How to Repair a Crack in a Concrete Wall


A crack in one of your home's concrete walls can present a health hazard to you and your family. Cracks allow moisture to enter the home, promoting the growth of mold and mildew, and depending on where you live, a crack in a basement wall can allow radon gas to enter your home. By tackling cracks when they appear, you can eliminate these problems and stay in front of potential side effects.

Things You'll Need

  • Blow dryer
  • Wire brush
  • Shop vacuum
  • Concrete filler kit
  • Trowel or putty knife
  • Power sander and sandpaper
  • Safety goggles
  • Dry the crack with hot air from a hair dryer or heat gun if there is any moisture present in the crack.

  • Scrub the crack and the surrounding concrete with a stiff wire brush to remove any loose debris. Vacuum away any dust or debris with a shop vacuum.

  • Prepare your concrete filler according to the manufacturer's instructions. Sealants come in a variety of different types, some premixed and some that requiring mixing prior to application.

  • Inject or squeeze the concrete filler/sealer into the crack, stopping when the filler reaches the level of the wall. Different types of fillers will use different injection methods--some come in squeeze tubes, some require a caulking gun, and some have specialized injectors--follow the manufacturer's directions. Let the filler dry thoroughly. The filler will shrink, so then apply a second application, and fill the crack to overflowing.

  • Spread out the excess filler from the second application with a trowel or putty knife, and allow it to dry.

  • Sand down any protruding surfaces with a power sander and heavy grit sandpaper. Paint or otherwise prepare the surface as you desire.

Tips & Warnings

  • Wear safety goggles when scrubbing and sanding the concrete to avoid eye injuries.

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