Void Filling
Fill the Void!
An empty space between a concrete slab and the ground is called a ‘void’. This typically occurs next to a sidewalk or walkway leading up to a home. A void can also occur under a concrete patio, porch or driveway. You will sometimes notice these gaps when you walk on the concrete, and you can feel it give under your feet. Raise and Level Hawaii can fix this problem by drilling small 5/8” holes in the concrete and injecting our polyurethane foam into the void to strengthen the concrete and prevent it from cracking and breaking.
Polyurethane Concrete Lifting uses a 2-part, high-density foam which is injected beneath the slab. The foam expands beneath the surface filling voids and raising the concrete. The material does not lose its density. Polyurethane material is lightweight at approximately 2# per cubic foot.
We also recommend adding dirt or landscaping next to and on top of the filled void fill if it is still exposed. UV rays from sunlight can damage the integrity of the polyurethane fill over time.