Slab Foundation Repair
Underpinning and stabilisation for settling concrete slabs, the dominant foundation type in post-1960s Tallahassee homes
Repair Type
Concrete Leveling and Slab Lifting in Tallahassee
Polyurethane foam and mudjacking to raise sunken driveways, walkways, patios, and garage slabs.
Concrete leveling is the flatwork cousin of foundation repair: driveways, sidewalks, patios, pool decks, garage floors, and porch slabs that have sunk because the soil beneath them washed out or consolidated. In Tallahassee the usual culprit is water, either roof runoff dumping alongside a slab with no gutter to catch it, or the sandy soils south of the Cody Scarp carrying fines away underneath. The repair injects material through small holes drilled in the slab, filling the void and lifting the concrete back to grade. Polyurethane foam is the modern default, light, fast-setting, and unaffected by water; mudjacking with a cement slurry is heavier and cheaper and still has its place. Most residential leveling projects run $900 to $4,500 and finish in a single day.
What the scope covers
- Void identification before injection, so the crew knows whether they are filling a cavity or compressing soft soil
- Polyurethane foam injection through penny-sized ports, cured and load-bearing within minutes
- Mudjacking with cement slurry where the slab is heavy and the budget favours it
- Trip-hazard elimination at sidewalk and driveway joints without replacing the panels
- Slope correction so water runs away from the house instead of pooling against it
- Port holes patched flush with a colour-matched grout, leaving small visible dots rather than a repoured slab
- Honest advice on when a slab is too broken to lift and replacement is the better spend
Where you are changes the answer
Leon County spans three geologic provinces, and the ground under a house on the north side of Tallahassee is not the ground under a house on the south side. The Red Hills clay guide covers the northern half, the karst plain guide covers the southern half, and the main Tallahassee guide puts the whole picture together.
Concrete Leveling anywhere in the county
Someone comes out, takes the elevations, and writes you a price. It costs nothing, and the ground conditions for your specific area are covered on its own page.
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Detail
Questions about concrete leveling
How much does concrete leveling cost in Tallahassee?
Most residential concrete leveling runs $900 to $4,500. Lifting a couple of sunken sidewalk panels or a single driveway section lands at $900 to $1,600. A full driveway apron, a patio, or a garage floor runs $2,000 to $3,500. Larger pool decks and long driveway runs reach $4,500 and up. Polyurethane foam usually prices above mudjacking per square foot but uses far less material and cures in minutes rather than hours.
Foam or mudjacking, which is better?
Foam is the better default for most residential work. It weighs a fraction of a cement slurry, so it does not add load to the same soft soil that caused the settlement, it cures within minutes so the slab is back in service the same day, and it is unaffected by water, which matters in a wet climate. Mudjacking is cheaper per cubic foot and works fine under thick, heavy slabs where the extra weight is not a concern. The drilled ports are also larger with mudjacking, so the patches are more visible.
How long does concrete leveling last?
The lift itself is durable; polyurethane foam does not break down, wash out, or lose volume. What determines the lifespan is whether the cause was fixed. If the slab sank because a downspout has been discharging beside it for ten years, the same water will undermine the same slab again. Leveling paired with a drainage correction lasts; leveling alone repeats.
Can a cracked driveway be lifted, or does it need replacing?
A slab with a few clean cracks lifts fine, and the cracks can be sealed afterwards. A slab that has broken into many small pieces, has crumbling edges, or has spalled through the surface will not lift as a unit and is usually better replaced. A crew that quotes lifting on a slab that is genuinely finished is doing you no favours, and the difference is visible on site in about a minute.
Will I see where the holes were drilled?
Yes, though they are small. Foam injection uses ports around five-eighths of an inch across, patched flush with a grout matched as closely as the existing concrete allows. On a weathered driveway the patches read as faint dots; on a smooth, newer slab they are more noticeable. Mudjacking ports are larger, typically an inch and a half to two inches, and correspondingly more visible.
Adjacent Work
What usually gets quoted alongside it
Foundation problems rarely arrive alone, because they usually share a cause. A house that needs piers on one side very often needs the drainage on that side corrected too, and the second job is what stops the first one repeating.
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Pier and Beam Foundation Repair
Shimming, sistering, and pier rebuilds for the raised crawl space homes in Tallahassee's older neighbourhoods
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Foundation Crack Repair
Sealing and structural stitching for cracks in slabs, stem walls, and masonry foundation walls
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Helical and Push Pier Underpinning
Deep steel pier systems that transfer house loads past the moving soil to competent bearing strata
More on ground conditions around Tallahassee
Find out what is moving under your house
Someone comes out, takes the elevations, walks the drainage, and writes you a price. Ring (850) 391-4290 or send the details through the form.