Main drain degree of drop

jjonsqd13 · #1 Dec 5, 2007, 06:59 PM

I'm finishing my basement and the main drain pipe is in a very bad spot. I'm going to re-run the main drain. How much of a drop should the pipe be? (Example: 1" every 10')

doug238 · Dec 5, 2007, 07:56 PM

2" pipe and under must have a minimum fall of 1/4" per foot equalling 1" every 4 feet and larger than 2" pipe must have a minimum of 1/8" per foot equalling 1" every 8 feet for residential drain and sewer piping.



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