What fall should I have on a 3mt run of soil stack

Hi Wbenton

Most plumbing codes want 1/4 inch pitch per foot of 3 inch or smaller pipe and 1/8 inch pitch per foot of 4 inch or larger pipe... ;)

With that being said, if your pipe is 3 inch or smaller and you want to run 3 METERS (or approx. 9 feet) of pipe you would pitch the pipe 2.5 inches total.

If your pipe is 4inch or larger you would pitch the pipe 1-1/8 inches.

Mark