leak from rain where water supply enters foundation

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by fjbuono, Oct 8, 2005.

  1. fjbuono

    fjbuono New Member

    Oct 8, 2005
    For some reason, my basement foundation has a large opening
    with a 2" pvc (conduit) running through it - about 9" long.
    In the pvc pipe is my copper water supply line - from the street.

    The leak - on heavy rains - is producing water inside the pvc
    pipe where it drips out on to the basement wall. The copper
    water line is at such an angle in the conduit that I can't see or reach the
    dirt (?) on the outside of the foundation to visibly see the leak.

    I guess I have no choice but to seal up pvc conduit to stop the
    leak?? If so, what product should I use to do this?


  2. plumber1

    plumber1 Plumber

    Aug 7, 2005

    Seal it. It should have been seald to begin with.
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  4. Gary Swart

    Gary Swart In the Trades

    Sep 1, 2004
    Yakima WA
    Best thing I've found is hydralic cement. It seals even if water is coming through the hole. You may want to enlarge the hole a bit to be able to pack the cement in, but this will do the job. This product comes in quart sized cans. You mix just the amount you will be able to use immediately because it will set up quickly. Wear rubber gloves when you handle the stuff, it's very caustic.
  5. fjbuono

    fjbuono New Member

    Oct 8, 2005
    what product?

    What product do I use? I assume some kind
    of expandable gel?


  6. jimbo

    jimbo Plumber

    Aug 31, 2004
    San Diego, CA
    DO NOT use any cement product in contact with the copper.

    Check with a local buliding material supplier for some kind of sealant. I would prefer to install this at the outside end, but I assume you are several feet below grade so this is not practical.
  7. fjbuono

    fjbuono New Member

    Oct 8, 2005
    Yeah, it's 7 feet down.

    Since I have to fill the
    inside of the pvc pipe conduit (which has the
    copper pipe in it) I was hoping I could fill it with
    some kind of expandable waterproof foam that
    would adhere to the inside of the conduit and not
    harm the copper pipe.

  8. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    I'm not sure about all, but many of the aerosol cans of foam use a weak acid to create the foaming action...check first, it may not be a great thing in contact with the copper, either.
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