TOP 10 PLUMBING DEFECTS


 1       LOCATION OF CLEAN OUTS

 59 DEFECTS FOR CLEAN OUT REQUIRED

 •   20 on branch line
 •   17 on stack
 •   12 on building drain
 •   10 building drain change of direction > 135 degrees




 2       EXPANSION JOINTS

 58 - EXPANSION JOINT REQUIRED




 3       PROTECTION OF PIPING

 51 - STRIKER PLATES REQUIRED
4       WET VENTING ISSUES
                                                                  basin
                                                                                     vent


                                                                                                    slope
47 IMPROPER WET VENTING

•   29 - undersized wet vent
                                                                                                            stack
•   18 - wet vented ﬁxture downstream of a           toilet                                                 vent
    water closet

                                                                                                 use table
                                                                                                 2.5.8.1



                                                               slope 1/4” per ft.




5       PROTECTION OF POTABLE WATER

43 – HOSE BIBB VACUUM BREAKER REQUIRED




6       VENT CONNECTIONS
                                                                                            horizontal
                                                                                            vent pipe

43 DEFECTS FOR VENT CONNECTIONS

•   32 – vent not tied in above              basin
    ﬂood level
•   11 – vent not taken oﬀ above                                          flood rim level
    center line of drain
                                                              vertical
                                                              vent pipe
7       TRAP ARM ISSUES
                                                       No wyes or combos
40 TRAP ARM DEFECTS

•   23 – fall exceed pipe diameter
                                                                                           Weir
•   11 – length of trap arm is less than 2 times
    diameter of the ﬁxture drain                                 Trap arm length, see T9
•   6 - greater than 135 degrees change of direction




8       SUPPORT REQUIRED

33 DEFECTS FOR INADEQUATE SUPPORT OF PIPING,
APPARATUS, OR EQUIPMENT

•   22 - support of DWV piping
•   8 - support water piping or equipment
•   3 – support of pump discharge piping




9       UNVENTED FLOOR DRAINS

28 – FALL EXCEEDS PIPE DIAMETER OR LESS THEN 18 INCHES




10      BACK FLOW PROTECTION

16 – BACKWATER VALVE REQUIRED ON BRANCH LINE
