When the Gwynedd Train Station in Ambler, PA. noticed some sinking and settling concrete slabs they decided to contact Quality 1st Contracting for a FREE Estimate on the PolyLEVEL Polyurethane System. PolyLEVEL is a two-part urethane that, when combined, expands into a waterproof, rigid foam that is used to fill voids, stabilize slabs, and lift concrete. The installation of PolyLEVEL began by drilling penny-sized injection holes into the concrete slab.The polyurethane then lifted the sunken concrete back to its original elevation.