How to Fix a Cracked Concrete Driveway

Fill small cracks with concrete crack filler or caulk, and patch larger cracks by cleaning them out, applying bonding agent, and filling with concrete mix.

1. Clear Every Speck Out. Remove all loose concrete, dirt, weeds, and debris from the crack using a wire brush, chisel, or pressure washer. For hairline cracks, use a stiff brush. For larger cracks, you may need to widen them slightly with a chisel to create clean edges that will hold the repair material better.
2. Pick Your Weapon. For cracks less than 1/4 inch wide, use concrete crack filler or polyurethane caulk. For cracks 1/4 to 1/2 inch wide, use concrete crack filler or hydraulic cement. For cracks wider than 1/2 inch, use concrete mix or mortar.
3. Prime for Maximum Hold. If using concrete mix for wide cracks, brush concrete bonding agent into the crack and on surrounding area. This helps the new concrete adhere properly to the existing surface. Allow it to become tacky but not completely dry before proceeding.
4. Pack It Solid. For small cracks, squeeze crack filler directly from the tube, slightly overfilling the crack. For larger cracks, mix concrete according to package directions and press it firmly into the crack with a trowel, ensuring no air pockets remain. Smooth the surface level with the surrounding concrete.
5. Make It Invisible. Use a putty knife or trowel to smooth crack filler flush with the driveway surface. For concrete repairs, use a float to match the texture of the surrounding area. Remove excess material and feather the edges so the repair blends seamlessly.
6. Let It Harden Right. Let crack filler cure for 24 hours before allowing foot traffic, 48 hours for vehicles. For concrete repairs, keep the area damp for 24-48 hours by covering with plastic sheeting or misting occasionally. Full strength develops in 7 days.