1. How does polyurethane foam lifting work?
Polyurethane foam is injected through small access points beneath the slab. As the foam expands, it fills voids, compacts weak soil, and gently raises the concrete back to a level position. It cures within minutes, creating a stable, long-lasting support base.
2. How long does concrete lifting take?
Most projects take one to two hours depending on the size and number of slabs. Because the foam cures quickly, the surface can usually be used immediately after the repair.
3. Is foam lifting better than mudjacking?
Yes. Foam lifting is cleaner, more precise, and far more durable. Polyurethane is lightweight and waterproof, so it won’t wash out or add extra weight to failing soils. Mudjacking uses a heavy slurry that often causes repeat settlement over time.
4. Will the foam break down over time?
No. Structural polyurethane foam is a closed-cell material that does not absorb water, shrink, decompose, or weaken. It is engineered to remain stable for decades and performs exceptionally well in freeze–thaw environments.
5. What causes concrete slabs to sink in the first place?
Concrete typically sinks because of poor soil compaction, erosion from water drainage, freeze–thaw cycles, rodent tunneling, or gradual soil settlement. When the soil loses strength or volume, the concrete above begins to settle.
6. How soon can I use my driveway or sidewalk after lifting?
Almost immediately. The foam reaches full strength within minutes, allowing homeowners to walk or drive on the repaired slab the same day.
7. Can you lift concrete that is cracked?
Yes. As long as the slab is still structurally sound and the cracked pieces can move together, lifting is effective. If the slab is severely broken or deteriorated, replacement may be recommended, and we provide honest evaluations.
8. How large are the drill holes used for injection?
Foam lifting requires very small injection points, typically around 5/8 of an inch—much smaller and less noticeable than mudjacking holes, which can be 1.5 to 2 inches wide.
9. Is polyurethane foam environmentally safe?
Yes. The foam is an inert, closed-cell material that does not leach chemicals into soil or groundwater. It is approved for residential, commercial, and municipal use and is widely used by DOTs.
10. Do you travel outside Wisconsin for concrete lifting projects?
Yes. While based in Wisconsin, we frequently complete lifting and stabilization projects in Florida and other states for homeowners, contractors, and municipalities that require advanced lifting solutions.