                                                                                                                                        hot supply




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                                                                        2.0 FU(2)
                                                                                                                  common supply = 2.0 FU
                                                                                                                     1 hose bibb + 2.5 FU
                                                                                                                                                                                                        service water
                                                                                                                           Total = 4.5 FU
                                                                                                                                                                                                        heater




                                                                                                                     water service entry
                                                                                                                     to the building

                                                                                                                                                                     hose bibb                        indicates hot water
                                                                                                                                                                     2.5 FU                           indicates cold water
                                                                                                                                                                                                                                   EG00671A


                                                                                                          Figure A-2.6.3.4.(5)-A
                                                                                                          Determining the hydraulic needs of a fixture
                                                                                                          Notes to Figure A-2.6.3.4.(5)-A:
                                                                                                          (1) The fixture spout delivers a maximum of 2.0 fixture units.
                                                                                                          (2) This would apply if only the hot side or the cold side were fully opened.
                                                                                                          (3) The common pipe that serves both the hot and cold sides of the faucet also delivers a maximum of 2.0 fixture units even if both the hot
                                                                                                              and cold valves at the faucet are fully opened at the same time.


                                                                                                                                                        Table A-2.6.3.4.(5)-A
                                                                                                              Fixture Units Summary Using Figure A-2.6.3.4.(5)-B and Tables 2.6.3.2.-A, 2.6.3.2.-B, 2.6.3.2.-C and 2.6.3.2.-D

                                                                                                                                                                                                                              Total Demand
                                                                                                                 Fixtures                       Number of Fixtures                 100% Fixture Unit Values
                                                                                                                                                                                                                      (Quantity × Fixture Unit Values)
                                                                                                    Bathtub                                               2                                    1.4                                    2.8
                                                                                                    Clothes washer                                        2                                    1.4                                    2.8
                                                                                                    Dishwasher                                            2                                    1.4                                    2.8
                                                                                                    Hose bibb                                             1                                    2.5                                    2.5
                                                                                                    Lavatory, 8.3 LPM or less                             3                                    0.7                                    2.1
                                                                                                    Shower, 9.5 LPM or less                               1                                    1.4                                    1.4
                                                                                                    Sink, 8.3 LPM or less                                 2                                    1.4                                    2.8
                                                                                                    WC, 6 LPF or less                                     3                                    2.2                                    6.6
                                                                                                                                                                                               Total Fixture Units                   23.8




                                                                                                    2-136 Division B                                                                                      National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                                                         A-2.6.3.4.(5)

                                                                                                                                                                                                                             6.3 FU
                                                                                                                                                                                                                       2
                                                                                                                                                                           3.5 FU
                                                                                                                                                                                      1               DW
                                                                                                                                                                                                      KS         SHWR        LAV

                                                                                                                                                                                          LAV              (A)
                                                                                                                                                                               BT                                            WC
                                                                                                                                                                                                      2.8 FU

                                                                                                                          Include load on Pipe D = 11.4 FU CW
                                                                                                                     Add fixtures on Pipe 5 (hot)
                                                                                                                                                                                                      5.7 FU
                                                                                                                                served by Pipe F + 6.3 FU                                       (C)
                                                                                                                            Add 1 DW on Pipe 3                WC




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                                                                           (B)
                                                                                                                                served by Pipe F  +  1.4 FU
                                                                                                                       (Note: Fixtures on Pipe 3                                                                            5.7 FU
                                                                                                                                                                                     11.4 FU
                                                                                                                       already served by Pipe F                                                   (D)
                                                                                                                   on cold side not added again)                                                                                      3
                                                                                                                                            Total = 19.1 FU                                                  Fixtures served
                                                                                                                                                                                         (E)      14.7 FU with hot and cold = 7.0 FU
                                                                                                                            Include load on Pipe F = 19.1 FU                   (F)
                                                                                                                                                                                                             1 DW (hot only) + 1.4 FU
                                                                                                                              No cold-only fixtures                                 Fixtures served                     Total = 8.4 FU
                                                                                                                               occurred on Pipe J + 0.0 FU                  2.8 FA with hot and cold = 11.9 FU 6
                                                                                                                                              Total = 19.1 FU                       2 DW (hot only) + 2.8 FU
                                                                                                                                                                             (J)           Total hot = 14.7 FU
                                                                                                              Include load on Pipe G = 19.1 FU            (G)
                                                                                                                                                                      3.6 FU
                                                                                                                         1 WC (cold) + 2.2 FU                                                                                    SWH
                                                                                                                                                                (K)                                        CW
                                                                                                                                Total = 21.3 FU
                                                                                                                                             (H)                                                                                       5
                                                                                                                                                                                                             KS
                                                                                                                                                                                     WC
                                                                                                                                            (I)                                LAV                         DW                     Fixtures served
                                                                                                                                                                      BT
                                                                                                              Water service                        HB                                                                            with hot and cold = 4.9 FU
                                                                                                              entry = 23.8 FU                                                                                                     1 DW (hot only) + 1.4 FU
                                                                                                                                                                                                                  4
                                                                                                                                                                                                                                             Total = 6.3 FU
                                                                                                              Include load on Pipe H = 21.3 FU
                                                                                                                         1 HB (cold) + 2.5 FU                                                                         2.1 FU
                                                                                                                                Total = 23.8 FU

                                                                                                              indicates hot water
                                                                                                              indicates cold water
                                                                                                                                                                                                                                                       EG00670A


                                                                                                             Figure A-2.6.3.4.(5)-B
                                                                                                             Example of water pipe sizing for buildings containing one or two dwelling units or row houses with separate water
                                                                                                             services


                                                                                                                                                             Table A-2.6.3.4.(5)-B
                                                                                                                                  Sizing of Water Service Pipe Using Figure A-2.6.3.4.(5)-B and Table 2.6.3.4.

                                                                                                                                                                                                             Water Velocity, m/s
                                                                                                                              Fixture Units                                          3.0                               2.4                       1.5
                                                                                                                                                                                                           Nominal Pipe Size, NPS
                                                                                                    Total fixture units                             23.8                              –                               –                           –
                                                                                                    Fire sprinkler system                           n/a                               –                                –                          –
                                                                                                    Irrigation system                               n/a                               –                                –                          –
                                                                                                    Other                                           n/a                               –                                –                          –
                                                                                                            Total demand on water service           23.8                              1                                1                         1¼




                                                                                                    National Plumbing Code of Canada 2020                                                                                                     Division B 2-137
                                                                                                    A-2.7.1.1.                                                                                                    Division B

                                                                                                                                                            Table A-2.6.3.4.(5)-C
                                                                                                                                  Sizing of Hot Water System Using Figure A-2.6.3.4.(5)-B and Table 2.6.3.4.

                                                                                                                                                                                        Water Velocity, m/s
                                                                                                                                         Hot Water
                                                                                                          Pipe Number                                                 3.0                       2.4                    1.5
                                                                                                                                        Fixture Units
                                                                                                                                                                                      Nominal Pipe Size, NPS
                                                                                                                1                            3.5                      ½                         ½                      ½
                                                                                                                2                            6.3                      ½                         ½                      ¾
                                                                                                                3                            8.4                      ¾                         ¾                      ¾
                                                                                                                4                            2.1                      ½                         ½                      ½




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                5                            6.3                      ½                         ½                      ¾
                                                                                                                6                           14.7                      ¾                         ¾                       1
                                                                                                            Total Fixture Units             14.7


                                                                                                                                                            Table A-2.6.3.4.(5)-D
                                                                                                                                  Sizing of Cold Water System Using Figure A-2.6.3.4.(5)-B and Table 2.6.3.4.

                                                                                                                                                                                        Water Velocity, m/s
                                                                                                                                        Cold Water
                                                                                                           Pipe Letter                                                3.0                       2.4                    1.5
                                                                                                                                        Fixture Units
                                                                                                                                                                                      Nominal Pipe Size, NPS
                                                                                                               A                             2.8                      ½                         ½                      ½
                                                                                                               B                             5.7                      ½                         ½                      ¾
                                                                                                               C                             5.7                      ½                         ½                      ¾
                                                                                                               D                            11.4                      ¾                         ¾                       1
                                                                                                               E                            14.7                      ¾                         ¾                       1
                                                                                                               F                            19.1                      ¾                         1                      1¼
                                                                                                               G                            19.1                      ¾                         1                      1¼
                                                                                                               H                            21.3                      1                         1                      1¼
                                                                                                                I                           23.8                      1                         1                      1¼
                                                                                                                J                            2.8                      ½                         ½                      ½
                                                                                                               K                             3.6                      ½                         ½                      ½
                                                                                                            Total Fixture Units             23.8


                                                                                                    A-2.7.1.1. Non-Potable Water System Design. There is a growing interest in Canada in using
                                                                                                    available non-potable water supplies in the place of potable ones for selected purposes such as flushing water
                                                                                                    closets and irrigating lawns and gardens. Article 2.7.1.1. applies to non-potable water systems, regardless of the
                                                                                                    origin of the water. The non-potable water must meet applicable water quality standards as determined by an
                                                                                                    authority having jurisdiction.

                                                                                                    A-2.7.1.1.(1) Good Engineering Practice. Examples of good engineering practice in the design,
                                                                                                    fabrication and installation of non-potable water systems can be found in
                                                                                                       • the ASHRAE Handbooks,
                                                                                                       • the ASPE Handbooks, and
                                                                                                       • CAN/CSA-B128.1, “Design and Installation of Non-Potable Water Systems.”

                                                                                                    A-2.7.2.1.(1) Aboveground Roof Surfaces. While it is possible to harvest rainwater from surfaces
                                                                                                    other than above-ground roofs, such as patios, lawns, gardens, driveways, roadways, parking garages and
                                                                                                    parking lots, these surfaces are not suitable catchments for rainwater harvesting systems because of water
                                                                                                    quality concerns. Water collected from such surfaces may be contaminated with fertilizer, herbicides, fecal
                                                                                                    matter, garbage, oil or chemicals.




                                                                                                    2-138 Division B                                                                            National Plumbing Code of Canada 2020
                                                                                                    Division B                                                                                  A-2.7.2.4.(1)

                                                                                                    The outdoor environment in the local area of the building site, including its immediate surroundings, should be
                                                                                                    investigated to identify contaminants that could adversely affect the quality of the non-potable water delivered
                                                                                                    by the rainwater harvesting system. Contaminants of concern include industrial and urban traffic emissions,
                                                                                                    and pesticides and other agricultural chemicals. Other factors that can influence the levels of contaminants in
                                                                                                    the delivered non-potable water include the building's geometry, and prevailing winds and seasonal activity in
                                                                                                    the local area. Design features should be incorporated in the rainwater harvesting system to mitigate the risks
                                                                                                    associated with any identified contaminants of concern.

                                                                                                    A-2.7.2.2.(1) and 2.7.2.4.(3) and (4) Treatment for Use. Harvested rainwater used in any
                                                                                                    permitted application must be treated appropriately for its intended end use.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    A-2.7.2.3.(1) Pedestrian Traffic. The prohibition of pedestrian traffic on roof surfaces stated in
                                                                                                    Sentence 2.7.2.3.(1) is not intended to include access to roof surfaces by service personnel, such as window
                                                                                                    washers or HVAC mechanics.

                                                                                                    A-2.7.2.3.(2) Roofing and Conveyance Materials. Water is considered to be the “universal solvent.”
                                                                                                    Accordingly, roofing components and conveyance systems that supply rainwater to a rainwater harvesting
                                                                                                    system should be constructed of materials that resist dissolution in water. NSF Pro 151-8-1, “Health Effects
                                                                                                    from Rainwater Catchment System Components,” although directed at potable water systems, is a useful
                                                                                                    source of information on roofing materials to consider.

                                                                                                    A-2.7.2.4.(1) Good Engineering Practice. Examples of good engineering practice in the design,
                                                                                                    fabrication and installation of rainwater harvesting systems can be found in
                                                                                                       • the ASHRAE Handbooks,
                                                                                                       • the ASPE Handbooks,
                                                                                                       • ARCSA/ASPE/ANSI 63, “Rainwater Catchment Systems,” and
                                                                                                       • CSA B805/ICC 805, “Rainwater harvesting systems.”




                                                                                                    National Plumbing Code of Canada 2020                                                            Division B 2-139
                                        Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




2-140 Division B




National Plumbing Code of Canada 2020
Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




                                                                                               Division C

                                                                   Administrative Provisions
Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    Division C



                                                                                                    Part 1
                                                                                                    General




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                      1.1.          Application
                                                                                                      1.1.1.        Application ........................................ 1-1

                                                                                                      1.2.          Terms and Abbreviations
                                                                                                      1.2.1.        Definitions of Words and Phrases .. 1-1
                                                                                                      1.2.2.        Symbols and Other Abbreviations .. 1-1




                                                                                                    National Plumbing Code of Canada 2020
                                        Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




National Plumbing Code of Canada 2020
                                                                                                    Division C



                                                                                                    Part 1
                                                                                                    General




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    Section 1.1. Application
                                                                                                    1.1.1.           Application

                                                                                                    1.1.1.1.         Application

                                                                                                                        1) This Part applies to all plumbing systems covered in this Code. (See
                                                                                                                     Article 1.1.1.1. of Division A.)


                                                                                                    Section 1.2. Terms and Abbreviations
                                                                                                    1.2.1.           Definitions of Words and Phrases

                                                                                                    1.2.1.1.         Non-defined Terms

                                                                                                                        1) Words and phrases used in Division C that are not included in the list of
                                                                                                                     definitions in Article 1.4.1.2. of Division A shall have the meanings that are commonly
                                                                                                                     assigned to them in the context in which they are used, taking into account the
                                                                                                                     specialized use of terms by the various trades and professions to which the terminology
                                                                                                                     applies.

                                                                                                                        2) Where objectives and functional statements are referred to in Division C, they
                                                                                                                     shall be the objectives and functional statements described in Parts 2 and 3 of Division
                                                                                                                     A.

                                                                                                                        3) Where acceptable solutions are referred to in Division C, they shall be the
                                                                                                                     provisions stated in Part 2 of Division B.

                                                                                                                        4) Where alternative solutions are referred to in Division C, they shall be the
                                                                                                                     alternative solutions mentioned in Clause 1.2.1.1.(1)(b) of Division A.

                                                                                                    1.2.1.2.         Defined Terms

                                                                                                                         1) The words and terms in italics in Division C shall have the meanings assigned
                                                                                                                     to them in Article 1.4.1.2. of Division A.

                                                                                                    1.2.2.           Symbols and Other Abbreviations

                                                                                                    1.2.2.1.         Symbols and Other Abbreviations

                                                                                                                        1) The symbols and other abbreviations in Division C shall have the meanings
                                                                                                                     assigned to them in Article 1.4.2.1. of Division A.


                                                                                                    National Plumbing Code of Canada 2020                                                                 Division C 1-1
                                        Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




1-2 Division C




National Plumbing Code of Canada 2020
                                                                                                    Division C



                                                                                                    Part 2
                                                                                                    Administrative Provisions




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                      2.1.          Application
                                                                                                      2.1.1.        Application ........................................ 2-1

                                                                                                      2.2.          Administration
                                                                                                      2.2.1.        Administration .................................. 2-1
                                                                                                      2.2.2.        Plumbing Drawings and Related
                                                                                                                    Documents ........................................ 2-1

                                                                                                      2.3.          Alternative Solutions
                                                                                                      2.3.1.        Documentation of Alternative
                                                                                                                    Solutions ........................................... 2-1

                                                                                                                    Notes to Part 2 .................. 2-3




                                                                                                    National Plumbing Code of Canada 2020
                                        Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




National Plumbing Code of Canada 2020
                                                                                                    Division C



                                                                                                    Part 2
                                                                                                    Administrative Provisions




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    Section 2.1. Application
                                                                                                    2.1.1.           Application
                                                                                                    2.1.1.1.         Application
                                                                                                                        1) This Part applies to all plumbing systems covered in this Code. (See
                                                                                                                     Article 1.1.1.1. of Division A.)


                                                                                                    Section 2.2. Administration
                                                                                                    2.2.1.           Administration
                                                                                                    2.2.1.1.         Administrative Requirements
                                                                                                                        1) This Code shall be administered in conformance with the appropriate provincial
                                                                                                                     or territorial regulations, municipal bylaws or, in the absence of such regulations
                                                                                                                     or bylaws, in conformance with the applicable requirements in the Administrative
                                                                                                                     Requirements for Use with the National Building Code of Canada 1985.

                                                                                                    2.2.2.           Plumbing Drawings and Related Documents
                                                                                                    2.2.2.1.         Information Required on Plumbing Drawings and Related Documents
                                                                                                                        1) Plumbing drawings and related documents submitted with the application for
                                                                                                                     a plumbing permit shall show
                                                                                                                         a) the location and nominal pipe size of every building drain and of every trap
                                                                                                                            and cleanout fitting that is on a building drain,
                                                                                                                        b) the location and nominal pipe size of every sanitary drainage pipe, trap and
                                                                                                                            vent pipe, and
                                                                                                                         c) a layout of the potable water distribution system, including nominal pipe sizes
                                                                                                                            and valves.


                                                                                                    Section 2.3. Alternative Solutions
                                                                                                    2.3.1.           Documentation of Alternative Solutions
                                                                                                                     (See Note A-2.3.1.)

                                                                                                    2.3.1.1.         Documentation
                                                                                                                        1) Documentation conforming to this Subsection shall be provided by the person
                                                                                                                     requesting the use of an alternative solution to demonstrate that the proposed
                                                                                                                     alternative solution complies with this Code.


                                                                                                    National Plumbing Code of Canada 2020                                                              Division C 2-1
                                                                                                    2.3.1.1.                                                                                         Division C

                                                                                                                        2) The documentation referred to in Sentence (1) shall include
                                                                                                                        a) a Code analysis outlining the analytical methods and rationales used to
                                                                                                                           determine that the proposed alternative solution will achieve at least the
                                                                                                                           level of performance required by Clause 1.2.1.1.(1)(b) of Division A, and
                                                                                                                        b) information concerning any special maintenance or operation requirements,
                                                                                                                           including any plumbing system component commissioning requirements,
                                                                                                                           that are necessary for the alternative solution to achieve compliance with
                                                                                                                           the Code after the plumbing system is installed.

                                                                                                                        3) The Code analysis referred to in Clause (2)(a) shall identify the applicable
                                                                                                                     objectives, functional statements and acceptable solutions, and any assumptions,
                                                                                                                     limiting or restricting factors, testing procedures, engineering studies or performance




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                     parameters that will support a Code compliance assessment.

                                                                                                                        4) The Code analysis referred to in Clause (2)(a) shall include information
                                                                                                                     about the qualifications, experience and background of the person or persons taking
                                                                                                                     responsibility for the design.

                                                                                                                         5) The information provided under Sentence (3) shall be in sufficient detail to
                                                                                                                     convey the design intent and to support the validity, accuracy, relevance and precision
                                                                                                                     of the Code analysis.

                                                                                                                        6) Where the design of a plumbing system includes proposed alternative solutions
                                                                                                                     that involve more than one person taking responsibility for different aspects of the
                                                                                                                     design, the applicant for the permit shall identify a single person to co-ordinate
                                                                                                                     the preparation of the design, Code analysis and documentation referred to in this
                                                                                                                     Subsection.




                                                                                                    2-2 Division C                                                                 National Plumbing Code of Canada 2020
                                                                                                    Division C



                                                                                                    Notes to Part 2
                                                                                                    Administrative Provisions




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    A-2.3.1. Documentation of Alternative Solutions. Beyond the purposes of demonstrating
                                                                                                    compliance and acquiring an installation permit, there are other important reasons for requiring that the
                                                                                                    proponent of an alternative solution submit project documentation (i.e. a compliance report) to the authority
                                                                                                    having jurisdiction and for the authority having jurisdiction to retain that documentation for a substantial
                                                                                                    period following the installation of a plumbing system:
                                                                                                      • Most jurisdictions require that a plumbing system be maintained in compliance with the codes under
                                                                                                         which it was installed. Alternative solutions made possible by objective-based codes may have special
                                                                                                         maintenance requirements, which would be described in the documentation.
                                                                                                      • Documentation helps consultants perform code compliance assessments of existing buildings or facilities
                                                                                                         before they are sold and informs current owners or prospective buyers of existing buildings or facilities of
                                                                                                         any limitations pertaining to their future use or development.
                                                                                                      • Documentation provides design professionals with the basic information necessary to design changes to
                                                                                                         an existing plumbing system.
                                                                                                      • An alternative solution could be invalidated by a proposed alteration to a plumbing system. Designers
                                                                                                         and regulators must therefore know the details of the particular alternative solutions that were integral to
                                                                                                         the original design. Complete documentation should provide insight as to why one alternative solution
                                                                                                         was chosen over another.
                                                                                                      • Documentation is the “paper trail” of the alternative solution negotiated between the designer and the
                                                                                                         regulator and should demonstrate that a rational process led to the acceptance of the alternative solution
                                                                                                         as an equivalency.
                                                                                                      • It is possible that over time a particular alternative solution may be shown to be inadequate. It would be
                                                                                                         advantageous for a jurisdiction to know which plumbing systems included that alternative solution as
                                                                                                         part of their design: documentation will facilitate this type of analysis.
                                                                                                      • Project documentation provides important information to a forensic team that is called to investigate an
                                                                                                         accident or why a design failed to provide the level of performance expected.
                                                                                                    This subject is discussed in further detail in “Recommended Documentation Requirements for Projects Using
                                                                                                    Alternative Solutions in the Context of Objective-Based Codes,” which was prepared for the CCBFC Task
                                                                                                    Group on Implementation of Objective-Based Codes and is available on the NRC's website.

                                                                                                    These Notes are included for explanatory purposes only and do not form part of the requirements. The number
                                                                                                    that introduces each Note corresponds to the applicable requirement in this Part.




                                                                                                    National Plumbing Code of Canada 2020                                                                         Division C 2-3
                                        Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays




2-4 Division C




National Plumbing Code of Canada 2020
                                                                                                    Index




                                                                                                                                   A                                           protection of drinking fountains, 2.4.2.1.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                               protection of make-up water, 2.7.2.4.
                                                                                                                                                                               protection of potable water system, 2.6.2.6., 2.6.2.7.,
                                                                                                    Abbreviations                                                                  2.7.2.4.
                                                                                                      other abbreviations, 1.4.2.1. [A]                                        protection of rainwater storage tanks, 2.7.2.4.
                                                                                                      proper names, 1.3.2.1.                                                 Backflow preventers
                                                                                                      symbols, 1.4.2.1. [A]                                                    for back-siphonage prevention, 2.6.2.2.
                                                                                                    Acceptable solutions, 1.1.2.1., 1.2.1.1. [A], 1.5.1.1. [A]                 definition, 1.4.1.2. [A]
                                                                                                    Accessibility of fixtures and equipment, 2.1.3.2.                          fire protection systems, used in, 2.6.2.4.
                                                                                                    Acrylonitrile-butadiene-styrene (ABS) pipe and pipe                        installation, 2.6.2.1.
                                                                                                         fittings, 2.2.5.9. - 2.2.5.11., 2.3.4.5., 2.4.6.4.                    maintenance of effectiveness, 2.6.2.12.
                                                                                                    Additional circuit vents                                                   for premise isolation, 2.6.2.6.
                                                                                                      for branches, 2.5.3.1.                                                   protection against thermal expansion, 2.6.1.11.
                                                                                                      definition, 1.4.1.2. [A]                                                 standards for, 2.2.10.10.
                                                                                                      for fixtures, 2.5.3.1.                                                 Back pressure
                                                                                                      for fixtures draining into vent pipes, 2.5.4.5.                          backflow caused by, 2.6.2.3.
                                                                                                      sizing, 2.5.3.1., 2.5.7.3., 2.5.8.5.                                     definition, 1.4.1.2. [A]
                                                                                                      for traps, 2.5.1.1.                                                      fire protection systems, 2.6.2.4.
                                                                                                    Administration of Code, 2.2. [C]                                         Back-siphonage
                                                                                                    Air admittance valves, 1.4.1.2. [A], 2.2.10.16., 2.5.9.                    definition, 1.4.1.2. [A]
                                                                                                    Air breaks, 1.4.1.2. [A], 2.3.3.11., 2.4.2.3., 2.6.1.7.                    with direct flush valves, 2.2.10.8.
                                                                                                    Air gaps, 1.4.1.2. [A], 2.6.2.2., 2.6.2.3., 2.6.2.9., 2.7.2.4.             fire protection systems, 2.6.2.4.
                                                                                                    Air pressure tests, 2.3.6.1. - 2.3.6.3., 2.3.6.5., 2.3.7.1.,               prevention, 2.6.2.2.
                                                                                                         2.3.7.2.                                                              with relief valves, 2.6.1.7.
                                                                                                    Alloyed zinc, 1.4.1.2. [A], 2.2.10.14.                                   Back-siphonage preventers
                                                                                                    Alternative solutions                                                      definition, 1.4.1.2. [A]
                                                                                                      compliance with Code, 1.2.1.1. [A]                                       standards for, 2.2.10.10.
                                                                                                      documentation, 2.3.1. [C]                                                for tank-type water closets, 2.6.2.11.
                                                                                                    Ancillary buildings, 2.1.2.4.                                            Backwater valves
                                                                                                    Application of Code                                                        definition, 1.4.1.2. [A]
                                                                                                      Division A, 1.3.2. [A]                                                   protection of branches, 2.4.6.4.
                                                                                                      Division B, 1.3.3. [A]                                                   protection of building drains, 2.4.6.4.
                                                                                                      Division C, 1.3.4. [A]                                                   protection of drainage pans on heating/cooling
                                                                                                      general, 1.1.1.1. [A]                                                        units, 2.4.2.1.
                                                                                                    Autopsy tables, 2.4.9.3.                                                   protection of drinking fountains, 2.4.2.1.
                                                                                                    Auxiliary water supply, 1.4.1.2. [A]                                       protection of rainwater storage tanks, 2.7.2.4.
                                                                                                                                                                               protection of sumps, 2.4.3.6., 2.4.6.3.
                                                                                                                                                                             Ball tests, 2.3.6.1., 2.3.6.2., 2.3.6.7.
                                                                                                                                   B                                         Bathroom group, 1.4.1.2. [A], 2.4.9.3., 2.6.3.2.
                                                                                                                                                                             Bathtubs, 2.2.2.2., 2.2.10.7., 2.4.9.3., 2.6.3.2.
                                                                                                    Backfilling of pipe trench, 2.3.5.1.                                     Bedpan washers, 2.6.3.2.
                                                                                                    Backflow                                                                 Beer cabinets, 2.4.9.3.
                                                                                                      caused by back pressure, 2.6.2.3., 2.6.2.4.                            Bell and spigot pipe, 2.3.2.7.
                                                                                                      definition, 1.4.1.2. [A]                                               Bell traps, 2.2.3.1.
                                                                                                      from fire protection systems, 2.6.2.4.                                 Bidets, 2.4.9.3., 2.6.3.2.
                                                                                                      protection of building drains, 2.4.6.4.                                Bolts, 2.2.10.2., 2.2.10.3.
                                                                                                      protection of drainage pans on heating/cooling                         Branches
                                                                                                         units, 2.4.2.1.                                                       definition, 1.4.1.2. [A]

                                                                                                    [A] – Reference occurs in Division A.   [C] – Reference occurs in Division C.   All other references occur in Division B.


                                                                                                    National Plumbing Code of Canada 2020                                                                                        Index
                                                                                                      hydraulic loads, 2.4.10.6., 2.4.10.7.                    Catch basins
                                                                                                      protection from backflow, 2.4.6.4.                          cast-iron frames and covers for, 2.2.6.2.
                                                                                                      serving water closets, 2.4.9.2.                             concrete, 2.2.5.2.
                                                                                                      sizing, 2.4.9.2.                                         Caulked lead drainage joints, 2.3.2.1.
                                                                                                    Branch vents                                               Caulking compounds, 2.3.2.7.
                                                                                                      definition, 1.4.1.2. [A]                                 Cellular core PVC pipe and fittings, 2.2.5.16.
                                                                                                      protection of drainage systems, 2.5.1.1.                 Cement mortar, 2.2.9.1.
                                                                                                      sizing, 2.5.7.2., 2.5.8.3.                               Cement-mortar lining, 2.2.6.4.
                                                                                                    Brass floor flanges, 2.2.10.1.                             Ceramic china fixtures, 2.2.2.2.
                                                                                                    Brass pipe, 2.2.7.1., 2.3.4.5.                             Check valves, 1.4.1.2. [A], 2.6.1.5., 2.6.1.11.
                                                                                                    Brass pipe flanges and flanged fittings, 2.2.7.2.             for backflow prevention, 2.4.6.4., 2.6.2.3., 2.6.2.4.
                                                                                                    Brass threaded water fittings, 2.2.7.3.                       for back-siphonage prevention, 2.6.2.2.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    Brazing alloys, 2.2.9.2.                                      protection of drainage pans on heating/cooling
                                                                                                    Bronze pipe flanges and flanged fittings, 2.2.7.2.                units, 2.4.2.1.
                                                                                                    Bronze threaded water fittings, 2.2.7.3.                      protection of drinking fountains, 2.4.2.1.
                                                                                                    Building drains                                               protection of pumped sump, 2.4.6.3.
                                                                                                      cleanouts, 2.4.7.1., 2.4.7.2.                            Chemical storage locations, 2.4.3.4.
                                                                                                      combined, 1.4.1.2. [A], 2.1.2.1., 2.4.6.1.               Chlorinated polyvinyl chloride (CPVC) pipe and
                                                                                                      definition, 1.4.1.2. [A]                                        fittings, 2.2.5.8., 2.2.5.9., 2.2.5.11., 2.3.4.5.
                                                                                                      drawings for plumbing permit, 2.2.2.1. [C]               Circuit vents
                                                                                                      hydraulic loads, 2.4.10.6., 2.4.10.8., 2.4.10.9.            additional (see Additional circuit vents)
                                                                                                      protection from backflow, 2.4.6.4.                          for branches, 2.5.3.1.
                                                                                                      protection from damage, 2.3.5.                              definition, 1.4.1.2. [A]
                                                                                                      sanitary, 1.4.1.2. [A], 2.4.2.1., 2.4.6.1., 2.4.6.2.        for fixtures, 2.5.3.1.
                                                                                                      sizing, 2.4.9.1., 2.4.9.2., 2.4.9.4.                        for fixtures draining into vent pipes, 2.5.4.5.
                                                                                                      storm, 1.4.1.2. [A], 2.4.10.9.                              sizing, 2.5.7.3., 2.5.8.3.
                                                                                                      venting, 2.5.7.2., 2.5.8.4.                                 for traps, 2.5.1.1.
                                                                                                    Buildings                                                  Classes of fire sprinkler/standpipe systems, 1.4.1.2. [A],
                                                                                                      ancillary, 2.1.2.4.                                             2.6.2.4.
                                                                                                      definition, 1.4.1.2. [A]                                 Cleaning of potable water systems, 2.6.2.8.
                                                                                                    Building sewers                                            Cleanouts
                                                                                                      cleanouts, 2.4.7.1., 2.4.7.2.                               accessibility for cleaning and maintenance, 2.1.3.2.
                                                                                                      combined, 1.4.1.2. [A], 2.4.5.2., 2.4.10.9.                 definition, 1.4.1.2. [A]
                                                                                                      definition, 1.4.1.2. [A]                                    for drainage systems, 2.4.7.1.
                                                                                                      developed length, 2.4.7.2.                                  drawings for plumbing permit, 2.2.2.1. [C]
                                                                                                      hydraulic loads, 2.4.10.6., 2.4.10.8., 2.4.10.9.            fittings, 2.2.10.3., 2.4.7.1.
                                                                                                      mobile homes, 2.4.6.5.                                      installation, 2.4.7.
                                                                                                      sanitary, 1.4.1.2. [A], 2.4.7., 2.4.10.8.                   location, 2.1.3.2., 2.4.7.1., 2.4.7.4.
                                                                                                      sizing, 2.4.7.2., 2.4.9.4.                                  manholes as, 2.4.7.1., 2.4.7.3., 2.5.7.6.
                                                                                                    Building traps                                                rodding, 2.4.7.2., 2.4.7.4.
                                                                                                      cleanouts, 2.4.5.4.                                         sizing and spacing, 2.4.7.2.
                                                                                                      definition, 1.4.1.2. [A]                                    for traps, 2.2.3.1., 2.4.5.2. - 2.4.5.4., 2.4.7.1., 2.4.7.4.
                                                                                                      fresh air inlets, 2.5.1.1., 2.5.5.4.                     Clear-water waste, 1.4.1.2. [A], 2.4.2.1., 2.4.4.2., 2.4.5.1.
                                                                                                      location, 2.4.5.4.                                       Climatic data, for hydraulic load determination,
                                                                                                      for sanitary drainage systems, 2.4.5.1., 2.4.5.3.               2.4.10.4.
                                                                                                      seals, 2.4.5.5.                                          Clothes washers, 2.4.2.1., 2.4.5.1., 2.4.9.3., 2.6.3.2.,
                                                                                                      for storm drainage systems, 2.4.5.2.                            2.7.2.2.
                                                                                                    Butt fusion fittings, 2.2.5.4.                             Cold-caulked joints, 2.3.2.7.
                                                                                                    Butt weld pipe fittings, 2.3.2.8.                          Combined building drains
                                                                                                                                                                  definition, 1.4.1.2. [A]
                                                                                                                                                                  hydraulic loads, 2.4.10.9.
                                                                                                                                C                                 restrictions on use, 2.1.2.1., 2.4.6.1.
                                                                                                                                                               Combined sewers
                                                                                                                                                                  connections, 2.1.2.1., 2.1.2.2., 2.4.5.2.
                                                                                                    Care or detention occupancy, 1.4.1.2. [A], 2.4.4.3.
                                                                                                                                                                  definition, 1.4.1.2. [A]
                                                                                                    Cast-iron drainage and vent pipe and fittings, 2.2.6.1.,
                                                                                                         2.2.6.3.                                              Combined temperature- and pressure-relief valves,
                                                                                                                                                                      2.2.10.11., 2.6.1.7.
                                                                                                    Cast-iron fittings, 2.2.6.1., 2.2.6.3., 2.2.6.5.
                                                                                                                                                               Combustible
                                                                                                    Cast-iron fixtures, 2.2.2.2.
                                                                                                    Cast-iron pipes, 2.3.2.1., 2.3.3.3., 2.3.3.8., 2.3.4.5.       definition, 1.4.1.2. [A]
                                                                                                                                                                  piping, 2.2.5.11.
                                                                                                    Cast-iron traps, 2.2.3.1., 2.3.3.8.
                                                                                                    Cast-iron water pipe and fittings, 2.2.6.4., 2.2.6.5.


                                                                                                    Index                                                                            National Plumbing Code of Canada 2020
                                                                                                    Compliance                                                                                       D
                                                                                                      with Code, 1.2.1.1. [A]
                                                                                                      materials, systems and equipment, 1.2.2. [A]
                                                                                                                                                                        Dead ends in piping, 1.4.1.2. [A], 2.4.6.1.
                                                                                                    Concrete pipe and fittings, 2.2.5.2.
                                                                                                                                                                        Definitions
                                                                                                    Condensation, protection against, 2.3.5.5.
                                                                                                                                                                          defined terms, 1.4.1.2. [A]
                                                                                                    Conflicting requirements, 1.5.1.2. [A]
                                                                                                                                                                          non-defined terms, 1.4.1.1. [A]
                                                                                                    Connections
                                                                                                                                                                        Dental units, 2.4.9.3., 2.6.3.2.
                                                                                                      direct, 1.4.1.2. [A], 2.4.2.1., 2.4.2.3.
                                                                                                                                                                        Developed length
                                                                                                      of dissimilar materials, 2.3.3.6.
                                                                                                                                                                          of branch vents, 2.5.8.3.
                                                                                                      drainage systems, 2.1.2.1., 2.1.2.2., 2.4.2., 2.4.3.4.,
                                                                                                                                                                          of building sewers, 2.4.7.2.
                                                                                                          2.4.5.3.
                                                                                                                                                                          of circuit vents, 2.5.8.3.
                                                                                                      of drains, 2.4.2.1., 2.4.2.3., 2.4.3.4., 2.4.3.6.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                          of continuous vents, 2.5.8.3.
                                                                                                      of fixtures, 2.4.2.1. - 2.4.2.3., 2.4.3.4., 2.4.4.4., 2.5.4.2.,
                                                                                                                                                                          definition, 1.4.1.2. [A]
                                                                                                          2.5.5.5., 2.5.6.4.
                                                                                                                                                                          of fixture outlet pipes, 2.4.8.2.
                                                                                                      increasers, 2.3.3.5.
                                                                                                                                                                          of potable water distribution systems, 2.6.1.1.
                                                                                                      indirect, 1.4.1.2. [A], 2.3.3.11., 2.4.2.1., 2.4.3.2.,
                                                                                                                                                                          of stack vents, 2.5.8.4.
                                                                                                          2.4.4.4., 2.4.5.1.
                                                                                                                                                                          of trap arm for vent pipes, 2.5.6.3.
                                                                                                      lead bend, 2.4.2.1.
                                                                                                                                                                          of vent headers, 2.5.8.3.
                                                                                                      nominally horizontal offset, 2.4.2.1.
                                                                                                                                                                        Dilution tanks, 2.4.4.4., 2.5.5.3., 2.5.7.7., 2.5.8.5.
                                                                                                      nominally horizontal sanitary drainage pipe,
                                                                                                                                                                        Direct flush valves, 2.2.10.8.
                                                                                                          2.4.2.1.
                                                                                                                                                                        Directly connected
                                                                                                      of outlet fixtures, 2.3.3.8.
                                                                                                                                                                          definition, 1.4.1.2. [A]
                                                                                                      of overflows from rainwater tanks, 2.4.2.2., 2.7.2.4.
                                                                                                                                                                          fixture outlet pipes, 2.4.2.3.
                                                                                                      reducers, 2.3.3.5.
                                                                                                                                                                          fixtures, 2.4.2.1.
                                                                                                      of roof drains, 2.3.3.7.
                                                                                                                                                                        Dishwashers, 2.4.5.1., 2.4.9.3., 2.6.3.2.
                                                                                                      running thread and packing nut, 2.3.3.4.
                                                                                                                                                                        Dishwashing sinks, overflows, 2.2.2.4.
                                                                                                      of separate services, 2.1.2.4.
                                                                                                                                                                        Dissimilar materials, joints and connections for,
                                                                                                      of storm drainage systems, 2.1.2.2., 2.4.5.2.
                                                                                                                                                                             2.3.3.6.
                                                                                                      of subsoil drainage, 2.4.5.3., 2.4.6.4.
                                                                                                                                                                        Documents
                                                                                                      unions and slip joints, 2.3.3.4.
                                                                                                                                                                          plumbing drawings and related documents,
                                                                                                      of vent pipes and circuit venting, 2.4.2.1., 2.5.3.,
                                                                                                                                                                             2.2.2.1. [C]
                                                                                                          2.5.5.5., 2.5.6.2., 2.5.6.4.
                                                                                                                                                                          referenced, 1.5.1. [A]
                                                                                                      of water systems, 2.1.2.3., 2.6.2.1., 2.6.2.3., 2.6.2.4.,
                                                                                                                                                                        Downspouts (see Leaders)
                                                                                                          2.7.1.1.
                                                                                                                                                                        Drainage equipment, 2.4.6.3.
                                                                                                    Contamination protection
                                                                                                                                                                        Drainage fittings
                                                                                                      hazardous waste, 2.4.7.4.
                                                                                                                                                                          cast-iron, 2.2.6.3.
                                                                                                      potable water systems, 2.6.2.
                                                                                                                                                                          solder-joint, 2.2.7.5.
                                                                                                    Continuous vents, 1.4.1.2. [A], 2.5.1.1., 2.5.2.1., 2.5.8.3.
                                                                                                                                                                        Drainage joints, caulked lead, 2.3.2.1.
                                                                                                    Cooling of hot liquid waste, 2.4.4.2.
                                                                                                                                                                        Drainage pans, 2.4.2.1., 2.6.1.7.
                                                                                                    Copper joints, 2.3.3.12.
                                                                                                                                                                        Drainage piping
                                                                                                    Copper pipe, 2.2.7.1., 2.3.4.3., 2.3.4.5.
                                                                                                                                                                          arrangement, 2.4.6.
                                                                                                    Copper tube, 2.2.7.4., 2.3.3.2., 2.3.3.10., 2.3.4.3.
                                                                                                                                                                          cast iron, 2.2.6.1.
                                                                                                    Corrosion-resistant materials, 2.2.2.1., 2.2.8., 2.2.10.2.,
                                                                                                                                                                          hydraulic loads, 2.4.10.
                                                                                                          2.4.7.3.
                                                                                                                                                                          location, 2.4.6.2.
                                                                                                    Couplings
                                                                                                                                                                          minimum slope and length, 2.4.8.
                                                                                                      corrugated steel, 2.2.6.8.
                                                                                                                                                                          potable water distribution systems, 2.6.1.2.
                                                                                                      mechanical, 2.2.10.4.
                                                                                                                                                                          sizing, 2.4.9.
                                                                                                    CPVC (Chlorinated polyvinyl chloride) pipe and
                                                                                                                                                                        Drainage systems
                                                                                                          fittings, 2.2.5.8., 2.2.5.9., 2.2.5.11., 2.3.4.5.
                                                                                                                                                                          application of Code, 1.1.1.1. [A]
                                                                                                    Critical level, 1.4.1.2. [A], 2.6.2.10.
                                                                                                                                                                          arrangement of piping, 2.4.6.
                                                                                                    Cross fittings, 2.2.4.1.
                                                                                                                                                                          cleanouts, 2.4.7.
                                                                                                    Crosslinked polyethylene/aluminum/crosslinked
                                                                                                                                                                          connections, 2.1.2.1., 2.1.2.2., 2.4.2., 2.4.3.4., 2.4.5.3.
                                                                                                          polyethylene (PEX/AL/PEX) pipe and fittings,
                                                                                                                                                                          definition, 1.4.1.2. [A]
                                                                                                          2.2.5.13., 2.3.4.5.
                                                                                                                                                                          materials and equipment, 2.2.1.1.
                                                                                                    Crosslinked polyethylene pipe and fittings, 2.2.5.6.,
                                                                                                                                                                          piping and fittings, 2.2.4.1., 2.2.5.3., 2.2.5.9., 2.2.6.,
                                                                                                          2.3.4.5.
                                                                                                                                                                             2.2.7.3., 2.2.7.4.
                                                                                                    Cuspidors, 2.4.9.3., 2.6.3.2.
                                                                                                                                                                          sanitary, 2.1.2.1., 2.4.2.1., 2.4.4.1., 2.4.5.1., 2.4.7.1.
                                                                                                                                                                          size of pipes, 2.4.9.
                                                                                                                                                                          storm, 2.1.2.2., 2.4.5.2., 2.4.7.1.
                                                                                                                                                                          testing, 2.3.6.
                                                                                                                                                                          traps, 2.2.3.1., 2.4.5.1., 2.4.5.2.


                                                                                                    National Plumbing Code of Canada 2020                                                                                        Index
                                                                                                      treatment of sewage and wastes, 2.4.4.                        non-ferrous, 2.2.7.
                                                                                                      venting, 2.5.1.1., 2.5.6.4.                                   non-metallic, 2.2.5.
                                                                                                    Drains (see Building drains; Fixture drains; Floor              PE/AL/PE, 2.2.5.12.
                                                                                                          drains; Roof drains)                                      PE-RT, 2.2.5.15.
                                                                                                    Drawings and related documents, 2.2.2. [C]                      PEX/AL/PEX, 2.2.5.13.
                                                                                                    Drilled and tapped joints, 2.3.3.1.                             plastic, 2.2.5.9., 2.2.5.11.
                                                                                                    Drinking fountain bubblers, 2.2.10.9.                           polyethylene, 2.2.5.4.
                                                                                                    Drinking fountains, 2.4.2.1., 2.4.5.1., 2.4.9.3., 2.6.3.2.      polypropylene, 2.2.5.14.
                                                                                                    Drum traps, 2.2.3.1.                                            PVC, 2.2.5.7.
                                                                                                    Dual vents, 1.4.1.2. [A], 2.5.1.1., 2.5.8.2., 2.5.9.1.          reducers, 2.3.3.5.
                                                                                                    Dwelling units, 1.4.1.2. [A], 2.6.3.1., 2.6.3.4.                restrictions on use, 2.2.4., 2.2.5.2., 2.2.5.3., 2.2.5.16.,
                                                                                                                                                                       2.2.6.1., 2.2.6.3., 2.2.6.5. - 2.2.6.7., 2.2.7.3. - 2.2.7.5.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                                                                    sanitary T, 2.2.4.2., 2.5.4.5.
                                                                                                                                E                                   screwed, 2.2.6.5., 2.2.6.6.
                                                                                                                                                                    solder-joint, 2.2.7.5., 2.2.7.6.
                                                                                                    Eavestroughs (see Roof gutters)                                 stainless steel butt weld, 2.2.6.11.
                                                                                                    Ejectors for sumps, 2.4.6.3.                                    stainless steel threaded, 2.2.6.13.
                                                                                                    Elbow (90°) fittings, 2.2.4.3.                                  supply and waste, 2.2.10.6.
                                                                                                    Electrical insulation of piping supports, 2.3.4.3.              T, 2.2.4.1.
                                                                                                    Elevator pits, 2.4.3.6.                                         used in buildings, 2.2.5.11.
                                                                                                    Emergency floor drains, 1.4.1.2. [A], 2.5.2.1.                  used underground, 2.2.5.9.
                                                                                                    Enamelled fixtures, 2.2.2.2.                                    vitrified clay, 2.2.5.3.
                                                                                                    Expansion and contraction, piping system, 2.3.3.9.,          Fixture drains
                                                                                                          2.6.1.11.                                                 cleanouts, 2.4.7.1.
                                                                                                    Exposure of materials, 2.2.1.1.                                 connections to circuit vents, 2.5.3.1.
                                                                                                    Extracted tees, 2.3.3.2.                                        connections to wet vents, 2.5.2.1.
                                                                                                                                                                    definition, 1.4.1.2. [A]
                                                                                                                                                                    directly connected, 2.4.2.3.
                                                                                                                                F                                   fixture traps, 2.5.6.3.
                                                                                                                                                                    for floor outlet fixtures, 2.3.3.8.
                                                                                                                                                                    indirectly connected, 2.3.3.11.
                                                                                                    Ferrous pipe and fittings, 2.2.6.
                                                                                                    Final tests, 2.3.6.6.                                           protection from backflow, 2.4.6.4.
                                                                                                                                                                    venting of traps, 2.5.1.1.
                                                                                                    Fire protection systems, backflow, 2.6.2.4.
                                                                                                                                                                 Fixture outlet pipes
                                                                                                    Fire separations, 1.4.1.2. [A], 2.2.5.11.
                                                                                                    Fire service pipes, 1.4.1.2. [A], 2.6.2.4.                      as cleanouts, 2.4.7.1.
                                                                                                                                                                    definition, 1.4.1.2. [A]
                                                                                                    Fittings
                                                                                                                                                                    developed length, 1.4.1.2. [A], 2.4.8.2.
                                                                                                       90° elbows, 2.2.4.3.
                                                                                                       ABS, 2.2.5.9.                                                directly connected, 2.4.2.3.
                                                                                                                                                                    size, 2.4.9.3.
                                                                                                       brass or bronze, 2.2.7.2., 2.2.7.3.
                                                                                                                                                                 Fixtures
                                                                                                       butt-fusion, 2.2.5.4.
                                                                                                       cast-iron, 2.2.6.1., 2.2.6.3., 2.2.6.5.                      in chemical storage locations, 2.4.3.4.
                                                                                                                                                                    conformance to standards, 2.2.2.2.
                                                                                                       cellular core PVC, 2.2.5.16.
                                                                                                                                                                    connections, 2.3.3.8., 2.4.2.1. - 2.4.2.3.
                                                                                                       cleanouts, 2.2.10.3., 2.4.7.1., 2.4.7.4.
                                                                                                       concrete, 2.2.5.2.                                           construction, 2.2.2.
                                                                                                                                                                    definition, 1.4.1.2. [A]
                                                                                                       corrosion-resistant, 2.2.8.1.
                                                                                                                                                                    design, 2.6.1.1.
                                                                                                       couplings, 2.2.6.8., 2.2.10.4., 2.3.2.6.
                                                                                                       CPVC, 2.2.5.8.                                               directly connected, 2.4.2.1., 2.4.2.3.
                                                                                                                                                                    draining into vent pipes, 2.5.4.5.
                                                                                                       cross, 2.2.4.1.
                                                                                                                                                                    hydraulic loads, 2.4.9.3., 2.4.10.2., 2.4.10.3.,
                                                                                                       crosslinked polyethylene, 2.2.5.6.
                                                                                                       drainage, 2.5.4.3.                                              2.4.10.12., 2.6.3.2.
                                                                                                                                                                    indirectly connected, 2.3.3.11., 2.4.2.1., 2.4.5.1.
                                                                                                       drawings for plumbing permit, 2.2.2.1. [C]
                                                                                                                                                                    installation, 2.1.3.1., 2.3.4.1., 2.3.4.2., 2.4.3., 2.6.1.3.
                                                                                                       ferrous, 2.2.6., 2.2.10.3.
                                                                                                       fibrocement, 2.2.5.1.                                        location, 2.1.3.2., 2.4.7.4.
                                                                                                                                                                    maximum water use, 2.6.1.6.
                                                                                                       flanged, 2.2.7.2.
                                                                                                                                                                    provision for future installation, 2.5.5.5.
                                                                                                       flared-joint, 2.2.7.7.
                                                                                                       increasers, 2.3.3.5.                                         restrictions on re-use, 2.2.1.2.
                                                                                                                                                                    separately vented, 2.5.3.1.
                                                                                                       installation of pipe, 2.3.2.1.
                                                                                                                                                                    size of supply pipe, 2.6.3.2.
                                                                                                       lead, 2.2.7.8.
                                                                                                       malleable-iron, 2.2.6.6.                                     surface requirements, 2.2.2.1.
                                                                                                                                                                    trap arms, 2.5.6.3.
                                                                                                       marking, 2.2.1.3.
                                                                                                       minimum pressure, 2.2.1.5.


                                                                                                    Index                                                                               National Plumbing Code of Canada 2020
                                                                                                       vent pipes, 2.5.6.4.                                           Hub and spigot pipe, 2.3.2.1.
                                                                                                       vent stacks for, 2.5.4.2.                                      Hydrants, frost-proof, 2.6.1.4.
                                                                                                    Fixture units                                                     Hydraulic loads
                                                                                                       conversion to litres, 2.4.10.5.                                  circuit vents, 2.5.3.1., 2.5.8.3.
                                                                                                       definitions, 1.4.1.2. [A]                                        continuous vents, 2.5.8.3.
                                                                                                    Flanges                                                             determination, 2.4.10.
                                                                                                       brass floor, 2.2.10.1., 2.3.3.8.                                 sizing of fixture outlet pipes, 2.4.9.3.
                                                                                                       brass or bronze pipe, 2.2.7.2.                                   sizing of water distribution systems, 2.6.3.2.,
                                                                                                       floor, 2.2.10.1., 2.2.10.2., 2.3.3.8.                               2.6.3.4.
                                                                                                       lead, 2.3.2.2.                                                   vent stacks, 2.5.8.4.
                                                                                                       stainless steel pipe, 2.2.6.12.                                  wet vents, 2.5.2.1., 2.5.8.1.
                                                                                                    Flared-joint fittings, 2.2.7.7., 2.3.3.12.                        Hydromassage bathtubs, 2.2.2.2.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    Flared joints, 2.3.2.5.
                                                                                                    Flashing, vent pipe, 2.2.10.14., 2.5.6.5.
                                                                                                    Flexible water connectors, 2.2.10.18.                                                            I
                                                                                                    Flood level rim, 1.4.1.2. [A]
                                                                                                    Floor drains                                                      Iceboxes, 2.4.9.3.
                                                                                                       in chemical storage locations, 2.4.3.4.                        Identification
                                                                                                       connections to drainage system, 2.4.2.1., 2.4.3.4.                materials and equipment, 2.2.1.3., 2.7.1.2.
                                                                                                       emergency, 1.4.1.2. [A], 2.5.2.1.                                 non-potable water systems, 2.7.1.2.
                                                                                                       size of outlet pipes, 2.4.9.3.                                 Increaser fittings, 2.3.3.5.
                                                                                                       traps, 2.4.5.1., 2.4.5.2., 2.5.1.1.                            Indirect connections, 2.3.3.11., 2.4.2.1., 2.4.3.2., 2.4.4.4.,
                                                                                                    Floor outlet fixtures, drain connections, 2.3.3.8.                      2.7.2.4.
                                                                                                    Flow control roof drains, 1.4.1.2. [A], 2.4.10.4.                 Indirectly connected, 1.4.1.2. [A], 2.3.3.11., 2.4.2.1.,
                                                                                                    Flushing devices, 2.2.10.8., 2.6.1.6.                                   2.4.5.1., 2.4.5.5.
                                                                                                    Fluxes, 2.2.9.2.                                                  Indirect service water heaters, 1.4.1.2. [A], 2.6.1.7.,
                                                                                                    Food preparation sinks, overflows, 2.2.2.4.                             2.6.1.12.
                                                                                                    Freezing                                                          Individual vents, 1.4.1.2. [A], 2.5.1.1., 2.5.8.2., 2.5.9.1.
                                                                                                       air admittance valves, 2.5.9.3.                                Inlets, fresh air, 1.4.1.2. [A], 2.5.1.1., 2.5.5.4.
                                                                                                       protection against, 2.3.5.3.                                   Inspection (see Testing)
                                                                                                       storm drainage systems, 2.4.5.2.                               Installation of fixtures
                                                                                                       test conditions, 2.3.7.1.                                         connections, 2.3.3.8., 2.4.2.1.
                                                                                                    Fresh air inlets, 1.4.1.2. [A], 2.5.1.1., 2.5.5.4., 2.5.6.5.         location, 2.1.3., 2.4.3., 2.5.3.1.
                                                                                                    Functional statements                                                protection with traps, 2.4.5.1.
                                                                                                       application, 3.1.1.2. [A]                                         provision for future, 2.5.5.5.
                                                                                                       attribution to acceptable solutions, 2.8.1.1.                     relief valves, 2.6.1.7.
                                                                                                       list of, 3.2.1.1. [A]                                             shut-off valves, 2.6.1.3.
                                                                                                                                                                         support of piping, 2.3.4.1., 2.3.4.2.
                                                                                                                                                                      Insulation, electrical, 2.3.4.3.
                                                                                                                                  G                                   Interceptors
                                                                                                                                                                         capacity, 2.4.4.3.
                                                                                                    Galvanized steel or iron pipe and fittings, 2.2.6.7.,                cleanouts, 2.4.7.1.
                                                                                                         2.3.3.3., 2.3.4.5.                                              definition, 1.4.1.2. [A]
                                                                                                    Garbage grinders, 2.4.3.3., 2.4.9.3.                                 design, 2.2.3.2.
                                                                                                    Grease interceptors (see Interceptors)                               drum traps serving as, 2.2.3.1.
                                                                                                    Groove and shoulder mechanical couplings, 2.2.10.4.,                 gasoline, 2.4.4.3.
                                                                                                         2.3.2.6.                                                        grease, 2.2.3.2., 2.4.4.3.
                                                                                                    Gutters, roof, 1.4.1.2. [A], 2.4.10.10.                              location, 2.1.3.2.
                                                                                                                                                                         oil, 2.4.4.3., 2.5.5.2.
                                                                                                                                                                         replacing traps, 2.4.5.1.
                                                                                                                                  H                                      restrictions on use, 2.4.3.3.
                                                                                                                                                                         sand or grit, 2.4.4.3.
                                                                                                    Hangers, pipe, 2.3.4.3., 2.3.4.5., 2.3.4.6.                          venting, 2.5.5.2.
                                                                                                    Healthcare facilities, 2.2.10.6., 2.2.10.7., 2.4.7.4., 2.7.1.1.      where required, 2.4.4.3.
                                                                                                    Horizontal offsets, 1.4.1.2. [A], 2.4.2.1., 2.4.9.5.,
                                                                                                         2.4.10.6., 2.5.2.1., 2.5.4.4.
                                                                                                    Horizontal piping, support, 2.3.4.5., 2.3.4.6.                                                  J
                                                                                                    Hose bibbs, 2.6.2.7., 2.6.3.2.
                                                                                                    Hot water systems, 2.2.5.7., 2.2.5.12., 2.2.10.7.,                Jointing materials, 2.2.9.
                                                                                                         2.2.10.13., 2.4.4.2., 2.6.1.1., 2.6.1.8.                     Joints, pipe, 2.2.1.5., 2.2.5.2., 2.2.5.3., 2.2.6.4., 2.3.2.,
                                                                                                    Hot water waste, cooling of, 2.4.4.2.                                   2.3.3.


                                                                                                    National Plumbing Code of Canada 2020                                                                                        Index
                                                                                                                                  L                                  Mechanical couplings, 2.2.10.4.
                                                                                                                                                                     Mechanical damage, protection against, 2.3.5.4.
                                                                                                    Laboratories                                                     Mechanical joints
                                                                                                       drainage systems, 2.2.8.1.                                      construction and use, 2.3.2.6., 2.3.3.6.
                                                                                                       hazardous waste cleanouts, 2.4.7.4.                             pipe couplings, 2.2.10.4.
                                                                                                       sizing of water distribution systems, 2.6.3.2.                Mobile homes
                                                                                                       traps for sinks, 2.4.5.1.                                       sewer service, 2.4.6.5.
                                                                                                    Laundry trays, 2.2.3.1., 2.4.5.1., 2.4.9.3., 2.7.2.2.              water service pipes, 2.6.1.10.
                                                                                                    Lavatories, 2.2.3.1., 2.2.10.6., 2.4.9.3., 2.6.3.2.              Moisture, protection against, 2.3.5.5.
                                                                                                    Lead content of solders and fluxes, 2.2.9.2.                     Mortar
                                                                                                    Leaders (downspouts)                                               cement, 2.2.9.1.
                                                                                                                                                                       cement lining, 2.2.6.4.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                       connections to roof drains, 2.3.3.7.
                                                                                                       definition, 1.4.1.2. [A]                                      Mortuaries
                                                                                                       external, exceptions to testing, 2.3.6.1., 2.3.6.2.             autopsy tables, 2.4.9.3.
                                                                                                       hydraulic loads, 2.4.10.11.                                     cleanouts, 2.4.7.4.
                                                                                                       internal, cleanouts, 2.4.7.1.
                                                                                                       internal, protection from condensation, 2.3.5.5.
                                                                                                       sheet metal, 2.2.6.9.                                                                    N
                                                                                                       size, 2.4.9.5.
                                                                                                       traps, 2.4.5.2.                                               Neutralizing tanks for corrosive or acid waste,
                                                                                                    Lead waste pipe and fittings, 2.2.7.8., 2.3.4.5.                      2.4.4.4., 2.5.5.3., 2.5.7.7.
                                                                                                    Lead water-closet bends, 2.2.7.8., 2.4.2.1.                      Nominally horizontal
                                                                                                    Lead water-closet stubs, 2.3.3.8.                                  definition, 1.4.1.2. [A]
                                                                                                    Lighting of rooms, 2.1.3.1.                                        offset, in stacks, 2.4.2.1., 2.4.10.6.
                                                                                                    Loads                                                              pipes, sizing of cleanouts, 2.4.7.2.
                                                                                                       hydraulic, 2.4.9.3., 2.4.10., 2.5.2.1., 2.5.3.1., 2.5.8.1.,     piping, 2.3.4.5., 2.3.4.6.
                                                                                                          2.5.8.3., 2.6.3.2., 2.6.3.4.                                 sanitary drainage pipes, 2.2.4.2., 2.4.2.1., 2.5.2.1.
                                                                                                       from walls, isolation of piping from, 2.3.5.2.                Nominally vertical
                                                                                                                                                                       definition, 1.4.1.2. [A]
                                                                                                                                                                       vent pipes, 2.5.6.2., 2.5.6.5.
                                                                                                                                 M                                   Noncombustible
                                                                                                                                                                       definition, 1.4.1.2. [A]
                                                                                                    Macerating toilet systems, 2.2.2.2., 2.4.3.5., 2.4.9.2.,           piping, 2.2.5.11.
                                                                                                         2.4.9.3., 2.5.7.7.                                          Non-ferrous pipe and fittings, 2.2.7.
                                                                                                    Maintenance holes (see Manholes)                                 Non-metallic pipe and fittings, 2.2.5.
                                                                                                    Malleable-iron water fittings, screwed, 2.2.6.6.                 Non-potable rainwater harvesting systems
                                                                                                    Manholes                                                           design, 2.7.2.4.
                                                                                                      cast-iron frames and covers for, 2.2.6.2.                        meaning of terms, 2.7.2.1.
                                                                                                      as cleanouts, 2.4.7.1., 2.4.7.3.                                 permitted applications, 2.7.2.2.
                                                                                                      concrete, 2.2.5.2.                                               protection of potable water system, 2.7.2.4.
                                                                                                      design, 2.4.7.3.                                                 roof surfaces and components, 2.7.2.3.
                                                                                                      vent pipes for, 2.5.7.6.                                         water collected, restrictions, 2.7.2.4.
                                                                                                    Manually operated valves, 2.2.10.6.                              Non-potable water systems
                                                                                                    Marking of pipes and fittings, 2.2.1.3., 2.7.1.2.                  connections to potable water systems, 2.6.2.1.,
                                                                                                    Materials and equipment                                               2.7.1.1.
                                                                                                      characteristics, 1.2.2.1. [A]                                    design, 2.7.1.1.
                                                                                                      corrosion-resistant, 2.2.8., 2.2.10.2.                           identification, 2.7.1.2.
                                                                                                      defects, 1.2.2.1. [A]                                            location of pipes and outlets, 2.7.1.3., 2.7.1.4.
                                                                                                      dissimilar, 2.3.3.6.                                             protection of public water system, 2.6.2.5.
                                                                                                      exposure, 2.2.1.1.                                               use, 2.7.1.1.
                                                                                                      fixtures, 2.2.2.                                               Nuts, 2.2.10.2., 2.2.10.3.
                                                                                                      identification, 2.2.1.3., 2.7.1.2.
                                                                                                      for jointing, 2.2.9.
                                                                                                      minimum pressure, 2.2.1.5.
                                                                                                      miscellaneous, 2.2.10.
                                                                                                                                                                                                O
                                                                                                      pipe fittings, 2.2.4.
                                                                                                      pipe and fittings, ferrous, 2.2.6.                             Objectives
                                                                                                      pipe and fittings, non-ferrous, 2.2.7.                           application, 2.1.1.2. [A]
                                                                                                      pipe and fittings, non-metallic, 2.2.5.                          attribution to acceptable solutions, 2.8.1.1.
                                                                                                      traps and interceptors, 2.2.3.                                   list of, 2.2.1.1. [A]
                                                                                                      used, 1.2.2.2. [A], 2.2.1.2.                                   Occupancy, 1.4.1.2. [A]


                                                                                                    Index                                                                                 National Plumbing Code of Canada 2020
                                                                                                    Offset relief vents                                                   non-metallic, 2.2.5.
                                                                                                      definition, 1.4.1.2. [A]                                            open ended, 2.4.6.1.
                                                                                                      for fixtures draining into vent pipes, 2.5.4.5.                     PE/AL/PE, 2.2.5.12., 2.3.4.5.
                                                                                                      protection of drainage system, 2.5.1.1.                             PEX/AL/PEX, 2.2.5.13., 2.3.4.5.
                                                                                                      sizing, 2.5.7.4., 2.5.8.5.                                          plastic, 2.2.5.9., 2.2.5.11., 2.3.3.8., 2.3.4.5.
                                                                                                      for stacks, 2.5.4.4.                                                polyethylene, 2.2.5.4., 2.2.5.5.
                                                                                                      for traps, 2.5.1.1.                                                 polypropylene, 2.2.5.14.
                                                                                                    Offsets (in piping)                                                   protection, 2.3.5., 2.6.1.4.
                                                                                                      definition, 1.4.1.2. [A]                                            PVC, 2.2.5.7., 2.3.4.5.
                                                                                                      leaders, 2.4.9.5.                                                   size, 2.4.9.
                                                                                                      stacks, 2.4.2.1., 2.4.10.6., 2.5.4.4.                               steel, 2.2.6.7., 2.2.6.8., 2.2.6.10., 2.2.6.15., 2.3.3.3.,
                                                                                                      wet vents, 2.5.2.1.                                                    2.3.4.5.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                    Oil interceptors (see Interceptors)                                   subsoil drainage, 2.4.5.3., 2.4.6.4.
                                                                                                    Organizations, 1.3.2., 1.5.2. [A]                                     underground, 2.3.4.6., 2.3.5.1.
                                                                                                    Outlets from non-potable water systems, 2.7.1.2.,                     vitrified clay, 2.2.5.3.
                                                                                                          2.7.1.4.                                                        water service, 1.4.1.2. [A], 2.2.1.6., 2.6.1.3., 2.6.1.5.,
                                                                                                    Overflows                                                                2.6.1.10., 2.6.3.4.
                                                                                                      rainwater storage tanks, 2.4.2.2.                                Pipe fittings (see Fittings)
                                                                                                      roof drain, control, 2.4.10.4.                                   Pipe flanges
                                                                                                      sinks, 2.2.2.4.                                                     brass or bronze, 2.2.7.2.
                                                                                                                                                                          stainless steel, 2.2.6.12.
                                                                                                                                                                       Piping
                                                                                                                                  P                                       combustible, 1.4.1.2. [A], 2.2.5.11.
                                                                                                                                                                          construction and use of joints, 2.3.2.
                                                                                                                                                                          contraction accommodation, 2.3.3.9.
                                                                                                    Paved surfaces, hydraulic loads, 2.4.10.1., 2.4.10.4.
                                                                                                    PE/AL/PE (polyethylene/aluminum/polyethylene)                         CPVC design temperature and pressure, 2.2.5.8.
                                                                                                                                                                          drainage, 2.4.6.
                                                                                                          pipe and fittings, 2.2.5.12., 2.3.4.5.
                                                                                                                                                                          expansion accommodation, 2.3.3.9.
                                                                                                    Permits, plumbing, 2.2.2.1. [C]
                                                                                                    Personal hygiene devices, 2.2.2.2.                                    horizontal, 2.3.4.5., 2.3.4.6.
                                                                                                                                                                          installation, 2.3.5.2.
                                                                                                    PE-RT (polyethylene of raised temperature) tube and
                                                                                                                                                                          joints and connections, 2.3.3.
                                                                                                          fittings, 2.2.5.15., 2.3.4.5.
                                                                                                    PEX/AL/PEX (crosslinked polyethylene/aluminum/                        minimum pressure, 2.2.1.5.
                                                                                                                                                                          noncombustible, 1.4.1.2. [A], 2.2.5.11.
                                                                                                          cross-linked polyethylene) composite pipe and
                                                                                                                                                                          protection, 2.3.5.
                                                                                                          fittings, 2.2.5.13., 2.3.4.5.
                                                                                                    Pipe                                                                  service, 2.1.2.4.
                                                                                                                                                                          support, 2.3.4.
                                                                                                       ABS, 2.2.5.9., 2.2.5.10., 2.3.4.5.
                                                                                                                                                                          vertical, 2.3.4.4.
                                                                                                       applications, summary, 2.2.5. - 2.2.8.
                                                                                                       bell and spigot, 2.3.2.7.                                       Plastic fixtures, 2.2.2.2.
                                                                                                                                                                       Plastic pipe and fittings, 2.2.5.9., 2.2.5.11.
                                                                                                       brass, 2.2.7.1., 2.2.7.2., 2.3.4.2., 2.3.4.5.
                                                                                                                                                                       Plumbing drawings and related documents,
                                                                                                       cast-iron, 2.2.6.1., 2.2.6.4., 2.3.3.3., 2.3.3.8., 2.3.4.5.
                                                                                                       cellular core PVC, 2.2.5.16.                                          2.2.2.1. [C]
                                                                                                                                                                       Plumbing facilities, 1.1.1.1. [A]
                                                                                                       combustible, 2.2.5.11.
                                                                                                                                                                       Plumbing permits, drawing requirements, 2.2.2.1. [C]
                                                                                                       concrete, 2.2.5.2.
                                                                                                       copper, 2.2.7.1., 2.3.2.1., 2.3.4.3., 2.3.4.5.                  Plumbing systems
                                                                                                                                                                          application of Code, 1.1.1.1. [A]
                                                                                                       corrosion-resistant, 2.2.8.
                                                                                                                                                                          definition, 1.4.1.2. [A]
                                                                                                       corrugated steel, 2.2.6.8.
                                                                                                       CPVC, 2.2.5.8., 2.3.4.5.                                        Polyethylene/aluminum/polyethylene (PE/AL/PE)
                                                                                                                                                                             pipe and fittings, 2.2.5.12., 2.3.4.5.
                                                                                                       crosslinked polyethylene, 2.2.5.6.
                                                                                                                                                                       Polyethylene pipe and fittings, 2.2.5.4., 2.2.5.5., 2.3.4.5.
                                                                                                       ductile-iron water, 2.2.6.4.
                                                                                                       ferrous, 2.2.6.                                                 Polyethylene water pipe, 2.2.5.4.
                                                                                                                                                                       Polypropylene pipe and fittings, 2.2.5.14., 2.3.4.5.
                                                                                                       fibrocement, 2.2.5.1.
                                                                                                                                                                       Polyvinyl chloride (PVC) pipe and fittings, 2.2.5.7.,
                                                                                                       hangers, 2.3.4.3., 2.3.4.5., 2.3.4.6.
                                                                                                       hub and spigot, 2.3.2.1.                                              2.3.4.5.
                                                                                                                                                                       Porcelain-enamelled fixtures, 2.2.2.2.
                                                                                                       hydraulic loads, 2.4.10.1.
                                                                                                                                                                       Potable, definition, 1.4.1.2. [A]
                                                                                                      joints and connections, 2.3.2., 2.3.3.
                                                                                                      lead, 2.2.7.8., 2.3.4.5.                                         Potable water systems (see also Water distribution
                                                                                                      leaders, 1.4.1.2. [A], 2.2.6.9., 2.3.5.5., 2.4.7.1., 2.4.9.5.,         systems; Water service pipes; Water systems;
                                                                                                                                                                             Water temperature control; Water treatment
                                                                                                          2.4.10.11.
                                                                                                       marking, 2.2.1.3., 2.7.1.2.                                           devices)
                                                                                                                                                                          arrangement of piping, 2.4.6.2., 2.6.1.
                                                                                                       noncombustible, 2.2.5.11.
                                                                                                                                                                          cleaning before use, 2.6.2.8.
                                                                                                       non-ferrous, 2.2.7.


                                                                                                    National Plumbing Code of Canada 2020                                                                                      Index
                                                                                                       connections, 2.1.2.3., 2.6.2.1., 2.7.1.1.                      Risers
                                                                                                       design, fabrication and installation, 2.6.1.1., 2.6.3.1.          definition, 1.4.1.2. [A]
                                                                                                       drainage, 2.6.1.2.                                                shut-off valves, 2.6.1.3.
                                                                                                       drawings for plumbing permit, 2.2.2.1. [C]                     Roof drains
                                                                                                       lead content, restrictions on use, 2.2.9.2.                       connections to leaders, 2.3.3.7.
                                                                                                       protection from contamination, 2.6.2., 2.7.2.4.                   definition, 1.4.1.2. [A]
                                                                                                       size and capacity of pipes, 2.6.3.                                flow control, 1.4.1.2. [A], 2.4.10.4.
                                                                                                       solar heating, 2.2.10.13., 2.6.1.8.                            Roof gutters, 1.4.1.2. [A], 2.4.10.10.
                                                                                                       testing, 2.3.7.                                                Roofs, hydraulic load from, 2.4.10.4.
                                                                                                    Potato peelers, 2.4.3.3., 2.4.9.3.                                Rubber gasket joints, 2.2.5.2., 2.2.6.4.
                                                                                                    Premise isolation, 2.6.2.6.
                                                                                                    Pressure (see also Back pressure)




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                       CPVC piping, 2.2.5.8.
                                                                                                       PE/AL/PE piping in hot water systems, 2.2.5.12.                                            S
                                                                                                       piping, fittings and joints, 2.2.1.5.
                                                                                                       PVC piping, 2.2.5.7.
                                                                                                                                                                      Saddle hubs or fittings, 2.2.10.5.
                                                                                                       static, at fixtures, 2.6.3.3., 2.7.1.1., 2.7.2.4.
                                                                                                                                                                      Sanitary building drains (see also Building drains)
                                                                                                       from suds, 2.4.2.1.
                                                                                                                                                                         definition, 1.4.1.2. [A]
                                                                                                       testing, 2.3.6.4., 2.3.7.
                                                                                                                                                                      Sanitary building sewers (see also Building sewers)
                                                                                                       water service pipe, 2.2.1.6., 2.6.3.4.
                                                                                                                                                                         definition, 1.4.1.2. [A]
                                                                                                    Pressure-reducing valves, 2.2.10.12., 2.6.1.11., 2.6.3.3.,
                                                                                                                                                                      Sanitary drainage pipes
                                                                                                          2.7.1.1., 2.7.2.4.
                                                                                                                                                                         connections, 2.4.2.1., 2.5.6.2.
                                                                                                    Pressure-relief valves, 2.2.10.11., 2.6.1.7.
                                                                                                                                                                         definition, 1.4.1.2. [A]
                                                                                                    Pressure vacuum breaker, 2.6.2.2., 2.6.2.10.
                                                                                                                                                                         drawings for plumbing permit, 2.2.2.1. [C]
                                                                                                    Private sewage disposal systems, 1.4.1.2. [A], 2.1.2.1.,
                                                                                                                                                                         hydraulic loads, 2.4.10.6.
                                                                                                          2.4.4.1.
                                                                                                                                                                         lead, 2.2.7.8., 2.3.4.5.
                                                                                                    Private use, 1.4.1.2. [A], 2.6.3.2., 2.6.3.4.
                                                                                                                                                                         location, 2.4.6.2.
                                                                                                    Private water supply system, 1.4.1.2. [A], 2.1.2.3.,
                                                                                                                                                                         restrictions on use, 2.4.6.1.
                                                                                                          2.6.2.5.
                                                                                                                                                                         sizing, 2.4.9.1.
                                                                                                    Protection of piping, 2.3.5.
                                                                                                                                                                         vents, serving as, 2.5.2.1., 2.5.3.1., 2.5.7.3.
                                                                                                    Public use, 1.4.1.2. [A], 2.2.2.5., 2.6.3.2.
                                                                                                                                                                      Sanitary drainage systems, 1.4.1.2. [A], 2.4.4.1., 2.4.4.4.,
                                                                                                    Public washrooms, 2.2.2.5., 2.2.10.6.
                                                                                                                                                                            2.4.5.1., 2.4.7.1.
                                                                                                    Pumps for sumps, 2.4.6.3.
                                                                                                                                                                         connections, 2.1.2.1., 2.4.2.1., 2.4.5.3.
                                                                                                    PVC (polyvinyl chloride) pipe and fittings, 2.2.5.7.,
                                                                                                                                                                      Sanitary sewers, 1.4.1.2. [A], 2.1.2.1., 2.5.4.5.
                                                                                                          2.3.4.5.
                                                                                                                                                                      Sanitary T fittings, 2.2.4.2.
                                                                                                                                                                      Scope of Code, 1.3.1. [A]
                                                                                                                                 R                                    Screwed cast-iron water fittings, 2.2.6.5.
                                                                                                                                                                      Screwed joints, 2.3.2.3.
                                                                                                                                                                      Screwed malleable-iron water fittings, 2.2.6.6.
                                                                                                    Rainfall, and hydraulic load, 2.4.10.4.                           Screws, 2.2.10.2.
                                                                                                    Rainwater harvesting systems, 2.7.2.                              Service water heaters, 1.4.1.2. [A], 2.6.1.7., 2.6.1.12.
                                                                                                    Rainwater tanks, overflows, 2.4.2.2., 2.7.2.4.                    Sewage
                                                                                                    Receiving tanks, 2.4.6.3.                                            cooling of, 2.4.4.2.
                                                                                                    Reducer fittings, 2.3.3.5.                                           definition, 1.4.1.2. [A]
                                                                                                    Reducing valves, 2.2.10.12., 2.6.1.11.                               including corrosive or acid waste, 2.4.4.4., 2.5.5.3.
                                                                                                    Referenced documents, 1.3.1., 1.5.1. [A]                             including fats, oils or grease, 2.4.4.3.
                                                                                                    Relief valves, 2.2.10.11., 2.6.1.7.                                  including oil or gasoline, 2.4.4.3.
                                                                                                    Relief vents                                                         including sand or grit, 2.4.4.3.
                                                                                                      connections, 2.5.3.1., 2.5.6.4., 2.5.7.3.                          received by sumps or tanks, 2.4.6.3., 2.5.5.1., 2.5.8.5.
                                                                                                      definition, 1.4.1.2. [A]                                           treatment, 2.4.4.1.
                                                                                                      offset, 1.4.1.2. [A], 2.5.1.1., 2.5.4.4., 2.5.4.5., 2.5.7.4.,   Sewage disposal system, private, 1.4.1.2. [A], 2.1.2.1.,
                                                                                                          2.5.8.5.                                                          2.4.4.1.
                                                                                                      sizing, 2.5.7.3., 2.5.8.5.                                      Sewage sumps, venting, 2.5.5.1., 2.5.7.7.
                                                                                                      for traps, 2.5.1.1.                                             Sewers (see Building sewers)
                                                                                                    Residential full flow-through fire sprinkler/standpipe            Sheet metal leaders, 2.2.6.9.
                                                                                                          system, 1.4.1.2. [A], 2.6.2.4.                              Showers and shower heads
                                                                                                    Residential partial flow-through fire                                construction and arrangement, 2.2.2.3.
                                                                                                          sprinkler/standpipe system, 1.4.1.2. [A],                      hydraulic loads, 2.6.3.2.
                                                                                                          2.6.2.4.                                                       size of fixture outlet pipes, 2.4.9.3.
                                                                                                                                                                         sizing of water distribution systems, 2.6.3.2.
                                                                                                                                                                         temperature control, 2.2.10.7.


                                                                                                    Index                                                                                  National Plumbing Code of Canada 2020
                                                                                                       traps, 2.4.5.1.                                               Stop-and-waste cocks, 2.6.1.4.
                                                                                                       water flow rates, 2.2.10.6.                                   Storage-type service water heaters, 1.4.1.2. [A], 2.6.1.7.,
                                                                                                    Shut-off valves, 2.4.6.3., 2.6.1.3., 2.6.1.7.                          2.6.1.12.
                                                                                                    Sinks                                                            Storey, definition, 1.4.1.2. [A]
                                                                                                       dishwashing and food preparation, 2.2.2.4.                    Storm building drains (see also Building drains),
                                                                                                       floor-mounted service, 2.2.3.1.                                     1.4.1.2. [A], 2.4.5.2., 2.4.10.9.
                                                                                                       hot water temperature, 2.2.10.7.                              Storm building sewers (see also Building sewers),
                                                                                                       size of outlet pipes, 2.4.9.3.                                      1.4.1.2. [A], 2.4.5.2., 2.4.10.9.
                                                                                                       sizing of water distribution systems, 2.6.3.2.                Storm drainage systems
                                                                                                       traps, 2.2.3.1., 2.4.5.1.                                        cleanouts, 2.4.7.1.
                                                                                                    Size                                                                connections, 2.1.2.2., 2.4.2.1.
                                                                                                       ball, for test, 2.3.6.7.                                         definition, 1.4.1.2. [A]




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                       building drains, 2.4.9.4.                                        location, 2.4.5.2.
                                                                                                       building sewers, 2.4.9.4.                                        traps, 2.4.5.2.
                                                                                                       cleanouts, 2.4.7.2.                                           Storm sewers, 1.4.1.2. [A], 2.1.2.2., 2.4.10.13.
                                                                                                       definition, 1.4.1.2. [A]                                      Storm water, 1.4.1.2. [A], 2.1.2.2., 2.4.2.1., 2.4.6.1.,
                                                                                                       drainage pipes, 2.4.9.                                              2.5.6.5., 2.7.2.
                                                                                                       fixture outlet pipes, 2.4.8.2., 2.4.9.3.                      Stubs, lead, water closet, 2.3.3.8., 2.4.2.1.
                                                                                                       leaders, 2.4.9.5.                                             Subsoil drainage pipes
                                                                                                       traps and trap arms, 2.5.1.1., 2.5.6.3.                          connections, 2.4.5.3., 2.4.6.4.
                                                                                                       vent pipes, 2.5.4.4., 2.5.5.2., 2.5.7., 2.5.8.                   definition, 1.4.1.2. [A]
                                                                                                       water distribution systems, 2.6.3.2.                             sumps, 2.4.6.3.
                                                                                                       water service pipes, 2.6.3.4.                                 Suds pressure zones, 2.4.2.1.
                                                                                                       water supply pipes, 2.6.1.7., 2.6.3.                          Suites, 1.4.1.2. [A], 2.6.1.3.
                                                                                                    Slip joints, 2.3.3.4.                                            Sumps
                                                                                                    Slope of drainage pipes, 2.4.8.1.                                   arrangement of drainage piping, 2.4.6.3.
                                                                                                    Soil pipe, cast-iron, 2.2.6.1., 2.3.3.3., 2.3.4.5.                  elevator pits, 2.4.3.6.
                                                                                                    Solar domestic hot water systems, 2.2.10.13., 2.6.1.8.              venting, 2.5.5.1., 2.5.7.7.
                                                                                                    Soldered joints, 2.2.9.2., 2.3.2.4.                              Supply and waste fittings, 2.2.10.6.
                                                                                                    Solder-joint fittings, 2.2.7.5., 2.2.7.6., 2.2.9.2.              Supports for piping, 2.3.4.
                                                                                                    Solders, 2.2.9.2.                                                Symbols, 1.4.2.1. [A]
                                                                                                    Solvent cement, 2.2.5.7., 2.2.5.9. - 2.2.5.11.                   Systems, characteristics, 1.2.2.1. [A]
                                                                                                    Sprinkler/standpipe systems, 1.4.1.2. [A], 2.6.2.4.,
                                                                                                          2.6.3.1.
                                                                                                    Stacks
                                                                                                       cleanouts, 2.4.7.1.
                                                                                                                                                                                                   T
                                                                                                       connections, 2.4.2.1., 2.5.4.2., 2.5.4.3.
                                                                                                       definition, 1.4.1.2. [A]                                      Tanks (drainage), 2.4.6.3.
                                                                                                       hydraulic loads, 2.4.10.6.                                    Tank-type water closets, 2.6.2.11.
                                                                                                       size, 2.4.9.2.                                                Tee joints, extracted, 2.3.3.2.
                                                                                                       vent pipes, 2.5.4.                                            Temperature controls, 2.2.10.7., 2.6.1.7., 2.6.1.12.
                                                                                                    Stack vents                                                      Temperature-relief valves
                                                                                                       definition, 1.4.1.2. [A]                                         specifications, 2.2.10.11.
                                                                                                       length, 2.5.8.4.                                                 where required, 2.6.1.7.
                                                                                                       protection of drainage systems, 2.5.1.1.                      Terminals, vent pipes, 2.5.6.5., 2.5.9.1.
                                                                                                       size, 2.5.7.2., 2.5.8.4.                                      Testing
                                                                                                       for stacks, 2.5.4.1.                                             drainage and venting systems, 2.3.6.
                                                                                                    Stainless steel butt weld pipe fittings, 2.2.6.11.                  in freezing conditions, 2.3.7.1.
                                                                                                    Stainless steel fixtures, 2.2.2.2.                                  potable water systems, 2.3.7.
                                                                                                    Stainless steel pipe, 2.2.6.10., 2.2.6.15., 2.3.4.3., 2.3.4.5.   T fittings, 2.2.4.1., 2.2.4.2.
                                                                                                    Stainless steel pipe flanges, 2.2.6.12.                          Thermal expansion of piping, 2.3.3.9., 2.6.1.11.
                                                                                                    Stainless steel threaded fittings, 2.2.6.13.                     Threaded cast-iron drainage fittings, 2.2.6.3.
                                                                                                    Stainless steel tube, 2.2.6.14., 2.2.6.15., 2.3.4.5.             Transition solvent cement, 2.2.5.10.
                                                                                                    Stainless steel welded joints, 2.3.2.8.                          Trap arms, 1.4.1.2. [A], 2.3.4.5., 2.5.2.1., 2.5.4.5., 2.5.6.3.
                                                                                                    Standpipe system, 2.6.2.4.                                       Trap dips, 1.4.1.2. [A], 2.4.7.1.
                                                                                                    Static pressure, 2.6.3.3., 2.7.1.1., 2.7.2.4.                    Traps
                                                                                                    Steel pipe                                                          bell, 2.2.3.1.
                                                                                                       corrugated, 2.2.6.8.                                             cleanouts, 2.2.3.1., 2.4.5.4., 2.4.7.1.
                                                                                                       galvanized, 2.2.6.7., 2.3.3.3., 2.3.4.5.                         connections, 2.2.3.1.
                                                                                                       stainless, 2.2.6.10., 2.2.6.15., 2.3.4.5.                        definition, 1.4.1.2. [A]
                                                                                                       welded and seamless, 2.2.6.7.                                    design, 2.2.3.1.


                                                                                                    National Plumbing Code of Canada 2020                                                                                       Index
                                                                                                       drawings for plumbing permit, 2.2.2.1. [C]                    backwater, 1.4.1.2. [A], 2.4.2.1., 2.4.3.6., 2.4.6.3.,
                                                                                                       drum, 2.2.3.1.                                                   2.4.6.4., 2.7.2.4.
                                                                                                       for fixtures, 2.4.5.1.                                        check, 1.4.1.2. [A], 2.4.2.1., 2.4.6.3., 2.6.1.5., 2.6.1.11.,
                                                                                                       for floor drains, 2.4.5.2.                                       2.6.2.2. - 2.6.2.4.
                                                                                                       interceptors, used as, 2.2.3.1., 2.4.5.1.                     direct flush, 2.2.10.8., 2.4.9.3.
                                                                                                       location, 2.4.5.2., 2.4.5.4.                                  manually operated, 2.2.10.6.
                                                                                                       materials, 2.2.3.1.                                           pressure-reducing, 2.6.1.11., 2.6.3.3., 2.7.1.1., 2.7.2.4.
                                                                                                       restricted locations, 2.4.3.2.                                pressure-relief, 2.2.10.11., 2.6.1.7.
                                                                                                       for sanitary drainage systems, 2.4.4.4., 2.4.5.1.             reducing, 2.2.10.12.
                                                                                                       seals, 2.4.5.5.                                               shut-off, 2.4.6.3., 2.6.1.3., 2.6.1.7.
                                                                                                       size, 2.4.10.2., 2.4.10.12., 2.5.7.1.                         temperature-relief, 2.2.10.11., 2.6.1.7.
                                                                                                       for storm drainage systems, 2.4.5.2.                          vacuum-relief, 2.2.10.11., 2.6.1.7.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                       for subsoil drains, 2.4.5.3.                                Velocity, water service pipes, 2.6.3.5.
                                                                                                       tubular, 2.2.3.3.                                           Vent headers, 1.4.1.2. [A], 2.5.1.1., 2.5.7.2., 2.5.8.3.
                                                                                                       venting, 2.5.1., 2.5.6.3.                                   Ventilation of rooms, 2.1.3.1.
                                                                                                    Trap seal depth, 1.4.1.2. [A], 2.2.3.1.                        Venting
                                                                                                    Trap seals                                                       circuit, 2.5.3.
                                                                                                       maintaining, 2.4.5.5.                                         corrosive drain piping, 2.5.5.3.
                                                                                                       size, 2.2.3.1.                                                dilution tanks, 2.5.5.3., 2.5.7.7.
                                                                                                    Trap standards                                                   floor drains, 2.5.1.1.
                                                                                                       definition, 1.4.1.2. [A]                                      interceptors, 2.5.5.2.
                                                                                                       installation, 2.3.2.1., 2.3.3.8.                              neutralizing tanks, 2.5.5.3., 2.5.7.7.
                                                                                                       trap arms, 2.5.6.3.                                           sewage sumps, 2.5.5.1.
                                                                                                    Trap weirs, 1.4.1.2. [A], 2.3.3.4., 2.4.9.3.                     wet, 2.5.2., 2.5.8.1.
                                                                                                    Treatment of sewage and wastes, 2.4.4.                         Venting systems
                                                                                                    Trenchless technology, 2.2.5.5.                                  definition, 1.4.1.2. [A]
                                                                                                    Tube                                                             design and installation, 2.5.
                                                                                                       copper, 2.2.7.4., 2.3.3.2., 2.3.3.10., 2.3.4.3., 2.3.4.5.     piping and materials, 2.2.4. - 2.2.6., 2.2.7.4., 2.2.8.1.,
                                                                                                       PE-RT, 2.2.5.15., 2.3.4.5.                                       2.2.10., 2.3.2.1., 2.3.2.7., 2.3.3.4.
                                                                                                       stainless steel, 2.2.6.14., 2.2.6.15., 2.3.4.5.               provision for future installation, 2.5.5.5.
                                                                                                    Tubing (see Piping)                                              testing, 2.3.6.
                                                                                                                                                                   Vent pipes
                                                                                                                                                                     arrangement, 2.5.6.
                                                                                                                                 U                                   cast-iron, 2.2.6.1.
                                                                                                                                                                     connections, 2.5.6.2.
                                                                                                                                                                     definition, 1.4.1.2. [A]
                                                                                                    Underground pipes                                                for dilution tanks, 2.5.5.3., 2.5.7.7.
                                                                                                      copper joints, 2.3.3.12.                                       drainage, 2.5.6.1.
                                                                                                      protection, 2.3.5.1.                                           drawings for plumbing permit, 2.2.2.1. [C]
                                                                                                      support, 2.3.4.6.                                              flashing, 2.2.10.14.
                                                                                                    Unions, 2.3.3.4., 2.4.6.3.                                       location, 2.5.6.3.
                                                                                                    Urinals                                                          for macerating toilets, 2.5.7.7.
                                                                                                      connections, 2.3.3.8.                                          for manholes, 2.5.7.6.
                                                                                                      flushing devices, 2.6.1.6.                                     miscellaneous, 2.5.5.
                                                                                                      hydraulic loads, 2.6.3.2.                                      neutralizing tanks, 2.5.5.3., 2.5.7.7.
                                                                                                      location, 2.4.3.1.                                             for sewage sumps, 2.5.7.7.
                                                                                                      size of fixture outlet pipes, 2.4.9.3.                         sizing, 2.5.7., 2.5.8.
                                                                                                    Used materials and equipment, 1.2.2.2. [A], 2.2.1.2.             for stacks, 2.5.4.
                                                                                                                                                                     suds pressure zones, 2.4.2.1.
                                                                                                                                                                     support above roof, 2.3.4.7.
                                                                                                                                 V                                   terminals, 2.5.6.5.
                                                                                                                                                                     for traps, 2.5.1.
                                                                                                    Vacuum breakers (see also Back-siphonage                       Vents
                                                                                                                                                                     additional circuit, 1.4.1.2. [A], 2.5.1.1., 2.5.3.1.,
                                                                                                         preventers), 2.2.10.8., 2.6.2.2., 2.6.2.10.
                                                                                                                                                                        2.5.4.5., 2.5.7.3., 2.5.8.5.
                                                                                                    Vacuum-relief valves, 2.2.10.11., 2.6.1.7.
                                                                                                    Valves                                                           branch, 1.4.1.2. [A], 2.5.1.1., 2.5.7.2., 2.5.8.3.
                                                                                                                                                                     circuit, 1.4.1.2. [A], 2.5.1.1., 2.5.3.1., 2.5.4.5., 2.5.7.3.,
                                                                                                      accessibility, 2.1.3.2.
                                                                                                                                                                        2.5.8.3.
                                                                                                      air admittance, 1.4.1.2. [A], 2.2.10.16., 2.5.9.
                                                                                                      automatic compensating, 2.2.10.6., 2.2.10.7.                   continuous, 1.4.1.2. [A], 2.5.1.1., 2.5.2.1., 2.5.8.3.
                                                                                                                                                                     dual, 1.4.1.2. [A], 2.5.1.1., 2.5.8.2., 2.5.9.1.
                                                                                                      backflow preventers, 1.4.1.2. [A], 2.2.10.10., 2.6.1.11.,
                                                                                                         2.6.2.1., 2.6.2.2., 2.6.2.12., 2.7.2.4.


                                                                                                    Index                                                                                 National Plumbing Code of Canada 2020
                                                                                                       individual, 1.4.1.2. [A], 2.5.1.1., 2.5.8.2., 2.5.8.3.,           velocity, 2.6.3.5.
                                                                                                          2.5.9.1.                                                       working pressure, 2.2.1.6.
                                                                                                       offset relief, 1.4.1.2. [A], 2.5.1.1., 2.5.4.4., 2.5.4.5.,      Water supply
                                                                                                          2.5.7.4., 2.5.8.5.                                             auxiliary, 1.4.1.2. [A]
                                                                                                       relief, 1.4.1.2. [A], 2.5.1.1., 2.5.3.1., 2.5.6.4., 2.5.7.3.,     design, fabrication and installation, 2.6.3.1.
                                                                                                          2.5.8.5.                                                       private, 1.4.1.2. [A], 2.6.2.5.
                                                                                                       stack, 1.4.1.2. [A], 2.5.1.1., 2.5.4.1., 2.5.7.2., 2.5.8.4.       protection, 2.6.1.4.
                                                                                                       wet, 1.4.1.2. [A], 2.5.1.1., 2.5.2.1., 2.5.8.1.                   separation of public and private systems, 2.6.2.5.
                                                                                                       yoke, 1.4.1.2. [A], 2.5.1.1., 2.5.4.3., 2.5.4.5., 2.5.7.5.,     Water systems (see also Non-potable water systems)
                                                                                                          2.5.8.5.                                                       definition, 1.4.1.2. [A]
                                                                                                    Vent stacks                                                        Water temperature control, 2.2.10.7.
                                                                                                       definition, 1.4.1.2. [A]                                        Water treatment devices, 2.2.10.17., 2.6.2.1.




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                       sizing, 2.5.7.2., 2.5.8.4.                                      Water usage per flush cycle, 2.6.1.6.
                                                                                                       for stacks, 2.5.4.2.                                            Welded joints
                                                                                                       for traps, 2.5.1.                                                 restrictions on use, 2.3.3.3.
                                                                                                    Vertical piping, support, 2.3.4.4.                                   stainless steel, 2.3.2.8.
                                                                                                    Vitreous china fixtures, 2.2.2.2.                                  Welded and seamless steel pipe, 2.2.6.7.
                                                                                                    Vitrified clay pipe and fittings, 2.2.5.3.                         Wet venting, 2.5.2., 2.5.8.1.
                                                                                                                                                                       Wet vents, 1.4.1.2. [A], 2.5.1.1., 2.5.2.1., 2.5.8.1.
                                                                                                                                                                       Wiped joints, 2.3.2.2.
                                                                                                                                  W
                                                                                                    Washers, 2.2.10.2., 2.4.9.3., 2.6.3.2., 2.7.2.2.                                               Y
                                                                                                    Washing machines, 2.4.5.1., 2.4.9.3., 2.6.3.2.
                                                                                                    Waste, cooling, 2.4.4.2.                                           Yoke vents
                                                                                                    Waste pipes (see Sanitary drainage pipes)                            definition, 1.4.1.2. [A]
                                                                                                    Water closets                                                        for fixtures draining into vent pipes, 2.5.4.5.
                                                                                                      connections, 2.3.3.8.                                              sizing, 2.5.7.5., 2.5.8.5.
                                                                                                      flushing devices, 2.6.1.6.                                         for stacks, 2.5.4.3.
                                                                                                      hydraulic loads, 2.6.3.2.                                          for traps, 2.5.1.1.
                                                                                                      in public washrooms, 2.2.2.5.
                                                                                                      screws, bolts, nuts and washers, 2.2.10.2.
                                                                                                      size of pipes serving, 2.4.9.2., 2.4.9.3.                                                    Z
                                                                                                      tank-type, 2.2.10.10., 2.6.2.11.
                                                                                                      trap arms, 2.5.6.3.                                              Zinc, alloyed, 1.4.1.2. [A], 2.2.10.14.
                                                                                                    Water coolers, 2.6.3.2.
                                                                                                    Water distribution systems
                                                                                                      connection, 2.1.2.3.
                                                                                                      definition, 1.4.1.2. [A]
                                                                                                      design and installation, 2.6.1.1., 2.6.1.2.
                                                                                                      materials, 2.2.6.7., 2.2.6.15., 2.2.7.4.
                                                                                                      protection, 2.6.1.9.
                                                                                                    Water flow rates, 2.2.10.6.
                                                                                                    Water hammer arresters, 2.2.10.15.
                                                                                                    Water hammer, prevention, 2.6.1.9.
                                                                                                    Water heaters
                                                                                                      indirect service, 1.4.1.2. [A]
                                                                                                      pressure-relief valve, 2.6.1.7.
                                                                                                      storage-type, 1.4.1.2. [A]
                                                                                                      temperature controls, 2.6.1.7., 2.6.1.12.
                                                                                                    Water pipes
                                                                                                      cast-iron, 2.2.6.4.
                                                                                                      CPVC, 2.2.5.8.
                                                                                                      polyethylene, 2.2.5.4.
                                                                                                      PVC, 2.2.5.7.
                                                                                                      size and capacity, 2.6.3.
                                                                                                    Water pressure tests, 2.3.6.1. - 2.3.6.4., 2.3.7.1. - 2.3.7.3.
                                                                                                    Water service pipes
                                                                                                      definition, 1.4.1.2. [A]
                                                                                                      mobile home, 2.6.1.10.
                                                                                                      sizing, 2.6.3.4.


                                                                                                    National Plumbing Code of Canada 2020                                                                                  Index
                                                                                                                                                            Symbols and Abbreviations

                                                                                                    The following symbols and abbreviations are used in the figures:
                                                                                                    Water and drainage pipe _________
                                                                                                    Subsoil drains __ _ __ _

                                                                                                    Vent pipe _ _ _ _ _ _ _ _




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                                    BG              Bathroom group                                      KS     Kitchen sink
                                                                                                                    BT              Bathtub                                             LAV    Lavatory
                                                                                                                    CO              Cleanout                                            LT     Laundry tray
                                                                                                                    CW              Clothes washer                                      RD     Roof drain
                                                                                                                    DF              Drinking fountain                                   SHWR   Shower
                                                                                                                    DW              Dishwasher                                          SS     Slop sink
                                                                                                                    FD              Floor drain                                         SWH    Service water heater
                                                                                                                    FS              Floor sink                                          UR     Urinals
                                                                                                                    HB              Hose bibb                                           WC     Water closet


                                                                                                                                                                 Conversion Factors

                                                                                                                    To Convert                                         To                                      Multiply by
                                                                                                                    °C                                                 °F                                   1.8 and add 32
                                                                                                                    kg                                                 lb.                                            2.205
                                                                                                                    kg/m3                                              lbf/ft.3                                   0.06243
                                                                                                                    kN                                                 lb.                                         224.81
                                                                                                                    kN/m                                               lbf/ft.                                        68.52
                                                                                                                    kN/m3                                              lbf/ft.3                                       6.360
                                                                                                                    kPa                                                lbf/in.2 (psi)                              0.1450
                                                                                                                    kPa                                                lbf/ft.2                                       20.88
                                                                                                                    L                                                  gal. (imp.)                                 0.2200
                                                                                                                    L/s                                                gal./min (gpm)                                 13.20
                                                                                                                    m                                                  ft.                                            3.281
                                                                                                                    m2                                                 ft.2                                           10.76
                                                                                                                    mm                                                 in.                                        0.03937
                                                                                                                    m/s2                                               ft./s2                                         3.281
                                                                                                               Nominal Pipe Size (NPS) to Diameter Nominal (DN)
                                                                                                                               Conversion Chart

                                                                                                    NPS, in.                                                      DN, mm
                                                                                                     /8
                                                                                                     1
                                                                                                                                                                    6
                                                                                                     ¼                                                              8
                                                                                                     /8
                                                                                                     3
                                                                                                                                                                   10
                                                                                                     ½                                                             15




Copyright © NRC 1941 - 2022 World Rights Reserved © CNRC 1941-2022 Droits réservés pour tous pays
                                                                                                     ¾                                                             20
                                                                                                     1                                                             25
                                                                                                    1¼                                                             32
                                                                                                    1½                                                             38
                                                                                                     2                                                             50
                                                                                                    2½                                                             65
                                                                                                     3                                                             75
                                                                                                     4                                                            100
                                                                                                     5                                                            125
                                                                                                     6                                                            150
                                                                                                     8                                                            200
                                                                                                    10                                                            250
                                                                                                    12                                                            300
                                                                                                    14                                                            350
                                                                                                    16                                                            400
                                                                                                    18                                                            450
                                                                                                    20                                                            500
                                                                                                    22                                                            550
                                                                                                    24                                                            600
