How to Control Cracks in an Elevated Concrete Slab

Cracked concrete slabs can cause significant damage to a home by allowing moisture and insects to pass through into the interior. This causes mold and can create more destruction than just the original crack. You can fix the crack yourself and stop it from spreading with the proper adhesives. Once fixed, the crack will be almost as solid as new, and the reinforcement will prevent further cracking.

Surface ports
Epoxy adhesive paste
Putty knife
Polyurethane foam with syringe
Hammer

Instructions

- 1
  Install surface ports into the cracks 1 inch apart at a ratio of one for every 1-inch depth of the concrete slab. Press the surface ports into the crack. These ports allow the adhesive to be easily applied to the back of the crack.
- 2
  Apply an epoxy adhesive paste over the crack with a putty knife. Apply it so it locks the surface ports into position and is 1/4-inch in thickness. Allow it to cure for 45 minutes.
- 3
  Inject polyurethane foam into each surface port with the syringe that comes with the foam. Start at the lowest port. Polyurethane foam is ideal for elevated slabs because it cures quickly and won't ooze out of the crack as it expands and cures.
- 4
  Remove the ports by knocking them with a hammer to loosen them then pulling them out of the slab.

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