Polyjacking, also called concrete leveling, is when experts pump polyurethane foam underneath your sinking slab in order to lift it back into place. This method can be used for sidewalks, patios, driveways, and interior concrete slabs. Here’s how the process works.
Step 1. Dime-sized holes are drilled into your concrete.
Step 2. The polyurethane foam is injected through the holes until it fills the voids beneath your slab.
Step 3. The foam expands and hardens, lifting up your slab back into place.
Once the concrete is leveled, the injection holes are patched, and any excess foam is cleaned off your slab.