How to Repair a Concrete Wall in a Basement


It's sometimes necessary to repair cracks and chips in your basement's concrete walls. Over time, concrete becomes damaged by repetitive freezing and thawing of the surrounding soil, foundation settlement or concrete joint breakdown. Regular maintenance will keep the concrete basement walls strong and durable. If these cracks or chips aren't fixed, they can grow and lead to other more expensive problems that only a professional can repair.

Things You'll Need

  • Cold metal chisel
  • Hammer
  • Wire brush
  • Large cup
  • Concrete patching compound
  • Bucket
  • Long-handled wooden spoon
  • Wide putty knife
  • Plastic sheeting
  • Duct tape
  • Spray bottle
  • Insert a metal chisel into the freezer compartment of the refrigerator for one hour.

  • Remove the metal chisel from the freezer. Use the cold chisel it to undercut the concrete crack by tapping the chisel into the concrete crack with a hammer. To undercut means to make the interior crack at least two times wider than the crack edges. Make the crack two times wider and deeper than the original size, leaving the edges untouched.

  • Brush away all concrete debris, particles and dust with a wire brush. Pour a large, water-filled cup into the crack to remove any smaller particles that remain. Allow the wet concrete to thoroughly dry for 12 to 24 hours.

  • Place concrete patching compound into a bucket. Use a long-handled wooden spoon to mix the patching compound with water, according to the package instructions.

  • Scoop out a golf ball-sized portion of patching compound with a wide putty knife. Smash the mixture into the concrete crack until the hole is overfilled. Smooth the damaged area with the flat surface of the wide putty knife. The patching compound must be completely level with the surrounding concrete wall.

  • Cure the patching compound by taping a square of plastic sheeting over the damaged area. Tape all the edges of the plastic sheeting with duct tape to ensure it is airtight.

  • Pull the top half of the plastic sheeting away from the wall, and spray the damaged area with a misting of water. Reseal the sheeting, and repeat this process once a day for five days.

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  • Photo Credit old cracked concrete wall: grunge background image by GoodMood Photo from
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