Get Your Sunken Slab Back to Level — Fast
Slabs that are poured directly on the ground (on grade) can shift, sink, or crack over time. Whether it’s under a shed, sunroom, breezeway, or backyard feature — if it’s sinking, RaiseRite can lift it. We use clean, efficient polyurethane foam to raise on-grade slabs with minimal disruption. Most projects are done in hours, not days.
Why Do On-Grade Slabs Sink?
These slabs are built directly on soil — and that soil can move. Over time, things like erosion, poor backfill, or freeze-thaw cycles cause the ground underneath to settle or wash out. Once the slab loses support, it begins to crack or sink, often unevenly. If ignored, it can lead to drainage problems, structural gaps, or even interior damage in attached spaces.
We also lift driveways, garage floors, walkways, steps, patios, porches, interior floors, and pool decks. Explore all our residential concrete leveling services to see how we can help.
Why Home Owners Trust RaiseRite
- 50+ Years of Experience (Est. 1974)
- 100,000+ Projects Completed
- 5-Year Warranty
- Family-Owned & Operated (3 Generations)
- Fast, Same-Day Results
- Renewable Foam (40% recycled content)
- Virtual Estimates Available – Just snap, upload, and get a quote
We’re not a franchise. We’re your neighbors. And we care about doing the job right.
What Are the Signs You Need Slab Leveling?
On-grade slabs don’t always sink overnight. Here are signs to watch for:
Cracks forming in the middle or edges of the slab
Slab pulling away from adjoining structures or walls
Dips that collect water or feel soft underfoot
Unlevel surfaces in sheds, breezeways, or sunrooms
Doors or windows sticking in nearby structures
Our Fix: Quick, Clean Concrete Leveling with Foam
Step 1) Injection holes are strategically drilled around the areas where the concrete is sunken and requires lifting.
Step 2) Once everything is prepped, and the hose and material are in place, the polyurethane foam is injected through the holes. It expands to fill the space underneath the concrete slab, using the slab itself to drive the foam into the crevices, thereby lifting the concrete back to its original position.
Step 3) Once the concrete is stabilized and lifted to the proper position, the injection holes are filled with new cement, allowing you to use your surface immediately.
Polyurethane concrete raising uses a foam material that is injected under the slab. When the components of the material are mixed, a reaction causes the material to expand. This expanded foam fill any voids beneath the slab and raises the concrete. This material will never lose density, is permanent and weighs only about 2 pounds per cubic foot.
Frequently Asked Questions
We level shed slabs, sunroom slabs, breezeways, outdoor landings, small foundation slabs, and more — as long as they’re poured on grade we can fix it.
Yes — the same innovative foam lifting method is used across all outdoor slab applications. It’s clean, fast, and precise and a proven process our customers have trusted for over 50 years.
Yes — foam lifting still works, and often helps close or stabilize cracks once the slab is supported.
Just clear any large furniture or equipment if possible. We’ll let you know what access we need in advance.
In almost every case, yes. Concrete leveling is a fraction of the cost and requires no messy tear-outs or downtime.
We’re done with most concrete lifting jobs in a few hours. You can use your concrete again immediately!
Yes — all residential slab leveling comes with our standard 5-year warranty.
Still have questions? Check out our full FAQ page for more answers.
We Keep It Simple
If your slab is sinking, you don’t need to rip it out or start over. We lift it with precision foam and get the job done fast — so you can get back to using your space safely and confidently.
What Our Customers Have to Say
Why Choose RaiseRite
Serving Wisconsin since 1974
Over 50 years of experience lifting and leveling concrete across Wisconsin and beyond.
100,000+ Jobs Completed
We’ve helped more families and businesses fix their concrete than anyone else in the state.
$20M+ Saved vs. Replacement
Our concrete lifting service has saved customers millions by avoiding tear-outs and full replacements.
5-Year Warranty
We stand behind every concrete leveling job with a real warranty — no fine print, just peace of mind.
Family-Owned & Operated
Three generations working together to deliver honest work and long-lasting results.
We Train the Industry
Contractors across the country come to us to learn — when you hire RaiseRite, you get the team that sets the standard.
We Manufacture the Tools
We build the same polyurethane foam and equipment used by top pros across the industry.
Residential, Commercial & Municipal Work
From homes to highways, we handle projects of all sizes — safely and professionally.
Proudly Based in Wisconsin
We’re a local team using American-made tools and doing the job right, every time.
