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Thread: hydraulic cement - foundation leak - supply pipe

  1. #1

    Default hydraulic cement - foundation leak - supply pipe

    Water is leaking out of the hole where the water supply pipe
    goes through the foundation.

    I'm not sure if this belongs in the plumbing section or not,
    but it does concern the water supply pipe coming into my
    house from the street.

    My water supply pipe (from the street) comes through
    a poured cement foundation about 4 feet down from ground level.
    Its a black plastic pipe.

    Anyway, the pipe itself is not leaking, ground water from the
    rain is coming into the house where the supply pipe
    comes through teh foundation.

    This is the first time it has ever leaked at this spot in the 14 years
    i have lived here. I am almost certain it is because
    of large amount of rain we have received in the last week or so.
    I live half way between Baltimore and Philadelphia.

    It appears as if they drilled the hole in the foundation to lareg and packed
    it with hydraulic cement to seal it.

    A piece of this cement underneath the pipe has broken loose
    and this is where the water is leaking in. Luckily there is only a small
    stream coming down the wall and into a french drain.

    The hole where the water is coming in is about the size of a pencil
    and the rest of the cement around the area appears to be solid.
    I haven't found any loose cement.

    I would like to plug this hole.

    I plan on just using hydraulic cement to do it.

    If anyone has any advice/tips etc. please post them.

  2. #2


    If it were me, I'd make sure the hole is large enough for you to get a good wad in there. If yr mixing yrself, only use enough water to make it workable. Plug the hole with the wad and it should set/expand to be water tight.

    If you find the rest of the patch starts failing, then be prepared to chip out the whole patch and reset it. But I bet the patch will work fine. That stuff expands hard and tight.
    (important note: I'm not a pro)

  3. #3
    Plumber Cass's Avatar
    Join Date
    Nov 2005


    Unless there is so much water coming through that you have to stop it now, I would wait utill it stops and drys up, then remove all the old HC and reseal the whole hole again.

    If you do that, be carefull that you don't puncture the pipe while removing the old HC.


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