Slab Concrete Crack Repair Caulk

Slab Concrete Crack Repair Caulk creates a flexible, long lasting seal to repair cracks in concrete surfaces. Slab is capable of stretching up to 300% of its cured size to accommodate movement and change in the repaired surface.


Slab® Concrete Crack Repair Caulk is a flexible water-based concrete repair sealant designed for permanent repairs. Slab is perfect for repairing large or small cracks in concrete, brick, or stone including: sidewalks, garages, sheds, driveways, patios and horizontal expansion joints. The elasticity of Slab allows it to move with your concrete due to changes in temperature, shifting soil, moisture and traffic to create a weatherproof seal.

Sashco Slab Concrete Crack Repair Caulk Features & Benefits
• Elastomeric with powerful adhesion—stretches but won’t tear, crack or pull away and will not rip apart the substrate when joints expand.
• Its gray color blends well with concrete and stone to provide a seamless appearance.
• Eliminates the need for repeated repairs.
• Easy to apply, smooth and clean up with water.
• Freeze-thaw stable through 10 cycles.
• Full 10.5 oz. in every cartridge.
• Slab sticks to itself, making repairs easy.
• Stop-flow plunger.

Slab Concrete Crack Repair Caulk Compatible Surfaces:
• Asphalt
• Brick
• Mortar
• Concrete
• Stone
• Stucco
• Wood
• Cinder Block

How to Repair Cracks In Concrete Using Slab:

1. Gather Tools
You’ll Need:
• Slab
• Backer Rod
• Drill-mounted brush or stiff bristled brush for cleaning out the crack.
• Caulk Gun
• Utility knife for opening the caulking cartridge.
• Putty knife or foam brush for tooling.
• Damp rags for clean-up.

2. Clean the Crack
In order to create the strongest bond possible between the caulk and material being repaired. Use the stiff bristled brush or drill-mounted brush to remove all loose debris.

3. Insert Backer Rod
Any crack that is deeper than 1/2″ and wider than 1/4″ needs to be filled with backer rod prior to being caulked to ensure both proper elasticity as well as an efficient amount of caulk.

4. Apply the Caulk
Apply the bead of caulk at least 1/4″ thick but no more than 1/2″ thick. This allows the caulk to stretch correctly.

5. Tool the Caulk
Use a damp foam brush, a putty knife, or your finger to create a smooth, uniform bead and ensure the caulk adhered to the sides of the joint properly.

6. Clean Up
With a damp cloth while the caulk is still wet, use soap and water to clean up excess caulk.