Fix Cracked or Uneven Concrete Floors
Uneven concrete floors can cause serious problems inside homes and commercial buildings. When a slab settles or shifts, it can create cracks, sloping floors, and gaps along walls or door frames. These issues can affect safety, damage flooring materials, and lead to further structural concerns if the problem continues.
STL Polyjack provides concrete floor 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 repairs can be completed in just a few hours, and the surface is typically ready to use the same day.
Why Concrete Floors Sink
Concrete floors rely on stable soil beneath the slab for support. When the ground underneath shifts or erodes, empty spaces can form beneath the concrete.
Common causes of sinking concrete floors include:
- Soil settlement beneath the slab
- Voids forming due to soil erosion
- Poor soil compaction during construction
- Water intrusion weakening the soil
- Natural ground movement over time
When the soil beneath the slab loses support, the concrete above it begins to settle. Concrete leveling restores stability by filling the voids and strengthening the soil beneath the slab.
Signs Your Concrete Floor Needs Leveling
Settlement can happen slowly, which means uneven floors are often not noticed until the issue becomes more obvious.
You may need concrete floor leveling if you notice:
- Sloping or uneven interior floors
- Cracks forming across the slab
- Gaps between the floor and walls
- Doors that stick or no longer close properly
- Flooring materials separating or shifting
- Low spots where water collects
If these problems continue, the slab may settle further and cause additional damage to the structure.
Sometimes interior slab settlement is connected to other concrete issues around the property. If multiple surfaces are settling, Saint Louis Polyjack also repairs driveway leveling, walkway and sidewalk leveling, garage floor leveling, and pool deck leveling. In some cases, interior slab settlement is caused by empty space beneath the concrete, which may require void filling 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 Floor Leveling
Saint Louis Polyjack uses a polyurethane foam injection process to lift and stabilize concrete floors safely and efficiently. Instead of breaking out the slab, our method restores support beneath the 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 through the slab so we can reach the empty space beneath the concrete.
2. Inject Expanding Polyurethane Foam
High-density foam is injected beneath the floor. The material expands to fill voids, stabilize the soil, and gently raise the slab back into position.
3. Patch the Holes and Finish the Repair
Once the slab is level, the drill holes are patched neatly. Most concrete floors are ready to use shortly after the repair is completed.
Benefits of Concrete Floor Leveling
Concrete lifting offers several advantages compared to removing and replacing a floor slab.
Some of the main benefits include:
- Save up to 50% compared to replacement
- Fast repair that often takes only a few hours
- Minimal disruption to the building
- Long-lasting stabilization beneath the floor
- Reduced cracking and improved structural support
- Restoration of a level, stable surface
Instead of demolition and reconstruction, leveling restores the existing slab 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 Floor Leveling
Clear answers about interior slab settlement, repair methods, and how concrete lifting works.
Yes. If the slab is structurally sound, polyurethane lifting can raise and stabilize the concrete without removing it. You can learn more about how the repair works on our concrete leveling process page.
Most interior concrete floor leveling projects can be completed in just a few hours depending on the size of the slab.
Concrete floors are typically ready to use the same day because the polyurethane foam cures quickly and provides strong support beneath the slab.
Interior concrete floors usually sink due to soil settlement, water erosion, or voids beneath the slab. In some situations, void filling helps restore the support needed beneath the concrete.
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 polyurethane lifting method can repair driveways, walkways and sidewalks, patios, and pool decks when those surfaces begin to settle.
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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