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  1. #1
    Join Date
    Dec 2007

    Default basement wall leak

    I need to repair a leak in a basement wall in a 50 year old house in Baltimore. Hydraulic cement manufacturers suggest a dovetail type slot be cut for the best results. What is the favored way to achieve this for an interior space? The best suggestion I have heard to date is to use a circular saw with a diamond blade.

    The other option appears to be injecting epoxy or polyurethane. The downside here appears to be the need to order the stuff as opposed to picking it up at the nearest home improvement center.

    Has anyone had favorable or unfavorable results with either of these methods?

  2. #2
    Join Date
    Aug 2007

    Default Re: basement wall leak

    Hydraulic cement is usually used to stop an active water flow thru a small hole in the cement foundation.

    Otherwise you can save $$ by buying a 30 lb sack of quick-setting concrete, or even a 60 lb bag of standard ready mix.

    Chipping an adequate hole in the wall to allow the cement to bind and seal the hole can be done mostly with a hand steel chisel and hammer (or baby sledge hammer); wear a heavy glove on the hand that holds the chisel, as you may well miss the chisel and hit your hand, and keep your eye on the chisel target as you strike the hammer.

    You can start the job doing an initial cut from a masonry-cutting blade on a circular saw ($5) or a diamond blade, but a diamond blade will cost ~$50.

    Foundation wall leaks are usually caused by a crack, unless it's coming from the bottom of the wall, or seeping in between the footing & the wall.

    Thus, you may have to go back a 2nd or 3rd time to make a repair before the wall becomes water-tight.

    As soon as you mix the concrete, and trowl it into the wall hole, jamb a piece of 2 X 6, or piece of plywood or other wood against the wall to hold in the wet concrete and brace the wood with a 2 X 4, or similar, until the concrete cures.
    Last edited by JacktheShack; 12-20-2007 at 10:24 AM.

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