Fix a Sinking or Settling Slab
Concrete slabs are used in many areas around homes and buildings, including patios, garages, walkways, and interior floors. When a slab begins to sink or settle, it can create uneven surfaces, cracks, and drainage problems that affect both safety and appearance.
STL Polyjack provides concrete slab leveling using advanced polyurethane foam injection. Our process lifts and stabilizes sinking concrete from underneath—no demolition or replacement—often saving customers up to 50%.
Most slab leveling projects can be completed in just a few hours, and the surface is typically ready to use the same day.
Why Concrete Slabs Sink
Concrete slabs rely on stable soil beneath them for support. Over time, changes in the ground can cause the soil to shift or erode, creating empty spaces below the slab.
Common causes include:
- Soil erosion from rainwater or poor drainage
- Voids forming beneath the slab
- Weak or poorly compacted soil during construction
- Seasonal soil expansion and contraction
- Water washing away soil beneath the concrete
When these conditions occur, the slab loses support underneath and begins to settle. Concrete leveling restores that support by filling voids and stabilizing the soil beneath the slab.
Signs Your Concrete Slab Needs Leveling
Slab settlement usually develops gradually, which means many property owners do not notice the issue right away.
You may need concrete slab leveling if you notice:
- Uneven sections of concrete
- Cracks forming across the slab
- Water pooling in low areas
- Concrete tilting toward a structure
- Gaps forming between slabs
- A noticeable dip or sinking area
If these problems continue to worsen, the slab may settle further and cause additional structural concerns.
Sometimes slab settlement is connected to other concrete problems around the property. If multiple areas are affected, Saint Louis Polyjack also provides driveway leveling, garage floor leveling, walkway and sidewalk leveling, and pool deck leveling. In some situations, filling empty spaces beneath the slab with void filling may also be necessary to restore proper support.
Free Concrete Leveling Estimate
Customers can also send photos of the problem area for a faster quote.
Why Property Owners Choose Saint Louis Polyjack
Serving St. Louis, Sunset Hills, Fenton, Kirkwood, Ballwin, Chesterfield, and surrounding communities.
Our Fix: Polyurethane Concrete Slab Leveling
Saint Louis Polyjack uses a polyurethane foam injection process to lift and stabilize concrete slabs safely and efficiently. Instead of tearing out the slab and pouring new concrete, our method restores support beneath the existing concrete by filling hidden voids and strengthening the soil underneath.
Our process works in three simple steps:
1. Drill Small Access Holes
Small holes are drilled in specific areas of the slab so we can reach the empty space beneath the concrete.
2. Inject Expanding Polyurethane Foam
High-density foam is injected beneath the slab. The material expands to fill voids, stabilize the soil, and gently lift the concrete back into position.
3. Patch the Holes and Finish the Repair
Once the slab is level, the drill holes are patched neatly. Most concrete slabs are ready to use shortly after the repair is completed.
Benefits of Concrete Slab Leveling
Concrete lifting provides several advantages compared to removing and replacing a slab.
Some of the main benefits include:
- Save up to 50% compared to replacement
- Fast repair that usually takes only a few hours
- Minimal disruption to surrounding areas
- Long-lasting stabilization beneath the slab
- Improved drainage and reduced water pooling
- Restoration of a safe, level surface
Instead of demolishing the slab, leveling restores the existing concrete while correcting the underlying problem.
Why Choose STL Polyjack
When concrete starts to sink or settle, choosing the right contractor matters. STL Polyjack brings over a decade of experience and more than 1,200 completed lifts across the St. Louis area. We focus on fixing the root cause—not just the surface—using advanced polyurethane foam injection to lift and stabilize concrete without the cost and disruption of replacement. When you work with our team, you can expect:
- Over a decade of hands-on experience
- 1,200+ concrete lifting projects completed locally
- Polyurethane foam designed for long-term support
- Minimal disruption to your home or business
- Completed in hours, not days, with same-day use
- Honest evaluations and straightforward recommendations
- Repairs backed by a 5-year warranty
Whether the project involves a residential driveway, uneven sidewalk, patio, commercial slab, or structural repair, our goal is to deliver a repair that restores safety, stability, and confidence in your concrete surfaces.
FAQs – Concrete Slab Leveling
Helpful answers about slab settlement, repairs, and how polyurethane lifting works.
Yes. If the slab is structurally sound, polyurethane lifting can raise and stabilize it without removing the concrete. You can learn more about how this works on our concrete leveling process page.
Most slab leveling projects can be completed in just a few hours, making it much faster than replacing the entire slab.
In most cases, the slab can be walked on or used shortly after the repair is completed because the polyurethane foam cures quickly.
Slabs usually sink due to soil erosion, water runoff, or empty spaces forming beneath the concrete. In some situations, void filling is used to restore support under the slab.
Many property owners prefer polyurethane leveling because it uses smaller drill holes and lightweight material that stabilizes the soil beneath the slab. You can read more about the differences on our poly leveling vs mudjacking page.
Yes. The same lifting process can repair driveways, garage floors, walkways and sidewalks, and pool decks if those areas are also experiencing settlement.
Trusted by Leading Businesses
Areas We Serve
STL Polyjack proudly serves homeowners, businesses, and property managers across the St. Charles and St. Louis area. With over a decade of experience, we provide polyurethane concrete leveling, lifting, and structural repair solutions that restore sinking concrete without the cost of replacement. From driveways and sidewalks to warehouse floors and parking lots, we keep properties safe, level, and stable.
Serving St. Louis & Surrounding Communities
- St. Charles, MO
- St. Louis, MO
- Sunset Hills, MO
- Fenton, MO
- Kirkwood, MO
- Webster Groves, MO
- Ballwin, MO
- Chesterfield, MO
- Crestwood, MO
- Arnold, MO
- Manchester, MO
- Des Peres, MO
- Ellisville, MO
- Town and Country, MO
- Oakville, MO
- Affton, MO
- Clayton, MO
- Maryland Heights, MO
- Bridgeton, MO
- Florissant, MO
- University City, MO
If you have sinking or uneven concrete around your property, we can evaluate the issue and recommend the best solution.
We offer free estimates, and you can even send photos for a fast quote.
About Saint Louis Polyjack
Saint Louis Polyjack specializes in polyurethane concrete leveling, lifting, and structural repair throughout St. Louis, MO and surrounding communities. We raise and stabilize sinking driveways, sidewalks, patios, pool decks, warehouse floors, and more using advanced poly foam technology.
Our process is fast, clean, and long-lasting — backed by a 5-year warranty.
Office Location : 12951 Gravois Rd. Ste. 100 St. Louis, MO 63127
Uneven Concrete? Don’t Replace It — Lift It.
Get a Free Estimate Today.
Serving St. Charles, St. Louis, Sunset Hills, Fenton, Kirkwood, Webster Groves, Ballwin, Chesterfield, Crestwood & Arnold.
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