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 "