Repairing Large Holes In Concrete Walls

A huge hole in the cement wall that separates our garage from our basement.

Repairing large holes in concrete walls. How to fix a big hole in a cement wall when a posted a little while ago about sealing and patching holes in my garage i conveniently left one small thing out of the narrative. Tap the chisel with a hammer and chip downward to the back wall of the block creating a larger. If the holes were smaller i would use hydraulic cement which actually slightly expands as it cures with about a 3 4 minute working time. For that size vertical hole you may need to brace a board over the hole to hold in the patch until it dries.

If this is just a wall above ground on both sides you can mix up some concrete patch and fill the hole back in. Or rather one very large thing. If your aim is to make the wall look better a smooth surface is also easier to paint. Holes this large make that type of fix impractical.

The only way to repair foundation wall cracks successfully is by the injection process. Deep patch is solid concrete repair product for patching large holes in concrete surfaces. You can use mortar mix to repair masonry but it is about 4 5x as expensive and the finish isn t that much nicer. The injection process fills the crack from top to bottom from inside to outside.

Lay the chisel on the edge of the hole and point it downward at a 45 degree angle into the block. Concrete mix is similar to mortar mix the stuff i used to pour the floor of my shower but it is made up of sand and cement only. Surecrete s solid cement filler is a single component just add water cement based chemical patching compound system providing a patch that goes from 1 8 0 32 cm and up. Concrete is is a lot coarser and includes large rocks and gravel.

To permanently patch the crack we used an epoxy injection system from polygem called the liquid concrete repair kit 60. If this is a retaining wall you need to fix the problem ont he other side of the wall first.