awkward..how to seal drain pipe???

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by scrappy, Oct 17, 2009.

  1. scrappy

    scrappy New Member

    Messages:
    21
    Location:
    New York
    I had a drain put in the upstairs laundry room floor below our new washer. Long story, but i needed to rip it out and now am left with a small diameter hole in the subfloor AND built up mortared/tiled floor. The drain wash roughly removed from the floor and now i need to seal it as it is no longer going to be used. I DO NOT WANT TO RIP THE HOLE BIGGER IN THE FLOOR DUE TO THE AWEFUL DUST HAZZARD CREATED BY THE MOTAR.

    The drain pipe runs out from the wall about 36". The drain goes down to the basement and has a vent that goes up and out the roof. I figured I could just cap the drain pipe where it goes out 36" from the wall. But as i mentioned, not a lot of room to work.

    WILL SOMETHING LIKE THE EXPANDING INSULATION SEAL IT UP SUFFICIENTLY? I'M WORRIED ABOUT POTENTIAL GASSES COMING UP THROUGH THE DRAIN. NOT REALLY A CONCERN FOR ANY WATER COMING OUT OF IT.

    I know this is probably very poorly explained. pleaseask specificquestions ifneeded. thanks for the help.
    Scott
  2. nhmaster

    nhmaster Master Plumber

    Messages:
    3,189
    Location:
    S. Maine
    You can cap the pipe, the hole you will have to get creative
  3. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,770
    Location:
    New England
    They make expanding rubber plugs you could use if you can't get access to put an end cap on it. the plugs have a bolt that you tighten that expands the plug to make the seal.
  4. jeffeverde

    jeffeverde New Member

    Messages:
    79
    Location:
    L.A.
    If this is a second-floor installation, why not cut and cap the branch from bellow? From your description, it sounds like you still have a stub of pipe penetrating the floor, and you're going to want to pull that out to patch the floor properly.

    As for "THE AWEFUL DUST HAZZARD CREATED BY THE MOTAR" -- it really isn't. If you're using a diamond saw/grinder, yeah, it throws up a lot of dust -- but just have someone hold a shop vac next to the blade as you're cutting and it will capture virtually all of the dust. But for a small thing like a drain pipe, there's no need to even do that. Just use a hammer and cold chisel to chip out the inch or so of clearance that you need and you won't have any dust at all.

    Finally - did you move the washing machine, or did you just change your mind about the drain. Many jurisdictions now require a floor drain for any above-grade washing machines and water heaters.
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