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what drop do i need on long waste run ?

Postby czimmerl » Sat Sep 19, 2009 2:40 pm

Hi i am putting an ensuite in, i intend to drop the waste through the floor and create a false ceiling in the corridor below that runs the length of the house. The ensuite will be at the front of the house and mains waste is at the back. The total run is 46ft or 12 meters.
Q1) how much drop over that distance do i need ?
Q2) and/or what is the calculation ?
Many thanks
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Simply Build It

Postby plumbbob » Sat Sep 19, 2009 10:45 pm

The minimum fall for all internal waste pipes is 18mm per metre.

You must consider the diameter of pipe as this will be critical over this distance.

What were you thinking of using?
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