How to Patch Cracks in a Concrete Driveway

Concrete driveways are durable, but time and weather inevitably create fissures that can grow into major structural headaches if ignored. Water enters these cracks, freezes, and expands, which deepens the damage every winter. A patch performed early prevents costly slab replacement later. Successfully repairing a driveway isn't about hiding the crack perfectly; it's about sealing the concrete from moisture penetration. When done well, the patch will provide a flexible, watertight bond that stands up to heavy tires and changing temperatures. Focus on cleaning the crack thoroughly, as the repair material will only hold if it has a clean surface to grab.

  1. Strip Away Loose Debris. Use a wire brush to scrub the interior of the crack to remove loose concrete, moss, and dirt. Use a shop vacuum or a leaf blower to extract every bit of dust and debris until the base of the crack is exposed.
  2. Ensure a Bone-Dry Bond. Wash the area with a pressure washer or a stiff-bristled brush and water to ensure the concrete surfaces are free of oil and fine silt. Allow the crack to dry completely for at least 24 hours before applying any filler.
  3. Support the Repair First. For cracks deeper than half an inch, push a foam backer rod into the opening. This saves you from using excessive filler and allows the patch to expand and contract with the concrete.
  4. Fill the Void Completely. Cut the tip of the filler tube at an angle and use a caulking gun to dispense the material steadily into the crack. Work slowly to prevent air bubbles and ensure the filler makes full contact with both sides of the concrete.
  5. Level It to Perfection. Use a margin trowel or a putty knife to smooth the patch level with the driveway surface. Lightly feather the edges so the patch sits flush with the existing slab.
  6. Protect and Wait. Block off the area with caution tape or cones to ensure no traffic touches the wet filler. Allow the patch to cure for at least 24 to 48 hours, depending on the manufacturer's temperature requirements.