Expansive soil, particularly bentonite clay soil, can be found throughout Colorado. It’s not feasible to replace all the soil under and around your home or your property’s concrete, but there is something professionals can do to stabilize problematic concrete and the soil beneath it. PolyRenewal polyurethane injections work by being pumped under sinking concrete slabs. This lightweight foam expands to fill voids between the soil and concrete slabs, lifting the concrete along the way. Not only will the concrete be stabilized, but so will the underlying soil as well.