How to Repair Concrete Cracks in Driveways and Garage Floors

CONCRETE is inherently strong but rarely stays perfect forever. Whether it is shifting soil underneath or the relentless freeze-thaw cycles of a changing climate, cracks are an inevitable feature of almost every driveway and garage floor. Ignoring them allows water to seep deep into the sub-base, turning small fissures into crumbling gaps that require expensive professional intervention. Repairing these cracks yourself is straightforward if you prioritize the prep work. The actual filling of the crack takes minutes, but the durability of your repair hinges entirely on how clean the gap is before you start. When done well, your patch will prevent further erosion and keep your concrete surface looking uniform and structurally sound for years to come.

1. Brush Out Every Particle. Use a wire brush to scrub the crack, removing loose pebbles, dirt, and moss. Use a shop vacuum to suck out every speck of dust so the filler has a clean surface to bond with.
2. Wash & Wait. Spray the crack with a garden hose or pressure washer to remove any remaining stubborn silt. Let the concrete dry completely for at least 24 hours before moving to the next step.
3. Mix Your Materials. If using a tube-based filler, cut the nozzle to the width of the crack. If using a tub-based mortar mix, ensure you mix it to a consistent, thick paste consistency according to the package instructions.
4. Pack It Full. Squeeze or trowel the filler into the crack, working from one end to the other. Ensure the material fills the entire depth and doesn't leave large air pockets.
5. Strike It Flush. Use a masonry trowel or a putty knife to strike off the excess filler. Drag the tool across the surface to level the patch flush with the surrounding concrete.
6. Let It Set. Keep the area clear of foot traffic and vehicles for the time specified on the filler container. Most products require 24 to 48 hours for a full cure.