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Apr 18, 2021
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How to repair a concrete crack in a wall or floor

How to repair a concrete crack in a wall or floor

Concrete walls, screed and blind areas often have small cracks. Precipitation gets into them, freezes in winter, expands and tears concrete. To avoid this, even narrow cracks need to be repaired. This can be done quickly and easily with a sealant.

What you need:

  • polyurethane adhesive sealant;
  • sealant gun;
  • putty knife.

How to repair a concrete crack in a wall or floor

Crack repair process

Cracks should be blown out or vacuumed before sealing to remove any dust present in them.

How to repair a concrete crack in a wall or floor

They are then filled with sealant from a pistol.

How to repair a concrete crack in a wall or floor

How to repair a concrete crack in a wall or floor

Excess sealant is removed with a finger or a spatula. Then you need to give time to the composition to dry, and if necessary, the surface can be sanded.

How to repair a concrete crack in a wall or floor

Potholes on concrete surfaces are repaired in the same way. Polyurethane sealants, once cured, are similar to rubber. They can stretch more than 300%. Thus, if the crack begins to expand, then the repair compound will stretch with it and still prevent moisture from penetrating inside.

How to repair a concrete crack in a wall or floor

How to repair a concrete crack in a wall or floor

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