What is best for patching foundation crack or flaw that leaks?

Tar or hydraulic cement? I tried concrete and roof cement ,with just the concrete it still leaked, hoping that roof cement can stop leaking,,,not sure what to do if it doesn't work,,, any suggestions? thanksWhat is best for patching foundation crack or flaw that leaks?
As you have found out, you can not use regular concrete. You have to use hydraulic cement. On top of this you have to make sure that you chisel out the crack deep enough for the hydraulic cement to expand and grip the existing concrete.





This is acceptable for small leaks like rusting concrete form ties. However when it is a much larger crack you can go with polyurethane concrete injection at about $30 per foot.





Otherwise cracks have to be repaired from the outside where the hydraulic pressure of the ground water is being applied. If the crack is high enough, you can dig down manually, clean the wall, apply the tar/fiberglass/tar coating at least one foot on either side of the crack. If the crack is lower down and you can manually dig it out, it would be best to use the tar/fiberglass/tar along with a dimpled membrane that will allow the ground water to your weeping tile. This is assuming that your weeping tiles are working properly.





The best solution is to have your whole foundation wall sealed but that is expensive as you obviously know having asked the question about patching. Abalon is expensive. They do know their stuff, however. There are other contractors who can do it for less.What is best for patching foundation crack or flaw that leaks?
Hydraulic cement. I have used it in a basement next to the Illinois river and it worked great.It will also work even if the area is wet. Chiseling out the area is a good idea to give it a clean area and also to give it more area to bond. If the area is painted, use a wire brush attachment on a drill to remove any loose paint. Make sure you only mix up enough to use in a short time period as it sets up very fast.
The only way to really seal it is to dig down on the outside of the foundation, seal the crack properly with cements and tar then back fill. The inside can be filled with epoxy designed for concrete sealing but not before the crack is secured from the outside.


It's a ***** to do but the best way I know.
Use aqua plug cement but take note this stuff will dry within 6 to 8 minutes so, make it sure you mix enough to handle within 5 minutes so that you don't waste the materials.Good luck....





Owsss... one more thing those crack need more opening before you patch in order it will properly stick this aqua plug cement.This material you caeasilyly pick up at the hardware store or even at the paint store that carry some other stuff (not only paint)