What We Do
Lift and Level Sunken Concrete. No Replacement Needed.
Polyurethane concrete raising lifts and levels sunken concrete by injecting expanding foam beneath the slab, restoring it without replacement. Most projects are completed in a few hours. The surface is usable the same day. And it typically costs 50 to 70 percent less than tearing out and pouring new concrete.
The Process
How Polyurethane Concrete Raising Works
Also known as polyjacking or foam jacking, this method fixes uneven driveways, patios, sidewalks, garage aprons, and steps where the concrete has settled but remains structurally sound. Concrete settles over time due to soil erosion, poor compaction, and water movement beneath the slab. Polyurethane foam lifting corrects the problem at the source by filling those voids and raising the concrete back to grade — without demolition.
- Evaluate the slab The settled concrete is inspected to determine why it sank and where lift points are needed. We only take jobs we can do well — if replacement is the right call, we'll say so upfront.
- Drill small injection holes Holes roughly the size of a dime are drilled into the concrete at strategic points. These are significantly smaller than the holes used in traditional mudjacking.
- Inject polyurethane foam High-density, moisture-resistant polyurethane foam is injected beneath the slab. As it expands, it fills voids, stabilizes the soil, and precisely lifts the concrete back to its proper level.
- Patch and clean up The holes are sealed, the area is cleaned, and the concrete is ready for use — typically within hours of the job being completed.
What We See on Jobs
Why Lifting Works — and When It Doesn't
Most homeowners who call us have already been quoted for full replacement. In roughly 70 percent of cases, they don't need it. The concrete is structurally sound — the problem is entirely below the surface, in the soil that shifted or eroded away.
The Twin Cities metro sits on clay-heavy glacial soils that expand when wet and contract when dry. Minnesota's freeze-thaw cycle pushes that movement hard every winter, forming voids beneath slabs season after season. Polyurethane foam fills those voids and holds — it doesn't absorb water, compress over time, or wash away the way mudjacking slurry can.
Lifting isn't right for every job. If concrete is severely cracked, crumbling, or structurally compromised, we'll recommend replacement and won't take a job we can't stand behind.
- Roughly 70 percent of sunken slabs we evaluate are good candidates for lifting — the concrete is intact and the problem is entirely below the surface
- Polyjacking typically costs 50 to 70 percent less than tearing out and replacing the same concrete
- The polyurethane foam cures in about 15 minutes — most surfaces are usable the same day
- Polyurethane foam weighs about 2 lbs per cubic foot, versus 100+ lbs for mudjacking slurry, so it adds no additional load to already-unstable soil
- Most jobs are completed in a single visit, from evaluation to cleanup, in a few hours
Services
What We Lift
We lift and level sunken concrete across all residential surfaces. Select a service below for more detail on what to expect, what it costs, and how to know if your concrete is a good candidate.
Common Questions
Polyurethane Concrete Raising: FAQ
What is polyurethane concrete raising?
Polyurethane concrete raising is a process that lifts and levels sunken concrete by injecting expanding foam beneath the slab, restoring it without replacement. Also known as polyjacking or foam jacking, it is used to fix uneven driveways, patios, sidewalks, garage aprons, and steps where the concrete has settled but remains structurally sound.
Is polyurethane concrete raising permanent?
Yes. The polyurethane foam is water-resistant, chemically stable, and designed to provide long-term support. It does not absorb water, compress, or wash away, making it well suited to Minnesota's freeze-thaw conditions. Ask about specific warranty terms when you schedule your estimate.
How long does polyurethane concrete lifting take?
Most projects take a few hours from arrival to cleanup. The foam cures in about 15 minutes, and the concrete is ready for use the same day. There's no waiting for a new pour to cure and no days of blocked access.
Is polyjacking cheaper than replacing concrete?
In most cases, yes. Polyurethane concrete raising typically costs 50 to 70 percent less than full replacement. Because the existing concrete is reused rather than demolished, the savings grow with the size of the surface — driveways and patios see the greatest cost difference.
What types of concrete can be lifted?
Driveways, patios, sidewalks, garage aprons, and steps with intact, structurally sound slabs are all good candidates. Roughly 70 percent of sunken slabs we evaluate can be lifted rather than replaced. If the concrete is severely cracked or crumbling, we'll tell you that upfront.
How is this different from mudjacking?
Traditional mudjacking injects a heavy cement slurry beneath the slab. That slurry absorbs moisture over time and can break down, especially in Minnesota's climate. Benchmark Concrete Raising uses high-density polyurethane foam, which is lighter, stronger, and moisture-resistant. The injection holes are also smaller, and the foam cures in minutes rather than days.
The Bottom Line
Most Sunken Concrete Doesn't Need to Be Replaced
When concrete settles, the instinct is often to replace it. In most cases, that's the more expensive answer to a problem that doesn't require it. Polyjacking restores safety, corrects drainage, and brings sunken slabs back to level — in a single visit, with no demolition, at a fraction of replacement cost.
We provide free estimates throughout the Twin Cities metro. Call 952-295-0500 or request a quote online to get started.
