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  1. #11
    Join Date
    Jun 2009
    Posts
    271

    Default Re: Leaking foundation wall

    Quote Originally Posted by Brookworld View Post
    What would you do ?
    Use correctly and as per manufactures instructions epoxy or Xypex will work.
    As for being a band - aid some epoxy's are designed and used under water to repair bridges and dans. these epoxy's have a greater PSI than concrete and injected correctly will cover the cracks intire depth.
    Xypex is also used on the positive or negitive side of dams,interior elevator pits, sewer plants and below ground water tanks.I use it for water proofing behind stucco works great.

  2. #12
    Join Date
    Dec 2007
    Location
    Tennessee
    Posts
    1,419

    Default Re: Leaking foundation wall

    According to Clarence, some epoxies are designed to be used under water. That is true, but the under water side of your basement is on the outside, not the inside so any repair on the inside is a bandaid. Also, even if the repair does hold up over time, there will be new cracks, so you will always be chasing cracks, especially if you live in and earthquake prone area.

    The best way is to have the perimeter of your foundation excavated and the exterior of the basement walls waterproofed. You need a flexible membrane type water proofing system so that any movement in the basement walls will not introduce new leaks.

    But, once waterproofed, there is still the issue of the structural integrity of the basement walls. You should have the cracks inspected and there is the possibility that the cracks may have to be addressed anyway.

  3. #13
    Join Date
    Jan 2008
    Posts
    1,330

    Default Re: Leaking foundation wall

    Get a structural engineer out there to check things- the earthquake could have cracked more than that wall and in that case no wall repair will hold long as things keep moving. Even if epoxy holds that crack another will appear as long as movement continues.

    As always, the best place to stop water is before it touches the structure. An outside waterproofing membrane is the best way to go but it may require a lot of excavation and re-landscaping to do. No interior-applied waterproofing method really works well over time, and only those that include drainage are guaranteed to last- now if there isn't any water getting in after they 'waterproofed' why must they allow for drainage of water out afterward? Think about that, and always apply waterproofing outside the structure where it belongs.

  4. #14
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: Leaking foundation wall

    I don't believe in trying to keep a basement dry by simply patching all the cracks in a wall from the interior.

    First thing, consider the fact that around 80 percent of all basement water leaks can be handled by getting outside water away from the foundation --- rain gutters to collect the water flow from the roof, downspouts set up to get it at least 5 feet away from the foundation and landscaping that stops run-off from flowing towards the house -- especially in the spring while the ground is frozen. Those three efforts are critical because even if we do manage to perfectly seal a crack, if there is a lake outside that wall, the water will just move down the wall until it finds another crack. Often if we remove the water, we don't even need to seal the crack.
    .


    Epoxy is a good adhesive and a good sealant but it has the one major drawback that it cures very rigid. If there is any vibration or movement in the wall, the concrete will easily crack again, right next to the epoxy repair.
    Polyurethane is a more flexible material that can handle vibrations and a little growth in the crack. Neither system is any good on cement block foundations because of the hollow cores in the blocks. They require repointing the mortor with cement based products.

    With either material if they are not fully injected into the crack ( from interior to exterior ) then water will still enter the crack and cause further issues -- especially if the temperatures get to freezing .
    The same applies to a topical application of hydraulic cement.

    Hence --- the band-aid analogy.

    I echo the comments made by keith3267 & Mastercarpentry in that repairs and waterproofing the exterior foundation wall is by far the superior way of doing things. This is the preferred method by many professionals ( engineers and the like ) if the simple steps mentioned above don't resolve the water infiltration.
    "" an ounce of perception -- a pound of obscure "
    - Rush

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