1. First, a series of 5/8" holes are drilled in an off-set pattern.
2. A two-part resin-based specialized polyurethane foam is injected into each drilled hole leaving time for the foam to expand, making sure to fill all voids until the concrete is then lifted back to original height. 
3. Once the concrete settles, existing voids are perfectly filled and the concrete panel is completely supported. The solid, dense polyurethane foam material is unaffected by water eliminating future water issues. After our work is completed, the concrete can be used immediately with no down time. The holes are then filled with high-density cement grout and finished to match the existing concrete.