The space between a slab of concrete and the ground is called a ‘void’. A void 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 a void when you walk on the concrete, and you can feel it give under your feet. The obvious signs of a void can be seen. Level Rite Concrete 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 is added to the sides of the concrete slab.