How to Repair a Cracked Concrete Driveway

Small cracks can be filled with concrete crack filler or caulk, while larger cracks require cutting out the damaged area and patching with new concrete mix.

1. Clear Away Every Crumb. Remove all loose debris, dirt, weeds, and crumbling concrete from the crack using a wire brush, shop vacuum, or pressure washer. For stubborn material, use a chisel and hammer to chip away loose pieces. The crack must be completely clean for the repair material to bond properly.
2. Match Crack Size to Solution. For hairline cracks less than 1/4 inch wide, use liquid 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 or deep cracks, cut out the damaged area with a concrete saw and prepare for a full patch.
3. Pack It In Tight. For small cracks, squeeze the filler directly into the crack, slightly overfilling it. For larger cracks, mix the concrete patch according to package directions and trowel it into the crack, pressing firmly to eliminate air pockets. For full patches, wet the area, apply bonding agent if recommended, then fill with concrete mix.
4. Feather Flush with Concrete. Use a putty knife for small repairs or a concrete float for larger patches to smooth the repair flush with the surrounding concrete. Work quickly before the material begins to set. Remove any excess material that extends beyond the crack.
5. Patience Wins the Day. Keep the repair moist for at least 24 hours by covering with plastic sheeting or misting with water. Avoid walking or driving on the repaired area for 24-48 hours for small repairs, or up to 7 days for large patches. Follow the specific curing instructions on your repair product.