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Thread: leak from rain where water supply enters foundation

  1. #1

    Default leak from rain where water supply enters foundation

    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?

    Thanks.

    Frank

  2. #2
    Plumber plumber1's Avatar
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    Default pipe

    Seal it. It should have been seald to begin with.

  3. #3
    In the Trades Gary Swart's Avatar
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    Default

    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.

  4. #4

    Default what product?

    Quote Originally Posted by plumber1
    Seal it. It should have been seald to begin with.
    What product do I use? I assume some kind
    of expandable gel?

    Thanks.

    Frank

  5. #5
    Plumber jimbo's Avatar
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    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.

  6. #6

    Default

    Quote Originally Posted by jimbo
    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.
    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.

    Frank

  7. #7
    Retired Defense Industry Engineer jadnashua's Avatar
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    Default

    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.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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