How Epp Foundation Repair lifts concrete with polyurethane foam

Polyurethane Foam Injection: how it works and when it's the right call.

Epp Foundation Repair drills injection ports through the slab, typically about 5/8 of an inch across, spaced to match the pattern of settlement. A two-part polyurethane is pumped through those ports and mixed at the point of injection. The components react and expand quickly, filling the void beneath the slab first and, where the void profile calls for it, continuing to fill mid-soil rather than stopping at the surface. As the foam expands it generates lift, and a technician monitors the slab's elevation with a laser level throughout the process rather than estimating by eye. Injection moves between ports in a sequence set by the settlement pattern, so the slab rises evenly instead of tilting or overstressing one section. Once the target elevation is reached, injection stops, the ports are patched with a compound matched to the surrounding concrete, and the area is cleaned. The foam itself cures quickly, which is why a driveway, sidewalk, or patio lifted with PolyLift concrete leveling is typically ready for foot and vehicle traffic again the same day, without the extended drying and hardening period a heavier fill material would require. Polyurethane foam injection is the right fit when the slab itself is structurally sound and the problem is lost support underneath it. It is not the answer for concrete that is already broken into multiple pieces or badly deteriorated; Epp says so at the inspection rather than injecting foam under a slab that needs replacing instead.