Is polyurethane concrete raising the same as replacement?

No. Polyurethane concrete raising lifts and supports existing concrete. Replacement removes the old concrete and installs new concrete.

How long does foam concrete raising take?

Many residential concrete raising projects can be completed in a single visit, depending on the number of slabs, site access, and project complexity.

Can cracked concrete be lifted?

Sometimes. Small, stable cracks may still allow the slab to be raised, but severely broken, crumbling, or structurally failed concrete may need replacement.

Will concrete raising fix water pooling?

It can improve pitch and drainage when settlement is part of the problem. Long-term results also depend on addressing the cause, such as downspouts, grading, or erosion.

Do I need to replace my whole sidewalk if one panel is uneven?

Usually not if the panels are still structurally intact. Targeted concrete lifting can often restore safer transitions with less disruption than replacing the entire walkway.

What measurement makes a sidewalk edge a concern?

The U.S. Access Board explains that changes in level above 1/4 inch generally require treatment, with beveled changes allowed up to 1/2 inch under specific slope limits.

What if the slab cannot be made perfectly level?

A trustworthy contractor should explain what is realistic before work begins. Final results depend on slab condition, surrounding concrete, obstacles, and how the slab responds during lifting.

What's the Better Choice? Concrete Leveling or Full Slab Replacement

Jun 10

Written By Tate Carlson

Concrete leveling is almost always the better choice when a slab has sunk or tilted but is otherwise structurally sound. It costs significantly less than full replacement, takes a fraction of the time, and produces a result that lasts just as long when done correctly.

Concrete leveling typically costs 50-75% less than tearing out and replacing a slab
A lifted slab is usable within hours - replacement requires days of cure time
The underlying soil problem, not the concrete itself, is what causes sinking - leveling addresses that directly

Why Sunken Concrete Usually Doesn't Need to Be Replaced

When a concrete slab sinks, the slab itself is rarely the problem. The problem is what's underneath it - soil that has eroded, compressed, or washed away over time. In the Twin Cities, freeze-thaw cycles are a major driver. Water gets under a slab, freezes, expands, and slowly works the concrete out of position. Clay-heavy soil, which is common throughout the metro, also compresses under load and shifts with moisture changes.

Full replacement tears out the old concrete and pours new - but if the soil conditions aren't corrected first, the new slab will sink too. Leveling fixes the root cause by filling the void and stabilizing the base.

What Concrete Leveling Actually Does

Benchmark uses polyurethane foam injection to lift sunken slabs. Small holes - roughly the diameter of a dime - are drilled through the concrete. Foam is injected underneath, expands to fill voids in the soil, and lifts the slab back to its original position. The holes are patched, and the surface is ready to use within a couple of hours.

This is different from traditional mudjacking, which injects a cement-and-soil slurry under the slab. Mudjacking works, but the slurry is heavy, adds load to already compromised soil, and takes much longer to cure. Polyurethane foam is lightweight, sets fast, and doesn't add stress to the base.

When Replacement Is Actually the Right Answer

Concrete leveling is not the right solution for every situation. Full replacement makes more sense when:

The slab is crumbling, spalling, or has widespread structural damage
The concrete has broken into multiple pieces and can't be raised as a unit
Drainage or grading needs to be corrected underneath - something that can only be done with the slab removed
The slab is extremely old and near the end of its useful life regardless

If the slab is fundamentally intact and the problem is position rather than condition, leveling is almost always the more practical choice.

How to Know Which Option Is Right for Your Slab

The starting point is an honest look at the concrete itself. If it's one piece (or a few large, stable pieces), still solid underfoot, and the issue is that it has dropped or tilted - that's a leveling candidate. If it's cracked in multiple directions, hollow-sounding across large sections, or physically deteriorating, replacement is worth considering.

A site visit takes the guesswork out of it. Benchmark evaluates sunken concrete throughout the Twin Cities and will tell you directly whether leveling makes sense - or whether it doesn't.

Frequently Asked Questions

How long does concrete leveling last?

Polyurethane foam leveling typically lasts 10-15 years or longer when the soil conditions are stable. The foam itself doesn't break down or wash away the way mudjacking material can. In areas with significant freeze-thaw activity - like the Twin Cities - some slabs may shift again over time, but a leveled slab generally performs as well as new concrete in the same conditions.

Does concrete leveling work on driveways?

Yes. Driveways, garage aprons, sidewalks, patio slabs, and steps are all common candidates for foam leveling. The process works on any concrete surface where the slab is intact and the issue is settling or sinking rather than structural damage.

How much does concrete leveling cost compared to replacement?

Concrete leveling typically costs 50-75% less than full slab replacement. The exact difference depends on the size and accessibility of the slab, but for most residential jobs the savings are significant. Replacement also adds the cost of disposal, formwork, and extended cure time - costs that leveling avoids entirely.

Will the drill holes be noticeable after the job?

The injection holes are small - about the size of a dime - and are patched with a cement-based filler after the lift is complete. On older concrete, the patches blend in well. On newer or decorative concrete, there will be some visible patching, though it's minor compared to the alternative of a full tear-out.

How soon can I use my driveway or sidewalk after leveling?

Polyurethane foam cures quickly. Most surfaces are ready for foot traffic within 15 minutes and vehicle traffic within a few hours of the job being completed. This is one of the clearest advantages over replacement, which requires concrete to cure for several days before it can handle load.

What causes concrete to sink in the first place?

The most common cause is soil settlement or erosion beneath the slab. In Minnesota, repeated freeze-thaw cycles wash fine soil particles away over time, creating voids that the slab eventually drops into. Clay soil, poor original compaction, and water intrusion from downspouts or grading issues can all accelerate the process.

Is concrete leveling better than mudjacking?

For most residential applications, polyurethane foam leveling outperforms mudjacking. Foam is lighter - so it doesn't add stress to already compromised soil - cures faster, and holds up better over time. Mudjacking uses a heavy cement-and-soil slurry that can shrink or wash out as it ages. Benchmark uses polyurethane foam exclusively for these reasons.

Tate Carlson