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Thread: reccomended sanitary drain grade (rise/run)

  1. #1

    Question reccomended sanitary drain grade (rise/run)

    I am installing two drains into a 3" stack that is outside my house. The first is a shower drain with 2" ABS, the second drain is the tub with 1.5" ABS. The tub drain is about 6 feet from the stack, while the shower is about 10 ft. My question, what is the reccomended grade for these types of drains? I have heard that 1/4" rise per foot run... but that seems pretty steep, and will mean I will lose more ceiling height. Please help, want to get the drains completed soon. Mike

  2. #2
    In the Trades Gary Swart's Avatar
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    Sep 2004
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    Yakima WA
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    7,246

    Default

    Minimum slope for all drains is 1/4" per foot. Even if you slipped a lessor grade past an inspector, you would be plagued with clogging problems forever. This is one of the problems a DIYer can run into after getting deep into a project. Sorry, but you can't ignore this one.

  3. #3

    Default Ok, good to know...

    Just wanted to make sure the numbers were right..

    Thanks

  4. #4
    Moderator & Master Plumber hj's Avatar
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    Aug 2004
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    Cave Creek, Arizona
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    25,679

    Default drains

    Now that you have the slope correct, what are you doing to provide vents for those drains? Installing a tub and shower involves more than just running a drain pipe from them and connecting it to the first available drain line.

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