How to Repair Wall Cracks by Filling a Crack in a Concrete Wall



How to Repair Wall Cracks by Filling a Crack in a Concrete Wall

Step 1
Enlarge the crack with a chisel and hammer. A technique known as undercutting (which is essentially chipping away at the concrete) should be done to 1 inch (2.5 cm) below the edges of the crack. This provides more surface area for the patching material to grip.
Step 2
Clean debris from the crack using a wire brush. A vacuum can also help get rid of dust, pieces of concrete, or dirt lurking in the crack. Rinse it with water and dry thoroughly with a towel.
If you don’t have a wire brush, a flat head screwdriver or air compressor will work.
Step 3
Prime the area with a concrete bonding adhesive. This will help the patching material adhere better to the concrete. You’ll want to use an old paintbrush to spread a thin layer around the edges and deep into the crack.
Step 4
Apply multiple coats of concrete patching with a putty knife. Press each layer into the crack and let dry completely in between coats. Repeat until the crack is filled and level with the rest of the wall.
You can also use a pointed trowel if you don’t have a putty knife. This is good for pushing the patching into the crack.
Step 5
Add texture to the patched area before it dries. Matching new concrete to old concrete is difficult because it’s so smooth. Rough the last layer up with a broom or any tool while it’s still wet to make it look more worn.
Sealing the patch with a heavy-duty water-based polyurethane with a brush can prevent stains and other marks.

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