If you’ve got uneven concrete around your home, you’ve probably heard about polyurethane concrete raising, but what is it, really?
In simple terms, it’s a modern way to lift and level sunken concrete without tearing it out. Instead of replacing slabs, contractors inject a specialized foam underneath them. As the foam expands, it fills empty spaces and gently raises the concrete back into place.
At Acme Concrete Raising & Repair, we use this method because it’s fast, precise, and built to last, especially in Illinois conditions.
How the Foam Actually Works
The material used isn’t just any foam; it’s a high-density, two-part polyurethane designed for structural support.
When the two components mix at the injection point, they react almost instantly. The liquid turns into foam and expands rapidly, reaching a volume 20–30 times its original volume.
As it expands, it fills voids beneath the slab and applies controlled pressure, lifting the concrete evenly. Once cured, the foam becomes rigid and strong, with compressive strength capable of handling heavy loads from vehicles and foot traffic without breaking down.
What the Process Looks Like
The process is straightforward and much less invasive than most people expect.
1. Inspection and planning
We start by evaluating the area and identifying where the concrete has settled. Laser levels help map out exactly how much lifting is needed.
2. Drilling small access holes
Tiny holes, about the size of a dime, are drilled into the slab in key locations. These allow access beneath the concrete without damaging the surface.
3. Foam injection
The polyurethane is injected through those holes. Within seconds, it begins expanding and lifting the slab.
4. Careful leveling
We monitor the lift in real time to make sure everything comes up evenly and matches the surrounding surface.
5. Patching and cleanup
Once the slab is level, the holes are patched to blend in with the existing concrete, and the area is cleaned up.
Most surfaces are ready to use within 30 minutes.
Why It’s Better Than Mudjacking
Older methods like mudjacking use a heavy slurry mixture to lift concrete. While it works, it comes with some drawbacks.
That material is much heavier, which can actually contribute to future settling. It’s also more vulnerable to water erosion, something that matters in Illinois, where rain and freeze-thaw cycles are common.
Polyurethane foam, on the other hand, is lightweight but strong. It doesn’t wash out, it fills smaller voids more effectively, and it cures much faster. That means a longer-lasting repair with less downtime.
Built for Illinois Conditions
Concrete problems in Northern Illinois are often caused by shifting soil, moisture changes, and freezing temperatures.
Polyurethane foam holds up well in these conditions. It resists water, tolerates temperature swings, and helps stabilize the soil beneath the slab.
That’s why it’s commonly used not just for residential projects, but also in roads, highways, and other heavy-duty applications.
Time and Cost Advantages
One of the biggest reasons homeowners choose concrete raising is how efficient it is.
Most jobs are completed in just a few hours, and the area can usually be used the same day. There’s no need for demolition, hauling debris, or waiting days for new concrete to cure.
In terms of cost, raising typically comes in at 50–70% less than full replacement, making it a practical solution for many properties.
Frequently Asked Questions
Is this the same as spray foam?
No. This is a specialized, high-density material designed specifically for structural lifting, not insulation.
How quickly does it harden?
The foam expands within seconds and usually reaches full strength in under 30 minutes.
Will I see the holes afterward?
The holes are small and patched to match the surface, so they’re usually barely noticeable.
Can this be done in cold weather?
Yes. The process works in a wide range of temperatures, making it suitable for Illinois climates.
How long does it last?
When installed properly, polyurethane lifting can last for decades. We also back our work with a 10-year warranty.
Serving Northern Illinois Homeowners
Acme Concrete Raising & Repair proudly serves Kane County, Lake County, and the greater Chicago area, including St. Charles, Algonquin, Crystal Lake, and Palatine.
If you’re dealing with sinking or uneven concrete, polyurethane raising offers a fast, reliable way to fix it without the hassle of replacement.
📞 Call (815) 264-2200 today for a free estimate and see how this process can restore your concrete quickly and effectively.