That’s right. Polyjacked concrete slabs can be used 15 minutes after the foam cures. Lifting a concrete slab works in three steps.
Step 1: Holes the size of a dime are drilled into the concrete slab.
Step 2: Polyurethane foam is injected through the holes underneath the slab.
Step 3: Lastly, the foam will then expand beneath the concrete, lifting the slab.
Once the concrete is back to the maximum practical level, the injection holes and cracks are patched. Contractors will also clean any excess foam sticking out from under the slab.