I don't know what code your using but everyone I ever used had an 11/2" tub waste not 11/4
Drainage is by fixture units = 7.48 gallon =1 cubic foot Or 1 (one) GPM from a pump discharge
When your talking tub such as a bath you set it level and even if you did want to pitch the tub and gave it a full 1" per ft or 3" feet per foot the 11/2 drain could only carry so much water. (volume)
You can go as little as 1/16 per foot pitch BUT the pipe diameter has to be a minimum of 8" and your only going to
be allowed 1140 FU as opposed to 2300 if you used 1/2" pitch |
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