Key to Code Check

Drains

Traps & Trap Arms
Vent opening not below weir of trap except toilet . . . . . . . .[trade] {1002.4}
Traps shall be plumb . . . . . . . . . . . . . . . . . . . . . . . . .[3201.3] {1005.0}
Trap & arm must be same size . . . . . . . . . . . . . . . . . [ 3201.7] {1003.3}
Fixture tailpiece max. 24in. . . . . . . . . . . . . . . . . . . . . .[3201.6] {1001.4}
Floor drain traps req. automatic primer . . . . . . . . . . . . [3201.2X] {1007.0}

Change of Direction
Vert. to horiz. or horiz. to horiz. through wye branches
or 45° wye branches or fittings of equal sweep . .F-p4 [3005.1] {706.3}
Double sanitary tee--two pipe sizes larger than inlets, horiz. to vert. .[ n/a] {706.2}

Back-to-Back Fixtures
Must use double fixture fitting . . . . . . . . . . . . . . .[3005.1.1] {704.2}

ABS/PVC
Draft stop around ceiling/wall penetrations . . . . . . . . .[602.8] {n/a}
Female threaded adapters must remain accessible . . . . .[n/a] {IS5-316.1}
Protect from nails . . . . . . . . . . . . . . . . . . . . . . . .[2603.2.1] {313.9}
No metal straps . . . . . . . . . . . . . . . . . . . . . . . . . . . . .[n/a] {IS5-314.1}
Solidly support every 4ft. . . . . . . . . . . . . . . . . .T-p3 [t2605.1] {T3-2}

Cleanouts
Location must remain accessible . . . . . . . . . . . . .[3005.2.5] {707.9}
<3in. {2in.} req's 12in. clearance; =>3in. {>2in.}
req's 18in. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .[3005.2.5] {707.10}
Req'd at upper terminal 1st floor runs & ea. 100ft. [3005.2.2] {707.4}
For each 45° {135°} change [only 1 per 40ft. req'd] [3005.2.4] {707.5}
All sinks at lowest floor level req. cleanout . . . . . . . . . . .[n/a] {707.4X1}
Underfloor cleanout not >20ft. from access door . . . . . .[n/a] {707.10}
Take off vertically above flow line except wye branch
or end of line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .[trade] {707.6}
Extend above floor or outdoors if access limited . . . . . . .[n/a] {707.10}

Cleanout Exceptions
Runs <5ft. (except sinks) . . . . . . . . . . . . . . . . . . . . . . .[n/a] {707.4ex.1}
Slope of 72° (5 bend) vert. offsets . . . . . . . . . . . . . . . .[n/a] {707.4ex.2}
Not req'd above first floor . . . . . . . . . . . . . . . . . . . . . .[n/a] {707.4ex.3}

Sizing Drains

Vents

General IRC UBC
Horiz. vent 6in. above fixture flood rim (except island sink or where structurally impossible) ........................................ . . . . . . . . . . . . . . . . [3104.4] {905.3}
Vent pipe below flood level rim must be drainage pattern (no horiz. san. tees) (may req. cleanouts) . ................................................ .F-p4 & F-p8 [3104.2] {905.3}
Takeoff above weir (toilet excepted) . . . . . . . . . . . .F-p8 [3105.2] {905.5}
No flat venting (takeoff above horiz. centerline) . . . . F-p3 [3104.3] {905.2}
Minimum one vent to exterior {all vents to exterior} . . . . [3114.7] {906.1}
{Aggregate vent area must be =>bldg. drain} . . . . . . . . . . . . [n/a] {904.1}

Heavy Snow and Frost
Min. 3in. {2in.} vent size above roof . . . . . . . . . . . . . . .[3103.2] {906.7}
Terminate min. 6in. above snowline {10in. above roof} . .[3103.1] {906.7}

Vent Termination
Roof--min. 6in. above {and 12in. to vert. surface} . . . . [3103.1] {906.1}
Clearance to building openings-2ft. {3ft.} above OR
10ft. horiz. [or 4ft. below] . . . . . . . . . . . . . . . . . .T-m2 [3103.5] {906.2}
Sidewall vent--min. 10ft. from PL and 10ft. above grade [3103.6] {Ø}

Air admittance valves
Min. 4in. above drain . . . . . . . . . . . . . . . . . . . . . .F-p6 [3114.4] {local}
Min. 6in. above insulation in attic . . . . . . . . . . . . . . . . .[3114.4] {local}
Must be accessible and open to air flow . . . . . . . . . . . .[3114.5] {local}

Wet Vents

May be horizontal or vertical . . . . . . . . . . . . . . . . .F-p8 [3108.1] {Ø}
Min. 12in. {2in.} . . . . . . . . . . . . . . . . . . . . . . . .F-p9 [T3108.3] {908.2}
Must be on the same floor {not longer than 6ft.} . . . . .[3108.1,4] {908.1}
Min. one pipe size larger than the req'd waste . . . . . . . . . .[n/a] {908.2}
Limited to traps of one and two fixture units . . . . . . . . . . . .[n/a] {908.1}
Not to serve as vent to more than four fixtures . . . . . . . . . [n/a] {908.1}