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Repairing & Sealing Cracks in Concrete
Once a crack in concrete develops due to shrinkage, temperature changes, ground movement or excessive loads, it’s important to seal the crack from water to prevent further deterioration.
When working with cement-based products, always wear eye protection and waterproof gloves. QUIKRETE Concrete Repair, QUIKRETE Gray Concrete Crack Seal or QUIKRETE Self-Leveling Polyurethane Sealant may be used.
Widen the crack using a chisel and hammer to a minimum of ¼ inch and break away any deteriorating concrete (the edges of the crack should be vertical or beveled in an inverted “v”).
Remove loose material with a brush.
Option A: QUIKRETE Concrete Repair
Cut the tip of the nozzle on an angle with a utility knife to match the width of the crack and load into a standard caulk gun.
Slowly draw the gun down the crack, forcing a bead of Concrete Repair caulk deep into the crack.
TIP: Concrete Repair can be tooled with a trowel to match the surrounding surface immediately after placement. It will begin to form a skin in about 20 to 40 minutes and will harden completely in 1 to 2 hours.
Option B: QUIKRETE Gray Concrete Crack Seal
Pour the sealant from the bottle, overfilling the crack slightly to allow for settling and shrinkage.
NOTE: for cracks deeper or wider than ¼ inch, Concrete Crack Seal should be applied in multiple applications, waiting 24 hours between applications.
Option C: QUIKRETE Self-Leveling Polyurethane Sealant
Cut the tip of the nozzle at an angle with a utility knife matching the width of the crack and insert the tube into a standard caulk gun.
NOTE: for cracks or joints over ¼ inch, a Backer Rod should be placed in the crack before applying the sealant.
Move the nozzle slowly along the length of the crack, allowing the sealant to settle.
TIP: this may require an additional application, which should be done immediately so that the two applications will mend into each other.
Excess sealant should be cleaned up immediately with a commercial solvent or a citrus-based cleaner.
- Qt. QUIKRETE Concrete crack seal
10 oz QUIKRETE concrete repair
10 oz QUIKRETE Polyurethane Concrete Crack Sealant
- Qt. QUIKRETE Concrete & Asphalt Cleaner
- Wire brush
- Caulking gun (for caulk tubes)
- Scrub brush
- Safety glasses