Repairing A Poured Concrete Foundation Crack With Epoxy

Poured concrete foundations can become cracked as the house settles into the ground. When the concrete cracks, water from rain, and snow melt can leak through the openings and flood the basement. To prevent this type of flooding, you need to seal the crack to keep the water out. Here is how you can seal cracks in poured concrete foundations.

You Will Need:

  • Concrete Crack Sealing Kit
  • Wire Brush
  • Injection Ports
  • Caulk Gun
  • Hair Dryer
  • Hacksaw
  • Hammer
  • Nails
  • Utility Knife
  • Putty Knife

Prepare Cracks

Step 1: Clean out the crack to remove any debris that could interfere with the ability of the epoxy to cling to the foundation walls. Run a trowel up and down the crack to scrap away the broken pieces of concrete.  

Step 2: After you scrap the crack clean, use a wire brush to smooth the exterior surface of the crack.

Step 3: If you see moisture in the crack, you'll need to dry the crack before you apply the epoxy. You can use a hair dryer to dry the crack.

Step 4: Place small nails about a foot apart from each other into the crack. The nails should be thin and long enough to slip the injector ports over them. The injector ports are hollow pieces of plastic that come with the concrete crack sealing kit. and you'll shoot epoxy though them to fill the inside of the crack using a tube of epoxy and a caulk gun. 

Apply Epoxy to the Surface

Before you apply epoxy, slip the injection ports over the nails you put in the crack. 

Apply epoxy to the surface of the crack. You want to push the epoxy into the crack for about a half an inch to an inch to get a good seal. Spread the epoxy over the base of the injection ports. Remove the nail once the base of the port is secured to the crack.

Spread the epoxy so it covers the entire length of the crack. You also want the epoxy to extend about an inch on both sides of the crack.

Use a paint brush dipped in mineral spirits to smooth the crack and feather out the edges.

Wait until the epoxy on the surface dries before you inject epoxy into the crack (about a day).

Applying Epoxy into the Crack

Place a tube of epoxy into a caulk gun. Cut the tip of the tube with a utility knife. The tip should be cut flat so it fits over the injection port.

Start at the bottom of the crack. Remove the nail in injector port, slide the epoxy tube over the injection port, and squeeze the handle on the caulk gun. Stop squeezing the handle when you see epoxy start to come out of the injection port above the one you are working on.

Plug the injection port with a plastic cap that come with the ports.

Move to the injection port above the one you just filled and repeat the process. Keep on repeating the process until you get to the top of the crack.

Cut the injection ports off with a hacksaw after the epoxy dries. The drying time takes about a week.

For assistance with foundation crack repair, talk to a professional.