How to Repair a Cracked Basement Floor


Basement floors are often made of concrete, which can be painted or left in the natural color. As the ground expands and contracts, it places stress on the concrete and can cause cracks to appear. If the cracks are thin and superficial, they can be easily repaired. The repair process is a simple one that most homeowners can accomplish themselves. This technique can be used to patch concrete floors in a garage as well.

Things You'll Need

  • Broom
  • Putty knife
  • Floor scraper
  • Water
  • Sponge
  • Concrete patch
  • Bucket
  • Sweep the basement floor with a broom to remove all dirt and dust that can interfere with the crack repair.

  • Examine the top surface of the crack and the surrounding floor for any chunks of dried concrete on the surface. Scrape these off using a putty knife or a floor scraper. The surface above the crack should be as smooth as possible.

  • Wet a sponge with water and rub it over the surface of the basement floor crack. This will remove any remaining surface dirt, as well as provide water to help the patch adhere to the floor.

  • Pour concrete patch powder and water into a bucket in the amounts indicated by the instructions on the bag.

  • Stir the mixture thoroughly with the putty knife to combine the water and patch mix.

  • Dip the putty knife into the patch mixture and scoop 1 to 2 cups onto the cracked area of the floor.

  • Position the putty knife vertically to the floor and pull the flat edge along the surface of the floor to smooth out the patch mixture. Completely fill the crack with the patch mixture and extend the patch out from the crack until the sides blend in evenly with the floor.

  • Insert the putty knife into the bucket and scrape off any excess patch mixture.

  • Pull the flat edge of the putty knife over the top of the patched area to smooth it out. Allow the patch to dry completely before walking on the repaired area.

Tips & Warnings

  • Concrete patch mixes harden in 3 to 4 minutes, so prepare it in small amounts if you have several cracks to repair.
  • If the crack in the basement floor is wider than 3/16 inch, have the home inspected for foundation issues before repairing the crack.

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  • Photo Credit hoses on concrete image by pearlguy from
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