How to Repair Concrete Cracks

1. Why Do Concrete Cracks Occur?

Concrete cracks due to several reasons:

• Shrinkage: As concrete cures, it loses moisture and shrinks, leading to hairline cracks.

• Temperature Changes: Expansion and contraction due to temperature fluctuations can cause cracking.

• Heavy Loads: Excessive weight or traffic can create stress cracks in the concrete.

• Improper Installation: Poor installation or lack of control joints can lead to cracking over time.

2. Types of Concrete Cracks

• Hairline Cracks: Small, superficial cracks that don’t affect structural integrity.

• Structural Cracks: Larger cracks that can compromise the stability of the structure.

• Expansion Cracks: Cracks caused by the expansion and contraction of the concrete due to temperature changes.

• Settlement Cracks: Occur when the ground beneath the concrete shifts or settles.

3. Tools and Materials Needed

• Tools:

  • Wire brush or grinder

  • Chisel and hammer

  • Caulking gun

  • Putty knife or trowel

  • Utility knife

• Materials:

  • Concrete crack sealant (e.g., QUIKRETE Concrete Crack Seal)

  • Concrete patching compound

  • Backer rod (for deeper cracks)

  • Cleaner or degreaser

4. Preparing the Crack

• Clean the Crack: Remove dirt, debris, and loose concrete using a wire brush or grinder. Use a vacuum or blower to remove dust.

• Widen the Crack: Use a chisel and hammer to widen the crack slightly to create a clean edge for better adhesion.

• Clean Again: Wipe the crack with a damp cloth or cleaner to remove any remaining dust or grease.

• Insert Backer Rod: For deeper cracks (over 1/4 inch), insert a backer rod to fill the gap and prevent the sealant from sinking.

5. Applying Concrete Crack Sealant

• Shake the Bottle: Shake the bottle of concrete crack sealant to mix the contents thoroughly.

• Apply the Sealant: Cut the nozzle at a 45-degree angle and apply the sealant along the crack, slightly overfilling it.

• Smooth the Surface: Use a putty knife or trowel to smooth the sealant and ensure it’s level with the surrounding concrete.

• Let it Dry: Allow the sealant to dry according to the manufacturer’s instructions before walking or driving over the repaired area.

6. Using Concrete Patching Compound (For Larger Cracks)

• Mix the Compound: Mix the concrete patching compound according to the manufacturer’s instructions.

• Apply the Patch: Use a trowel to fill the crack, pressing the compound firmly into the gap.

• Smooth and Level: Smooth the surface with a trowel and level it with the surrounding concrete.

• Curing Time: Allow the patch to cure fully before applying any sealer or paint.

Need Professional Help?

Repairing concrete cracks can be a challenging task, especially for larger or structural cracks. If you need professional assistance, contact ProHands Handyman. We provide expert concrete repair services to restore the look and integrity of your surfaces.

📞 Call or text: 818-401-7766
📍 Serving Glendale, Burbank, Pasadena, and surrounding areas.

Contact us today for a free estimate and professional repair!