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Question DetailsAsked on 7/13/2014

Looking for a DIY concrete crack repair product for slab foundations

Have a concrete slab foundation on my 40-year-old house. It has previous foundation repairs from about 20-25 yrs ago: exterior piers around front half of house. Just had additional foundation repair work done (interior piers placed) and small cracks have opened across long sections of the slab from the stress of the lifting. Previously read about how to repair these small-width cracks with a type of glue, but can't find the article now. Can't remember the type of product, i.e., epoxy, polyurethane, or what? The cracks are probably more cosmetic than structural, but I'd feel better putting some kind of glue/sealant in the cracks. Also, the contractor drilled several test holes to find thickness of slab/beams and did not fill them. What can I use to seal them? Holes are approximately 1/2" in diameter and go through slab to soil, varying from 4-7" in depth. Thanks for any suggestions!

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1 Answer


The test holes you can get little bags (1 or 2 pounds each) of non-shrink patching grout you can mix up and pack into the holes - made by Dap, CustomBuilding, ITCO, Laticrete, Quikcrete, FastCrete, etc. For your small hole size (and cracks if used for that) you want an acrylic or epoxy modified grout, NOT a concrete mix. The same thing could be used for the cracks, or if you just want them filled in and covered, you could use concrete caulk - comes in a tube just like regular caulk but is made to bond to concrete. Dow, M-D, Dap are reputable names, among others. The caulk will expand some if the crack moves whereas the grout will not and will crack.

If crack is large or full depth, you might want to use foam backer rod so you are only filling the top of the crack (to limit amount of caulk needed), or point grout into the crack till full up to about the width of the crack from the top, then caulk that to provide a flexible seal.

Polyurethane crack sealer will also work and may last longer than caulk, but a lot more expensive and tough to clean up if you get messy - and minimum amount you can buy may be a lot more than you need.

If you are looking for a structural fix then a 2-componetn stone and concrete epoxy joint adhesive is what you are after - quite a bit more expensive material if you get a name brand and you have to work fast because cure time is VERY short. Probably overkill for your case.

Answered 6 years ago by LCD

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