Settling Foundation — Tallahassee, FL

Signs Your Foundation Is Settling

Homeowners usually call us after they spot a crack in a wall or a door that won't close. But there are subtler clues we look for on every inspection. Check the corners of your windows and doors for diagonal cracks — these often point to differential settlement, where one side of the house sinks faster than the other. Gaps between the top of your baseboards and the drywall are another tell that the floor is tilting.

Outside, look at the brick or siding. A horizontal crack near the bottom of a wall, or a stair-step crack in brick mortar, suggests the foundation is pulling away from the soil. We've also seen porches and stoops that have separated from the main house by an inch or more. If your floors feel springy or you can see a visible slope in a room, the settlement has likely been going on for years.

How We Diagnose Settling Foundations

Our crew starts with a thorough walkaround, inside and out. We measure the slope of the floor with a digital level and check for cracks that are active — meaning they've changed width in the past year. We look for signs of previous repairs, like patched cracks that have reopened, because those tell us the foundation is still moving.

Next, we drill small test holes near the foundation edge to see what's going on with the soil. We look for voids, moisture content, and the depth of the bearing layer. We also check the gutter downspouts and grading around the house — poor drainage is often a contributor. Once we have a clear picture, we can recommend the right repair method, whether that's mudjacking or polyurethane foam injection.

Our Repair Method: Polyurethane Foam Injection

When the slab has settled only a few inches and the concrete is still in good shape, we use high-density polyurethane foam injection. This is a low-pressure process where we drill dime-sized holes through the slab and inject expanding foam directly into the voids. The foam lifts the slab back to level within minutes, filling every cavity as it expands.

We use a specialized injection rig that meters the foam precisely, so we don't over-lift or put pressure on utility lines. The foam itself is waterproof and won't degrade over time, unlike soil that can wash away again. For deeper voids or where the slab has separated into pieces, we may switch to a cement-based slurry pump for mudjacking — that's our slower, heavier option. But foam is our go-to for most residential jobs because it's fast, clean, and keeps the concrete intact.

What Mudjacking Costs and What Drives the Price

For slab leveling by mudjacking, our pricing runs between $3 and $6 per square foot. The final number depends on how many square feet need lifting, how deep the voids are, and how accessible the areas is. A small patio might cost a few hundred dollars; a whole house slab can run into the thousands.

We also look at the condition of the concrete. If there are wide cracks or broken sections, we may need to patch those first or recommend concrete sealing to prevent moisture from getting under the slab again. Crack repair is often done alongside the leveling for a complete fix. And because Tallahassee sees medium hurricane and storm exposure, we factor in the possibility of water intrusion that could worsen settling — that's one more reason to act before hard weather hits.

Local Soil and Permit Considerations in Tallahassee

The clay soils here in the panhandle are notorious for shrinking and swelling with the seasons. That means a foundation that's stable in the dry winter may start settling in a wet spring. We've seen homes built on fill dirt from old construction sites settle twice as fast as those on native soil. Our crew always checks the soil type during the estimate and adjusts the injection pressure and foam density accordingly.

As for permits, most foundation leveling jobs in Tallahassee require a building permit from Leon County. We handle that paperwork — it's part of our service. We also coordinate with structural engineers if the settlement is severe enough to affect load-bearing walls. And we always make sure our repairs meet the current building code, so you have peace of mind when it comes time to sell.