What is Polyurethane Concrete Lifting?Using small holes drilled strategically into existing, concrete slabs, we inject light weight polyurethane foam to fill voids and raise concrete back up to its original height. The foam material is precisely injected to control the lifting process and hardens very quickly becoming extremely strong and water impermeable. We will fill voids of any size, stabilize the soil, lift, and support all types of concrete back to its original height. Commercial and residential driveways, sidewalks, basements, patios, garage pads, warehouse floors and commercial ...