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View Full Version : Minimum floor drain slope


Nimot
Jan 11, 2011, 01:28 AM
What is the miminum slope required for floor drain pipes diameter of 16,12 and 10mm to be self cleasing?

massplumber2008
Jan 11, 2011, 06:12 AM
Hi Nimot...

Floor drains are not run in pipes that small (16 mm = 0.63 inches). Heck, most water pipes aren't even run that small... ;)

Most plumbing codes that I know of require a minimum pipe size of 2" (50.8mm) for a floor drain with a slope of 1/4" (6.35mm) per foot of piping and a vent within 5 feet of the floor drain for the floor drain to be considered part of a "self-cleansing" drain system.

A 3" (76.2mm) floor drain would have the same pitch as above.

a 4" (101.6mm) floor drain would only require 1/8" (3.175mm) per foot of piping.

Anything larger only requires the 1/8" pitch per foot.

Why exactly are you asking about such small pipe sizes? Let me know, OK?

Mark