Foam lifting and mudjacking · Elgin, IL

Concrete Lifting Near Me: Leveling Sunken Slabs Around Elgin

When a walk, patio, stoop or driveway panel drops but stays in one piece, it can often be raised back into place through holes drilled in it, with no tear-out. When it’s broken, or the ground under it is still moving, lifting is money spent on the wrong fix.

Ask about a sunken slab (847) 713-1544

Lifting raises the slab. It does nothing about the water that dropped it, so this page spends as long on causes as on methods.

Snow shovel clearing a strip across a concrete slab — Stock photo: a snow shovel clearing a strip across a concrete slab. A sunken panel’s raised edge is what the blade catches.

Concrete raising near me: polyurethane foam vs mudjacking

Both methods raise a slab from underneath through holes drilled in it. Foam lifting injects an expanding polyurethane; mudjacking, also called slab jacking, pumps a cement-based grout. The visible difference is the holes, so start there. The drawing is to scale, holes included.

Show holes for:

Hole sizes at 4× life size.

Both methods shown: foam holes are the small dots, mudjacking holes the larger circles.

Polyurethane foam injection

Hole size: ⅝ in. on the residential job Pro Remodeler described. Missouri DOT’s maintenance manual gives 9/16 to 3/4 in. for polyurethane on highway pavement.
Layout on that job: Holes about 3 ft apart and about 18 in. from the slab edge. The contractor kept holes at least 6 in. from any edge: “any closer and the foam tends to ooze out the side.”
What goes in: A two-part polyurethane that expands under the slab, much lighter than a cement grout.
Set time: “The foam begins to stiffen quickly, but it doesn’t fully cure for 15 minutes” (Pro Remodeler).
What’s left: Holes sealed with concrete, which “leaves nickel-sized spots on the slab.”

Mudjacking (slab jacking with grout)

Hole size: “Generally 2 5/8 in. in diameter” in Missouri DOT’s manual. That is highway-pavement practice; residential rigs vary, and we haven’t found a reliable published size for house-scale work.
Layout: Drawn at the foam job’s positions only so the sizes compare. Real hole spacing depends on the slab and where the void is.
What goes in: A pumped cement-based grout that fills the void and pushes the slab up. Heavier than foam, so it adds load to the same soil.
What’s left: MoDOT fills grout holes with mortar of one part cement to three parts concrete sand. Expect round patches that won’t match the old surface exactly.

Plan: a 6 × 12 ft slab drawn to scale with hole positions spaced like the Pro Remodeler job. Sources: Missouri DOT Engineering Policy Guide 570.5; Pro Remodeler, “Repairing a Sinking Slab” (2018). Neither is a quote for your slab.

Where poly foam leveling earns its keep

Small holes and small patches matter on a front walk or a patio people look at. The material is light, so it adds little weight to soft clay, and it sets quickly enough that a walk is back in use the same day.

Where mudjacking still makes sense

Grout is the older method, and highway departments still document it. It fills a large void with mineral material and is a reasonable choice for a big, plain slab where the patches won’t bother anyone. The trade-offs are bigger holes and more weight left sitting on the same soil that settled.

Cement lifting near me for walks, patios, steps and driveway panels

A slab is a lifting candidate when it dropped as one piece, the top is still sound, and whatever undermined it can be fixed. Then lifting beats tearing out and pouring new, on price and on time. Here is how that plays out around a typical house.

Front walks and trip edges

A walk panel that dropped an inch at a joint becomes a trip edge and a snow-shovel catcher. Lifting brings it back flush with its neighbor. A walk that is broken up or badly flaked belongs on the sidewalk and front walk page instead. The public walk is City right-of-way, where Elgin requires engineering permits for sidewalk work; check with the City before anyone drills a public panel.

Patios that tip toward the house

The worst direction a patio can settle is toward the foundation, because then every rain runs at the basement. Lifting resets the pitch away from the wall. If the patio is broken or the base was never there, a new patio slab built to the City’s patio guide is the better money.

Stoops and steps

A step unit that sank in one piece can sometimes be raised. Elgin’s stairs guide expects stairs and landings to sit on 42-inch-deep footings, though, and a stoop that sank usually never had them. Lifting doesn’t add a footing, so if it keeps moving, it’s a stoop rebuild.

Driveway panels and garage aprons

The panel by the garage door and the one at the street end are the usual ones to drop. Both can be lifted if they’re whole. The approach past your property line is City right-of-way with its own engineering permit, so it’s a separate conversation from the rest of the drive.

Slabs we’d tell you not to lift

Broken into pieces. Each piece moves on its own and the cracks open as it rises.
Badly scaled or crumbling on top. Lifted, it is a level slab that still flakes. Replace it, or resurface a sound one.
Heaved up by roots or frost. Lifting only raises. It can’t bring a high slab down.
Sitting on fill that is still settling hard. Wait, or plan on lifting again.

Concrete jacking near me: what happens on lift day

A lift is usually a short visit, and most of the questions come up the same way every time. Open them in order or read the whole thread.

The day before

Elite Concrete Elgin
Move cars, planters and furniture off every slab being lifted, and leave a clear path for the hoses. Point out sprinkler heads and any pipe or wire you know runs under the slab: JULIE’s member utilities only mark their own lines, so private lines are the owner’s to know about.
Drilling

Elite Concrete Elgin
It depends on the slab’s size and where the empty space under it is. On one foam job described in Pro Remodeler, the holes ran about 3 feet apart and about 18 inches in from the edge. Mudjacking holes are larger, so expect fewer, bigger patches rather than a different spacing rule we can promise.
Lifting

Elite Concrete Elgin
The slab comes up a little at a time, moving from hole to hole, while someone watches a straightedge or string line and the joints with the next slab. The target is the pitch it should have had, running water away from the house, not dead level.
Lifting

Elite Concrete Elgin
Yes, and anyone who says otherwise hasn’t lifted many. A crack you can’t see yet can open, and a slab pushed up unevenly can snap. Lifting slowly from several holes lowers the risk; it doesn’t remove it. Point out cracks you know about before we start.
Right after

Elite Concrete Elgin
Foam stiffens fast; Pro Remodeler’s contractor notes it “doesn’t fully cure for 15 minutes.” Grout takes longer and depends on the mix and the weather, so get the time for your job in writing. The hole patches need their own cure either way.
Right after

Elite Concrete Elgin
Foam holes sealed with concrete leave “nickel-sized spots,” in Pro Remodeler’s words. Grout holes are bigger round patches; Missouri DOT fills them with a one-to-three cement and sand mortar. Neither will match weathered concrete exactly at first.
A year later

Elite Concrete Elgin
Only if whatever sank it is still at work. Seal the joints between the lifted slab, the house and the next slab with a flexible sealant so water stays out, and fix the downspout or grade that caused it. Fill beside a newer house can keep settling, and a second lift is sometimes part of the honest answer.

After the lift: seal the joints

A lifted slab is only as good as the joint between it and the house. NRMCA CIP 6 calls for isolation joints separating slabs from garage slabs, stairs and other points of restraint; when those open up after settling, water goes straight down them. Fill them, and any cracks, with a flexible sealant once the lift is done.

Then watch the first heavy rain. Water should run off the slab and away from the house. If it ponds against the wall, the pitch or the downspout still needs work.

Cement leveling near me: why slabs sink on Elgin clay till

Slabs don’t sink on their own; the ground under them gives way. Much of the Elgin area sits on glacial till that the Illinois State Geological Survey describes as silty clay, silty clay loam and clay, soil that holds water. Add a roof’s worth of runoff, loose fill beside a basement and a thin base, and you have most of the sunken slabs in town. Choose a cause to see where it happens.

Downspout dumping beside the slab: deal with it before lifting. Extend or reroute the downspout so it lets go well away from the slab, onto ground that slopes away. Elgin’s Private Property Drainage Assistance program lists re-grading, drain tile and dry wells as eligible projects (downspouts tied into City sewers are not); check the current terms with the City.
Soft backfill against the foundation: deal with it before lifting. Lift once the fill has mostly settled and set the pitch back away from the house. On a newer house, ask whether a second lift may be needed later.
Thin or loose base under the slab: deal with it before lifting. Foam or grout fills the gaps under a slab; it can’t compact the ground beneath. Where there was never a real base, a lift may hold for a while, and replacement on a proper base is the lasting fix.
An empty pocket (void) under the slab: deal with it before lifting. This is what lifting fills. But a void always has a cause, usually one of the others on this list, so find it first.
Wet clay till underneath: deal with it before lifting. Keep water off it: slabs pitched away from the house, joints sealed, downspouts carried away. Foam’s light weight adds little load to soft ground; a heavy grout adds more.

A roof gathers rain into one outlet, and Elgin averages 39.85 in. of precipitation a year, with May the wettest month (NOAA normals). Dumped at a slab’s edge, that water carries fine soil out from under it a little with every storm, until the edge has nothing to sit on.
A basement hole is dug wider than the walls and refilled after they go up. That fill rarely gets compacted like the undisturbed ground around it, so it keeps settling for years, and a stoop, walk or patio poured over it tips toward the house: backward for drainage.
Elgin’s patio guide recommends a 4 in. gravel base to help “control cracking and freezing upheaval or settlement,” its driveway guide requires 4 in. of compacted gravel, and its sidewalk guide limits earth fill under the base to 8 in. A slab poured on dirt or loose fill settles unevenly.
Washouts, settling fill and burrowing animals leave an empty space. The slab bridges it until a load cracks it or it drops. Tapping often finds it: a hollow sound where the slab should sound solid.
The Illinois State Geological Survey maps much of the Elgin area as glacial till described as silty clay, silty clay loam and clay. That soil holds water. Wet, it is softer under a slab; frozen, it heaves. NOAA’s Elgin station averages 139 days a year with a low at or below 32°F.

Lifting fills the void. It doesn’t change the soil, the fill or the water. Fix the cause first, or plan on seeing the same slab again.

Concrete leveling cost vs replacement

No reliable Elgin price for slab lifting is published. The lead-service page for injection leveling in Elgin shows no figures at all, and we won’t make one up. What we can tell you is what moves a lifting price, and how to compare it with replacing the slab.

What moves a leveling price

How many slabs and how far they dropped: more panels and deeper drops take more holes and more material.
The size of the void: filling a washed-out pocket takes far more foam or grout than lifting a slab that settled evenly.
Foam or grout: different materials, equipment and patching.
Access: how far the hoses have to reach, and what has to be moved.
Sealing joints and cracks afterward, which belongs in the quote.
A trip minimum: the rig comes out whether it lifts one slab or six.

Lifting against tearing out

Replacement adds breaking out and hauling away the old slab, building a base, forms, new concrete, curing time, and for driveways and patios a City permit with a plat of survey and a final inspection. Lifting skips all of that, which is why it usually wins when the slab is sound.

Compare like with like: a lifting quote against replacing only the sunken panels, not the whole walk or drive.

Mudjacking or foam: comparing leveling quotes

Ask each quote for the method, the number of holes, how they will be patched, and whether joints get sealed. A lower number that leaves out the sealing isn’t lower.

Send photos of the sunken slab for a leveling estimate

A photo along the slab at ground level shows the drop better than one from above. Add one of the nearest downspout and one of where the slab meets the house or the next slab.

We pour new concrete too, so if lifting is the wrong answer you’ll hear it from the same local concrete contractor, with the reason.

(847) 713-1544

Slab lifting questions from Elgin homeowners

How long does a lifted slab stay up?

As long as the ground under it stays put. If the cause was a downspout or settling fill and that has been dealt with, a lift can last as long as the slab. If water keeps washing under it, it will sink again. We won’t quote a number of years, because nobody can for your yard.

Can a sunken driveway panel be raised with foam?

Often, if it’s in one piece. Panels by the garage and at the street end are common candidates. The approach between your property line and the street is City right-of-way, where Elgin requires an engineering permit for approach work, so ask the City before anyone drills it. A broken panel is better replaced; see driveway replacement.

Is mudjacking cheaper than foam?

We haven’t found a reliable published comparison, and prices vary by contractor and job. The fair test is to have both methods priced on the same panels and compare what each includes: number of holes, patching, and sealing the joints afterward.

Will lifting fix the cracks in my slab?

No. Lifting raises the slab; cracks stay where they are, and they should be sealed afterward so water stays out. A slab in several loose pieces isn’t a lifting job. It’s a repair or a replacement.

Can a slab be lifted in winter?

It can be done, but a slab frozen to the ground doesn’t sit the way it will after the thaw. Unless it’s a trip hazard that can’t wait, spring is the better time to judge how far it really sank.

My front stoop sank. Can it be lifted?

Sometimes, if it moved in one piece. But Elgin’s stairs guide expects stairs and landings to sit on 42-inch-deep footings, and a stoop that sank usually never had them. Lifting won’t add a footing, so a stoop that keeps dropping is a stoop rebuild.

Terms used on this page (5)

Polyurethane foam lifting: Lifting a sunken slab with expanding two-part polyurethane injected through small drilled holes. Lighter than mudjacking grout.
Mudjacking: Lifting a sunken slab by pumping a cement-and-soil grout under it through drilled holes.
Glacial till: An unsorted mix of clay, silt, sand and stones left by glaciers. The Illinois State Geological Survey maps much of the Elgin area as till described as silty clay, silty clay loam and clay.
Void: An empty pocket under a slab where soil has washed out, settled or shrunk away. A slab bridging a void is unsupported and will crack or drop under load.
Plat of survey: The surveyed drawing of your lot showing its lines and what’s built on it. Elgin’s driveway, patio and sidewalk quick guides ask for one, marked up with the new work.