Fixing Holes In Concrete Walls

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

Fixing holes in concrete walls.

You want the concrete surface in each hole to be perfectly clean. 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. Using a cold chisel and a 3 pound sledgehammer undercut the hole by making the pop out wider at the bottom than at the top. If you do have hollow cinder block walls then yes you will need to use a filler like spray foam for areas the holes go all the way into the center.

Pop outs are small conical shape chunks of concrete that have popped out and left a hole behind. Mix together in a bucket one part portland cement three parts sand and. Spray the hole out with water using a spray nozzle attached to a garden hose. If your aim is to make the wall look better a smooth surface is also easier to paint.

If this is a retaining wall you need to fix the problem ont he other side of the wall first. For that size vertical hole you may need to brace a board over the hole to hold in the patch until it dries. Just before filling each hole with the expanding concrete repair product use an old spray bottle and spritz the hole with a spray. Or rather one very large thing.

Holes this large make that type of fix impractical. If your home has concrete you may notice holes forming due to strong weather or rodents. Patching such holes is a necessary part of keeping your concrete foundation wall in good repair. Most holes can be fixed with a quality mortar mix although you should use one with a crushed stone aggregate to fill holes over 1 in 2 5 cm deep.

Kudzu9 12 years ago. Clean the hole with a stiff fiber or wire brush.