How to Repair a Cracked Basement Wall From the Inside


Basement walls are important for connecting your house to its foundation and supporting the house above. If you notice a cracked wall or know moisture is coming in, it's time to fix it before the problem gets worse. Sometimes you may even have a large enough crack to cause a slight bow to an interior basement wall. If your wall looks bad, consult a building engineer.

Things You'll Need

  • Gloves
  • Respirator
  • Knee pads
  • Eye protection
  • Ear protection
  • Concrete sealer
  • Smooth trowel
  • Sponges
  • Galvanized strapping (large for wall repairs)
  • Permanent marker
  • Roto hammer drill
  • Extension cord
  • Concrete bits
  • Heavy duty concrete wall anchors
  • Hammer
  • Stainless steel lag screws
  • Socket wrench (for lags)

Small Cracks

  • Put on protective gear. Scrape away loose concrete chunks with your scraper.

  • Apply concrete sealer to the affected area by using a smooth trowel. Force the sealer into the joints. The sealer is waterproof and goes on quite thick. Remove buildup with a wet sponge.

  • Let product dry according to the manufacturer's instructions. You may have to apply more than one coat.

Slightly Bowed Walls: Galvanized Straps

  • Attach large, galvanized strapping to the wall, from top to bottom, across the crack. Place the galvanized stripping about every 3 feet across the width of the crack.

  • Place metal straps on the wall where you will mount them. Have a helper hold them in place while you mark drill holes on the wall with a large permanent marker.

  • Drill anchor holes using the roto drill hammer. Insert anchors with a hammer. Place the straps in place and put the lags into the anchor holes. Tighten with a socket wrench. Repeat this process for every crack. Wide cracks may require more than one galvanized strap.

Slightly Bowed Walls: Epoxy Mesh Strips

Tips & Warnings

  • If your walls are bowed badly, consult a building engineer right away for help.

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  • Photo Credit Jupiterimages/Comstock/Getty Images
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