Stabilize a Settled Slab Foundation With Mid-Soil Foam Injection

It depends on how far the slab has settled, how much of the foundation is affected, how far the foam must reach, and whether piers are needed alongside it. Epp does not quote foam injection without probing the bearing soil first, because a price is meaningless if the foam cannot hold. A Customized Repair Estimate after the on-site inspection sets the figure for your home.

Epp Foundation Repair warrants the PolyLift installation for five years from substantial completion against failure of the installed foam to perform its lifting or stabilization function, when that failure is due solely to defects in materials or workmanship. Levelness and horizontal movement are not guaranteed. The full terms are on the Epp warranties page.

The void under the slab can grow while the water or consolidating soil that started it keeps working, and the settled section can tilt further. Cracks can widen, floors slope toward the low side, and over time the joint at the garage slab can pull apart. Waiting also leaves the cause in place, whether that is a leaking line or a downspout at the foundation.

Foam lifts light structural loads: a slab foundation, a basement or garage slab, and shallow footings that have lost the fill beneath them. It is not the tool for a house whose footings have dropped onto failing soil; that load needs helical or push piers driven to bearing strata below the active soil, with foam used only to fill what remains. Stabilization is guaranteed and lift is attempted. Epp recommends piers when the structure itself has dropped and foam when the slab has settled onto soil that is still serviceable.

Mid-soil injection is Epp's term for placing the foam in the soil column beneath the slab, within the roughly 4-foot reach of the equipment, rather than only at the slab-to-soil interface where many surface installations stop. In the loess and glacial till of eastern Nebraska and western Iowa the soft layer often sits below the surface layer, so a surface fill leaves it untouched. Mid-soil injection under a slab foundation fills the void and supports the column down to the soil that holds.

No. Foam injection supports the slab and stabilizes the soil; it does not erase cracks that the settlement created. They may narrow as the slab moves back toward plane, but they stay visible and are sealed as a separate step afterward. Epp is direct about this on the first visit so nobody is surprised when the floor is supported but the crack lines remain.