Slab Foundation Repair That Fixes the Cause, Not Just the Crack

Epp Foundation Repair sees three causes account for most failing slab-on-grade homes across the four-state region: original footings poured shallower than today's 42-inch frost depth, expansive prairie clay that swells up to 15% between dry summer and saturated spring, and undetected plumbing-line voids that erode the soil bearing the slab from below. The crack in the kitchen tile is almost never the problem. It's a symptom of one of those three causes working underneath. A slab foundation is a single concrete pour, typically 4 to 6 inches thick, that sits directly on prepared soil with a thickened perimeter beam. Unlike a basement, there's no continuous footing carrying the load down past the freeze line. Which is why slabs built in 1960s and 1970s Lincoln, Omaha, and Kansas City subdivisions, when frost depth code was 24 to 30 inches, are the chronic-callback homes Epp's crews work on most often.

Settlement at the perimeter

When Epp inspectors find one corner of a slab dropped 1 to 3 inches below the rest, the cause is almost always soil consolidation under a shallow perimeter footing. This is most common on the south and west sides of NE and IA homes, where summer drought shrinks loess soils and the perimeter beam follows the clay down. Slab piers driven to load-bearing strata stop it.

Center heave on expansive clay

In Kansas City, Topeka, and St. Joseph MO. Across the expansive prairie clay belt with plasticity index above 30. Epp regularly measures center-of-slab heave up to 2 inches above the perimeter. The clay under the middle of the slab, protected from evaporation, holds moisture and expands; the perimeter clay dries and shrinks. The fix is not lifting the perimeter. It's controlling moisture and, where needed, injecting polyurethane to re-bed the high spots without cracking the slab further.

Plumbing-leak voids

Epp diagnoses voids with a moisture meter, a manometer floor survey to the nearest 0.1 inch, and, when warranted, a small core sample. If a slow plumbing leak is the cause, Epp will not start repair work until a licensed plumber stops the water. Stabilizing a slab over an active leak is wasted money.

Epp Foundation Repair runs a floor-level survey on every slab inspection, plotting elevations on a 4-foot grid. Cracks wider than 1/16 inch get a numbered crack monitor installed; Epp returns at 30 to 90 days to re-measure before recommending repair on a borderline case. Some "settling" slab inspections in the four-state region come back static at re-measurement. Epp tells those homeowners they don't need repair. That's the Integrity Award standard Epp has held with the BBB since 2011 and again in 2016.

Slab piers. Helical or push piers adapted for slab load, driven through small interior openings to load-bearing soil 15 to 30 feet down. Used for measurable settlement that's still active. Polyurethane lift (Mid-soil Injection). Epp's term for polyurethane foam injected mid-depth in the soil column, not just under the slab surface. The expanding foam fills voids, raises the slab in controlled lifts of 1/4 inch at a time, and cures in 15 minutes. Epp can attempt lift but only guarantees stabilization. Settled concrete sometimes won't return to original elevation without cracking. Void-fill foam injection. For slabs that don't need lifting but have washouts underneath (often from old downspout discharge or a fixed plumbing leak). Lower-density foam fills the void and prevents future drop. Carbon fiber or epoxy. For non-structural cracks that have stabilized after the underlying soil issue is fixed. Sealed against moisture and monitored.

Epp Foundation Repair does not pour new slabs for new construction, does not perform plumbing-leak detection or repair, and will not start lift work on a slab with an active leak. Epp also will not promise a settled slab will return to perfectly flat. Soil and concrete don't always cooperate, and saying otherwise isn't fair to the homeowner.

Customized Repair Estimate after on-site inspection reflects your scope.

Epp Foundation Repair offers free inspections across Lincoln, Omaha, Grand Island, Norfolk NE; and St. Joseph MO. Call the closest office to schedule. Most slab inspections take 60 to 90 minutes, including the floor-level survey.