Concrete Service
Concrete Leveling in Sioux Falls, SD
Concrete slabs on grade are only as level as the soil beneath them. When that soil settles, washes out or was never compacted properly, the slab follows it down — and you get trip hazards, ponding water, and flatwork that now slopes toward the house instead of away from it. Lifting the slab back is usually cheaper and faster than replacing it.
Signs a slab needs leveling
- A trip lip where two slab sections have separated vertically.
- Water ponding on a walk, patio or driveway after rain instead of draining off.
- A patio or apron now sloping back toward the house, directing water at the foundation.
- A garage slab that has dropped away from the foundation wall or the apron.
- A hollow sound when a slab is tapped, indicating a void beneath.
- Doors or gates that catch on a settled section of walkway.
- Steps or a stoop that have tilted or pulled away from the house.
- Slab sections that rock or move underfoot.
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Settled concrete walkway section with a visible trip lip against the adjoining slab.
Why slabs settle
- Poorly compacted fill placed beneath the slab during construction.
- Water washing soil out from under the slab, often from a downspout discharging onto or beside it.
- Erosion along the edge of a driveway or walk where surface water concentrates.
- Freeze-thaw cycling heaving and dropping a slab over successive winters.
- Consolidation of soft or organic soils under sustained load.
- Utility trenches backfilled without adequate compaction, leaving a soft line under the slab.
- Tree roots drying and shrinking the soil under one side of a slab.
- Heavy vehicle loads on a driveway that was designed for lighter use.
Polyurethane foam injection
Small holes, typically around the diameter of a coin, are drilled through the slab. A two-part polyurethane is injected beneath, where it expands, fills the void, densifies loose soil and lifts the slab in a controlled way as the technician watches the elevation.
The foam is very light, so it adds almost no load to soil that has already proven it cannot carry what is on it. It cures within minutes, so the slab can usually be used again the same day. The holes are small and patched flush.
The trade-off is cost per unit of lift, which is generally higher than mudjacking. For driveways, garage floors and anywhere that needs to return to service quickly, it is usually worth it.
Mudjacking
Mudjacking, or slabjacking, pumps a cement-and-soil slurry through larger holes drilled in the slab. The slurry fills the void and hydraulic pressure raises the slab.
It generally costs less per square foot in material terms, and it has a long track record. The downsides are the larger and more visible patches, the substantial weight of the injected material, and a longer cure before full loading.
That added weight matters. Where the settlement was caused by weak soil, placing a heavy slurry on that same soil can contribute to a repeat settlement. Where the void came from a washout over sound soil, that concern is much smaller.
When to replace instead of lift
Leveling repositions a slab. It cannot repair one. Replacement is the better decision when the concrete is extensively cracked, crumbling, spalled or broken into multiple pieces, because lifting fragments simply produces a fragmented slab at a new elevation.
It is also the better decision when the slab is at the end of its life, when the surface has deteriorated from de-icing salts, or when the drainage design was wrong from the start and needs to be re-laid rather than repositioned.
A slab that is structurally sound but sitting at the wrong elevation is the ideal leveling candidate. That distinction is the one to make before comparing prices.
Fix the water, or do it again
Most residential slab settlement in this area is water-driven: a downspout discharging beside a walk, surface flow concentrating along a driveway edge, or a failed drain washing fines out from beneath a patio.
Lifting the slab without addressing that water restores the elevation and leaves the mechanism running. Ask the contractor what they observed about drainage around the slab and what they recommend, and treat the answer as part of the job rather than as an aside.
Side by side
| Consideration | Polyurethane foam | Mudjacking |
|---|---|---|
| Injection hole size | Small, roughly coin-sized | Larger, more visible patches |
| Material weight | Very light | Heavy cement slurry |
| Cure and return to service | Minutes; often same-day use | Longer before full loading |
| Relative cost | Higher per unit lift | Generally lower |
| Risk on weak soil | Adds negligible load | Adds load to soil that already settled |
| Best fit | Driveways, garage slabs, quick turnaround | Voids over sound soil, budget-driven jobs |
How a leveling job runs
Step 1
Assessment
Elevation differences are measured, the void is identified, slab condition is judged, and the drainage cause is traced.
Step 2
Layout and drilling
Injection points are laid out to give even lift, and holes are drilled through the slab.
Step 3
Injection and lift
Material is injected in stages while the slab elevation is monitored, so the lift is gradual and even rather than concentrated.
Step 4
Verification
Final elevations and slope are checked, including that water now drains away from the structure.
Step 5
Patching and cleanup
Holes are filled flush and the area is cleaned. Joints may be sealed to keep water out of the repair.
Not sure what you're looking at? Get it assessed.
Describe the symptoms and send photos. You'll get an assessment of what is likely happening and what should be measured before anyone quotes a repair — across Sioux Falls and Southeastern South Dakota.
What drives the price
- Square footage of slab being lifted
- Amount of lift required and the volume of void to fill
- Polyurethane foam or cement slurry
- Slab thickness and reinforcement
- Access for equipment and hose runs
- Number of separate slab sections involved
- Any joint sealing or crack repair included afterwards
- Associated drainage corrections
Before you sign anything
Questions worth asking any contractor
- Is this slab sound enough to lift, or should it be replaced?
- What caused the settlement, and what will stop it happening again?
- Foam or slurry, and why that choice for this slab?
- How much lift are you targeting, and what slope will the slab have when finished?
- How many injection points, and how visible will the patches be?
- When can the slab carry normal traffic again?
- What warranty applies, and does it cover re-settlement?
Sioux Falls, SD
Slab settlement in Sioux Falls
Freeze-thaw cycling is hard on exterior flatwork here. Water beneath a slab that freezes and expands lifts it, and when the soil thaws and consolidates the slab drops — often not back to where it started. Repeated over several winters, that produces the classic stepped walkway.
De-icing salts used through the winter attack the concrete surface itself. A slab with widespread surface scaling is a replacement candidate rather than a leveling candidate, whatever its elevation.
Driveway aprons and garage slabs are frequent problems locally because they sit on backfill against the foundation, which is the least well-compacted soil on most sites.
A patio or walk that has settled toward the house is worth treating with some urgency, because it is now delivering surface water directly to the foundation — which is how a cosmetic trip hazard turns into a wet basement.
See the communities we coverCommon questions
Concrete Leveling questions
How long does concrete leveling last?
It lasts as long as the soil beneath stays stable, which is why identifying and fixing the water source matters more than the injection material. Where the cause is corrected, the repair is long-lived; where an active washout continues, any method will settle again.
Is concrete leveling cheaper than replacement?
For a sound slab that is simply out of position, it is typically a fraction of the cost of removing and repouring, and it is far faster. For a slab that is broken up or surface-deteriorated, replacement is the better value because leveling cannot repair the concrete.
Can any concrete be lifted?
Structurally sound slabs can be. Slabs that are extensively cracked, crumbling or broken into multiple pieces cannot be lifted as a unit and are replacement candidates.
How soon can I drive on a lifted driveway?
Polyurethane cures within minutes, so same-day use is normal. Cement slurry requires a longer cure before full loading, and the contractor should give you a specific time before leaving.
Will the injection holes be visible?
Foam injection holes are small and patch reasonably discreetly, though on decorative or stamped concrete they will be noticeable. Mudjacking holes are larger and more obvious. Ask to see photographs of finished work on similar concrete before deciding.
Related reading
Foundation Settlement Repair
When it is the house rather than the flatwork that has moved.
Basement Waterproofing
Surface drainage corrections that stop slabs washing out.
Foundation Inspection
Checking whether settled flatwork is a symptom of something larger.
Foundation Repair Estimate
Comparing bids and spotting scope differences.
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