Question

Describe the method available for repairing cracked foundation walls.

Answer 1

1)Thin hairline cracks can usually be repaired with a vinyl concrete patching compound.

2)Cracks wider than a hairline can be filled with Polyurethane, silicone, or latex concrete caulk. Use a caulking gun to force the caulk into the crack along its entire length. This type of caulk is effective because it fills the entire crack space and allows for the expansion and contraction of the foundation during extreme changes in weather. After application, let it dry. Apply again if it contracts inside the crack and doesn’t fill the entire depth of the crack.

If cracks are wider than 1/2" and as deep, you may need to use foam backer rods in addition to concrete caulk. Sold in a variety of lengths and diameters, foam backer rods are great for supporting a patch and preventing the patch from sinking into any cracks as it dries and ages. Use a putty knife to force the flexible rod into the crack, placing it about 1/4'' below the surface.

3)Now that the crack has been filled and the patch has set or dried, you're ready to apply waterproof masonry sealer to the foundation walls. This will protect the concrete from any water infiltration. Existing paint and coatings must be removed from the surface and the concrete must be able to absorb water. For the best results, apply the sealer with a brush directly to the patch. The second coat can be applied with a large brush or masonry roller. Work sealant thoroughly onto the patch and around it by a few inches to 1' to ensure a proper seal.

4)Besides sealing your foundation walls, the most important thing you can do to preserve the integrity of your foundation is to keep water away from it as much as you can.

Make sure your gutters and downspouts are properly functioning. Inspect them for damage and ensure that they are clean, clog-free and running smoothly. Gutters are designed to collect rainwater and flow through downspouts directed away from the house foundation. When water pours over gutter sides, it soaks into the ground near your home’s foundation. Excess water can cause the soil to expand, applying stress to your foundation, or can infiltrate the foundation walls.