How to Repair Cracks in a Concrete Driveway

Concrete driveways endure a punishing life cycle of extreme temperature swings, weight loads, and moisture penetration. Cracks are often the first sign that the subgrade is shifting or that water has begun to erode the material beneath the slab. If you address these fissures early, you prevent minor surface cracks from turning into deep, crumbling voids that require a total replacement. Repairing cracks isn't about hiding the evidence; it's about structural preservation. A well-executed patch stops the freeze-thaw cycle from expanding the crack further and keeps debris out of your slab's foundation. Done right, the repair will blend in over time as the patch weathers, leaving you with a surface that is once again sealed against the elements.

1. Strip it clean. Use a wire brush to scrub away loose concrete, dirt, and moss from the crack. Follow up with a shop vacuum to remove every speck of debris so the filler has a clean surface to bond to.
2. Rinse and wait. Spray the crack with a garden hose or pressure washer to rinse out any remaining fine dust. Let the area dry completely for at least 24 hours before moving to the filling stage.
3. Build the base. If the crack is deeper than half an inch, push foam backer rod into the opening until it sits about half an inch below the surface. This creates a base for the filler and prevents it from sinking too deep.
4. Fill it tight. Cut the tip of the filler tube at an angle and use a caulking gun to run a steady bead into the crack. Slightly overfill the crack to account for settling as the material dries.
5. Level it flush. Use a trowel or a putty knife to pull the excess material flush with the driveway surface. A light mist of water on your trowel will help keep the filler from sticking to the tool.
6. Stay off it. Allow the repair to cure undisturbed for at least 24 to 48 hours. Keep foot and vehicle traffic completely off the patched area until the material is fully set.