To repair a stable crack , chisel cut a keyhole cut that’s wider at the base than 1/2 inch deep . Clean out the crack with a wire brush.
To help seal against moisture ,fill the crack with expanding insulating foam, working from bottom to top.
Mix hydraulic cement according to the manufacturer ‘s instructions then trowel it into the crack , working
from the bottom to top. Apply cement in layers no more 1/4 inch thick , until the patch is slightly higher
than the surrounding area . Feather cement with the trowel until it’s even with the surface . Allow to dry
Water proof Paint
Masonry paints and sealers , especially those that are described as waterproof, are rather controversial products. Some manufacturers , claim that applying a coat of their waterproof paint will create a seal that can hold back moisture , even under light hydrostatic pressure. Other suggest only that their product , when applied to a basement wall, will create a skin that inhibits water penetration from the interior side.
Masonry paints do hold up better on concrete surfaces than other types, largely because they are higher in alkali and therefore less reactive with cement based materials . But they also can trap moisture in the concrete ,which will cause the paint to fail prematurely and can cause the concrete to degrade , especially
if the water freezes. Read the product label carefully before applying waterproofing paint to your basement walls, and make sure to follow the preparations protocols carefully . If you have a foundation wall with an active water seepage problem , address the problem with the other methods shown in this sections, including grading and gutters . A coat of waterproof paint is not to make your basement drier .
Clean your gutter and patch any holes. Make sure the gutters slope toward the downspouts extensions and splash blocks to keep roof runoff at least 8 feet away from the foundation.
Cover window well that will other wise allow water into basement Covering them with removable plastic is the easiest way to keep them dry. Covers on egress window wells must be easily removed from inside …
If you prefer to leave wells uncovered, add a gravel layer and a drain to the bottom of the well. Clean the well regularly to remove moisture heavy debris .
Things you need to fix concrete water proofing : trowel concrete mortar type S , or hydraulic cement for super water proof basement . Shovel and wheel barrel mix and water proper mixture . Concrete rake and concrete self level make easier for concrete to float cover the crack. Sand paper or heavy or epoxy if you did not properly level out and make smooth the concrete. Paint brush and caulk gun to brush in pattern the concrete to leave the pattern where concrete is much harder to break 30 years later .