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How to Seal Basement Floor Cracks

By Paul Ramone ; Updated September 21, 2017
Seal basement floor cracks with concrete repair caulk.

Concrete is a versatile and widely used material because it is relatively inexpensive and durable. In many most cases, a layer of concrete is applied to the basement of a home to act as the floor. Because the ground is constantly moving beneath the foundation of the home, the concrete surface may crack. While this is not a problem structurally, the cracks do look unappealing. You can, however, seal the cracks easily and effectively with a concrete sealant.

Cut the tip of the concrete repair caulk tube at a 45-degree angle with the utility knife.

Insert the tube into the caulking gun and squeeze the trigger until a small amount of caulk reaches the tip of the tube.

Insert the tip of the caulk into the floor cracks and apply a thick bead of caulk along the length of the cracks.

Smooth over the repair caulk on the surface of the concrete with a putty knife. Allow the caulk repairs to dry fully for 24 hours before using the surface.


Things You Will Need

  • Utility knife
  • Concrete repair caulk
  • Caulking gun
  • Putty knife