How to Repair Cracks in Concrete

Concrete is one of the most common building materials, partially for its structural stability as well as its affordability. But concrete isn’t immune to cracking. Usually this occurs either when a house settles, the ground shifts or during the curing process, when any water in the concrete slurry evaporates so that the concrete can properly harden. Cracks may be unsightly, but under normal circumstances, they shouldn’t impact a home’s structural integrity. But with that being said, it’s always a good idea to repair these cracks, as they can provide an entryway into your home for water, bugs and radon. This post will take a closer look at how to repair cracks in concrete:

How to Repair Cracks in Concrete

You could fill the crack with a masonry patching product, but these usually fail after a few years. So for the best long-term success, the best option is to permanently repair it with an epoxy injection system kit of some sorts. While this may seem daunting, it’s very feasible, even for the amateur DIY’er.

  • Prep the crack: Start by using a wire brush to clean loose concrete, paint or filler. Remove any dust and debris with a vacuum and make sure the crack is dry.
  • Block injection ports: Tap finishing nails into the crack about a foot apart from each other.
  • Mix the sealer: Follow the directions on your repair kit to mix the epoxy crack sealer to fix the crack. This is usually done with a putty knife on a scrap board.
  • Install injection ports: Slide these over the nails that you tapped into the crack during step two of the process. You may have to dab sealer onto the base in order to get it to adhere to the wall.
  • Apply the sealer: Apply sealer to the crack with a putty knife or towel. Cover the flanges of the injection ports, too. Smooth out the sealer before moving on to the next step.
  • Let the sealer cure for up to 10 hours.
  • Inject epoxy into the crack, starting at the lowest injection port with a caulk gun. Move on to other ports only when epoxy begins oozing out of those that are higher on the crack. Be sure to plug ports before moving on to the next one.
  • After the epoxy has been injected into the crack, allow it to cure for five days.
  • After five days, cut off the necks to the ports with a saw. At this step, you can also patch any ports with a crack sealer.

Cracks and concrete go hand in hand, and while the above “how to” process is one that is used on a concrete sidewall, the steps are similar for a concrete floor. Remember, just because you have a crack in your concrete wall or floor doesn’t mean that the structure is compromised – but it’s always best to tend to in order to prevent water, insects and radon from becoming an issue in your home.