Building drain support above grade

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by mrd, Nov 28, 2010.

  1. mrd

    mrd New Member

    Messages:
    9
    Location:
    de, us
    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. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,249
    Location:
    Land of Cheese
    I would use a clevis hangar supported by threaded rod.

    [​IMG]
  3. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,835
    Location:
    Cave Creek, Arizona
    Plumber's tape hanging from the joists may LOOK flimsy, but it will support more weight than that line will ever create.
  4. bsperr

    bsperr Member

    Messages:
    74
    Location:
    Athens, GA
    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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