KMAC Engineering
N.Y.S. Licensed Professional Engineer
(K. Alfred Chu, PE)






National Plumbing Codes


Fixture-Unit Ratings in NY Area:

Fixture Rating
Bathtub 2
Shower 2
Residential toilet 4
Lavatory 1
Kitchen sink 2
Dishwasher 2
Clothes washer 3
Laundry tub 2




Minimum Drainage-Pipe Pitch in NY Area:

Pipe diamter(in) Pitch(in/ft)
Under 3 1/4
3-61/8
8 or larger 1/16




Stacking-Sizing Table for NY Area:

Pipe size(in) Fixture-unit discharge on stack from a branch Total fixture units allowed on stack
1.5 2 4
26 10
320*48*
490240

*No more than two toilets may be placed on a 3-in branch, and no more than six toilets may be connected to a 3-in stack.



Fixture Spacing:

15 inches between the sink and the toilet.

18 inches between the toilet and the tub.






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