Page 709 - 2018_IRC

TRAPS

3. Connection of a laundry tray waste line into a stand-
pipe for the automatic clothes-washer drain shall be
permitted in accordance with Section P2706.1.2.1.
P3201.7 Size of fixture traps. Trap sizes for plumbing fix-
tures shall be as indicated in Table P3201.7. Where the tail-
piece of a plumbing fixture is larger than that indicated in
Table P3201.7, the trap size shall be the same nominal size as
the fixture tailpiece. A trap shall not be larger than the drain-
age pipe into which the trap discharges.
TABLE P3201.7
SIZE OF TRAPS FOR PLUMBING FIXTURES
TRAP SIZE
PLUMBING FIXTURE MINIMUM
(inches)
Bathtub (with or without shower head and/or 1 /
1
whirlpool attachments) 2
1
Bide 1 / 4
Clothes washer standpipe 2
1
Dishwasher (on separate trap) 1 / 2
Floor drain 2
Kitchen sink (one or two traps, with or
1
without dishwasher and food waste disposer) 1 / 2
1
Laundry tub (one or more compartments) 1 / 2
1
Lavato 1 / 4
Shower (based on the total flow rate through
showerheads and bodysprays)
Flow rate:
1
5.7 gpm and less 1 / 2
More than 5.7 gpm up to 12.3 gpm 2
More than 12.3 gpm up to 25.8 gpm 3
More than 25.8 gpm up to 55.6 gpm 4
For SI: 1 inch = 25.4 mm, 1 gallon per minute = 3.785 L/m.

684 2018 INTERNATIONAL RESIDENTIAL CODE ®
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