Concrete Void Filling & Stabilization
A slab can sound solid and still be hollow underneath. Erosion and animal burrows leave voids; we fill them before the concrete breaks.
Downspouts, plumbing leaks, and burrowing animals wash out or dig out the soil under slabs. The concrete bridges the gap for a while, then cracks under load. A hollow sound when you tap the slab is the warning.
We inject polyurethane to fill the void and support the slab from below. Addressing leaks and runoff is still important because ongoing erosion can remove nearby soil. If the slab has already started to settle, we lift it back to grade in the same visit.
Signs it’s time
- Hollow sound when the slab is tapped
- Soil washing out at the slab edge
- Animal burrows along the foundation or stoop
- New cracks in a slab that hasn’t moved
Planning your concrete repair
We look for exposed gaps, signs of soil washout, slab movement, and sources of water near the concrete. A hollow sound alone does not establish the extent of a void. An on-site assessment helps determine the support needed and whether lifting is also appropriate.
When a different repair may be needed
Filling a void does not stop a leaking pipe or redirect a downspout. The source of erosion needs attention to protect the surrounding soil. Stabilization also cannot restore concrete that is already too badly broken to function as a slab.
What affects the cost?
The area of concrete, the amount of settlement, the space beneath the slab, and access to the work all affect the quote. We inspect and measure your project in person, then email a written quote. There is no job minimum, and we do not estimate from photos alone.
Our polyurethane lifting process uses ⅜-inch injection holes and foam weighing about 4 pounds per cubic foot. We discuss the expected lift, patching, and return to use for your particular project before scheduling the work.
Can you stabilize concrete without raising it?
Void filling can support suitable concrete that has not yet noticeably settled. Lifting and stabilization have different goals, so we assess the slab elevation and the missing support before proposing the work. We explain whether the project calls for one or both.
Local service, from assessment to cleanup
Based in Lee’s Summit, our family-owned team serves Blue Springs, Independence, Raymore, Greenwood, Pleasant Hill, Grain Valley, Oak Grove, Lake Winnebago, Lake Lotawana, Lone Jack, Unity Village and the eastern Kansas City metro. Our trained, insured team handles the work in-house. Contact Level Up to arrange a free on-site quote. Office hours are Monday–Friday, 9am–3pm.
Get a free on-site quote
Send a few details and we'll call you to schedule a free quote. No obligation. No pressure to accept.
What happens next
We schedule an on-site visit to inspect and measure your concrete, then email a written quote, usually within 24 hours of the visit. We do not provide estimates from photos. Accept the quote online and we will call you to schedule the work.