Sewer main under concrete slab foundation

Discussion in 'Remodel Forum & Blog' started by TJP, Sep 30, 2007.

  1. TJP

    TJP New Member

    Messages:
    2
    Location:
    portland,or
    Hello, I am new to the forum and new to home improvement. I have an unfinished basement that I would like to add a bathroom to. I have cut a hole, dug and located the 4" cast iron main that the upstairs main feeds into. My question is, can I connect to this underground main with ABS pipe or is cast iron required under concrete slab? The soil I have encountered is like clay with very little rock and not much moisture. Any help would be greatly appreciated.
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,817
    Location:
    New England
    [​IMG]

    ABS is allowed underground as I understand it, but you'd need to check with the local authorities to see if they allow it. Snap the cast iron with a rented snap cutter, then use a fernco connector to patch in the fitting and new pipe. You need to maintain 1/4" per foot for the new stuff to that point.
    Last edited by a moderator: Jan 20, 2008
  3. TJP

    TJP New Member

    Messages:
    2
    Location:
    portland,or
    Thanks for your input. I am trying to avoid a nightmare re-do.
  4. Lakee911

    Lakee911 I&C Engineer (mostly WWTP)

    Messages:
    1,328
    Location:
    Columbus, OH
    A vent might be needed for the toilet too.
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