How to Fix the Holes in a Cinder Block Foundation Wall

The foundations of many homes are constructed of cinder block because the material is strong and easier to work with than some other materials. Cinder block also absorbs paint more readily if you decide you want to color your foundation. Over time, a cinder block foundation wall can develop holes, which, if left unrepaired, can lead to further deterioration. You can repair holes in your cinder block foundation with a small investment of time and effort, using the right materials.

Small chisel
Hammer
Whisk broom
Hydraulic cement
Bucket
Small masonry trowel

Instructions

- 1
  Chip away any loose material from around the hole using a small chisel and a hammer. Carefully remove the loose material so that the area surrounding the hole is solid block.
- 2
  Brush small debris out of the hole using a whisk broom. Ensure that the hole is free of debris and cinder particles.
- 3
  Combine hydraulic cement mix with warm water in a bucket. Mix the cement to the consistency of oatmeal. Hydraulic cement expands as it dries and resists leaks, making it the perfect material for filling holes in a foundation's wall. Hydraulic cement dries fast, so only mix it when you are ready to use it.
- 4
  Fill the holes in the cinder block foundation with the hydraulic cement, using a small masonry trowel. Press the cement into the holes and smooth it over the top of the holes using the edge of the trowel at a low angle to the block. Remove excess cement by using the trowel's edge at more of an angle to the surface.

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