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Thread: Building drain support above grade

  1. #1
    DIY Junior Member mrd's Avatar
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    Default Building drain support above grade

    I have a 3in building drain running about 6in or so above grade in a tall crawlspace. The floor joists are 3-1/2 feet above the pipe. What's the best way to support the drain?

    I was considering using concrete blocks every 4', but I'm wondering if there's a chance the ground may settle. Plumbers tape hanging down 4' seems flimsy. Maybe tack a 2x4 vertically from the joists, with a strap at the end to the pipe..?

  2. #2
    Test, Don't Guess! cacher_chick's Avatar
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    I would use a clevis hangar supported by threaded rod.


  3. #3
    Moderator & Master Plumber hj's Avatar
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    Plumber's tape hanging from the joists may LOOK flimsy, but it will support more weight than that line will ever create.

  4. #4
    DIY Member bsperr's Avatar
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    You can also cut a v-notch into some 1*4 pickets secured vertically from the joists and strap the waste pipe into those with some plumber's tape.

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