Polyurethane Foam Lifts Sinking Slabs Without Tearing up Your Driveway.

Larger void fills, deep settlement, or restricted access can push higher. Customized Repair Estimate after on-site inspection reflects your scope.

Closed-cell polyurethane foam is inert, hydrophobic, and rated for 50+ year service life in soil. Epp Foundation Repair backs the install with a 5-year written warranty against re-settlement at the treated area. If the lifted section drops below tolerance within the warranty period from a covered cause, Epp re-injects at no charge. Warranty documentation stays with the home for the next owner.

No. A sunken slab will not lift itself, and the void underneath grows over time. Untreated, the symptoms get worse: the tripping edge tears at shoes, the negative slope channels water toward the house instead of away, the void enlarges as soil continues to wash or settle, and adjacent slab sections start to crack from the lateral pull. Epp sets the real number with a free on-site inspection and a Customized Repair Estimate.

Both lift slabs, but the materials differ sharply. Foam is roughly 4 pounds per cubic foot. Light enough that it doesn't re-stress the failing soil column. The cementitious slurry method is roughly 100 pounds per cubic foot. Foam ports are 5/8-inch; mudjacking holes are 1 to 2 inches. Foam cures in 15 minutes; slurry cures in 24 to 48 hours. Epp Foundation Repair does not perform mudjacking. On every job, from a small driveway to a large void fill, Epp's crews use polyurethane foam because the lighter load doesn't re-stress soil that's already failing, and the faster cure gets the slab back in service the same day.

Properly executed lifts almost never crack the slab. Foam injection raises the slab in fractional increments distributed across multiple ports. So the upward force is spread evenly. The risk of cracking goes up sharply on slabs that are already structurally compromised: hairline cracks running corner to corner, slabs broken into multiple pieces, or slabs where rebar has rusted and lost section. During the inspection, Epp identifies slabs that are too far gone for lift and recommends replacement instead.

Surface lift fills the void directly under the slab, but it doesn't address the soil weakness several feet down. Which is often where loess hydroconsolidation or clay shrinkage actually originated. Dave Epp's crews target the mid-soil zone with deeper injection ports on settlement that traces to soil failure at depth. The deeper injection densifies the soil column, not just the surface void. Which is the difference between a slab that holds for 5 years and one that holds for 25.