Published 2026-03-11 · Madison Foundation Pros
Mudjacking vs PolyLevel: Which Concrete Lifting Method Wins in Wisconsin?
Quick answer: Polyurethane lifting wins on durability in Wisconsin's freeze-thaw climate, because the foam weighs 2 pounds per cubic foot against mudjacking slurry at 100-plus pounds per cubic foot. The light foam does not re-load the underlying soil. Mudjacking runs $3 to $6 per square foot, polyurethane runs $5 to $8 per square foot. Mudjacking repairs usually need re-injection in 8 to 12 years on Madison-area lots. Polyurethane lifts hold for 20-plus years on the same soils.
What each method actually does
Mudjacking is the older of the two methods, dating to the 1930s. The crew drills 1.5-to-2-inch holes through the sunken concrete slab at a grid spacing of roughly 3 to 4 feet. A slurry of soil, Portland cement, and water gets pumped through the holes under pressure. The slurry fills voids beneath the slab and lifts the concrete as the void volume fills. Once the slab reaches the target elevation, the crew caps the holes with patching concrete. Cure time runs 24 to 48 hours before the slab can carry full load.
Polyurethane lifting (sold under brand names like PolyLevel and Prime Resins, both available in the Madison market) is the newer method. The crew drills smaller 5/8-inch holes at a tighter grid spacing. A two-part polyurethane resin gets injected through the holes. The two parts mix in the void beneath the slab, react chemically, and expand to roughly 20 to 30 times their liquid volume within seconds. The expanded foam lifts the slab and cures in 30 minutes. The crew patches the small drill holes after the lift is verified.
The weight question
This is the single biggest reason the two methods perform differently in Wisconsin. The mudjacking slurry weighs roughly the same as the original soil it replaces (100 to 125 pounds per cubic foot for cement slurry, compared to 110 to 130 pounds per cubic foot for compacted clay till). When the slurry fills a void and lifts the slab, the same weight loading that originally compressed the soil beneath the slab now pushes down on the slurry. Over time, the slurry can re-compress that soil and the slab can sink again.
Polyurethane foam weighs 2 pounds per cubic foot once cured. The foam does not load the underlying soil meaningfully. Whatever pressure the original slab plus its surface loading delivered to the soil before the lift, the post-lift slab delivers the same pressure plus a negligible foam weight. The soil does not re-compress under the slab in any measurable way, and the lift holds.
Head-to-head comparison
| Factor | Mudjacking | Polyurethane (PolyLevel) |
|---|---|---|
| Per square foot cost | $3 to $6 | $5 to $8 |
| Material weight | 100 to 125 lb/cu ft | 2 lb/cu ft |
| Drill hole size | 1.5 to 2 inches | 5/8 inch |
| Cure time before load | 24 to 48 hours | 30 minutes |
| Expected service life | 8 to 12 years | 20-plus years |
| Water resistance | Slurry can wash out under heavy water | Closed-cell foam, hydrophobic |
| Best fit | Budget-priority lifts on stable subgrade | Driveways, garage floors, heavily loaded slabs in freeze-thaw climates |
Where freeze-thaw changes the math
Wisconsin runs 95 to 115 freeze-thaw cycles per year in the Madison area, well above the national average. Each cycle expands water in the soil pores by 9 percent and contracts it back, working at the boundary between the slurry or foam and the surrounding native soil. Mudjacking slurry, being heavier and more porous than polyurethane foam, lets water into its pore structure and ratchets back and forth through each cycle. Over a decade, the slurry slowly migrates, settles, and gives back some of the original lift. Polyurethane foam is closed-cell, hydrophobic, and dimensionally stable through the same cycles. The lift stays where it started.
Wisconsin DOT pavement studies have documented this difference on highway slab repair projects across the state. The state has slowly shifted its concrete-lifting specifications toward polyurethane for the same reason a Madison driveway lift should: the freeze-thaw climate punishes the heavier material faster.
Where each method makes sense in Wisconsin
Four use cases tell most of the story for the Madison-area homeowner.
- Sidewalk and patio slabs, decorative use, low budget. Mudjacking still wins here on price. A short walkway with a 1-inch settlement is a $400 to $700 mudjacking job versus a $700 to $1,000 polyurethane job. If the slab is purely decorative and the homeowner is comfortable with a 10-year re-injection horizon, the math works.
- Driveway slabs and garage floor slabs, regular vehicle loading. Polyurethane every time. The vehicle loading would re-compress mudjacking slurry within 5 to 8 years on a Madison clay soil. The polyurethane lift handles the same loading indefinitely.
- Slabs adjacent to a foundation or attached to a porch. Polyurethane. The reduced material weight on these slabs matters because they connect to the home's structural envelope, and any sinking of the slab against the foundation wall can crack the bond at the joint.
- Pool deck slabs around a residential pool. Polyurethane. The slab is exposed to chlorinated splash water year-round, and the closed-cell foam holds up where the mudjacking slurry can wash out at the pool edge.
Three real Madison-area projects
An Atwood neighborhood driveway slab had settled roughly 1.5 inches at the apron where it met the garage floor. Polyurethane lift, 280 square feet, $1,800 all-in. The crew drilled twelve 5/8-inch holes, injected two-part foam from a Prime Resins kit, lifted the slab back to flush with the garage floor in 25 minutes, patched the holes, and was off the lot before lunch. The homeowner parked on the slab that evening.
A Sun Prairie home in Smith's Crossing had a 60-foot front walkway slab that had settled at the connection to the front stoop, opening a 2-inch gap at the joint and creating a tripping hazard. The owner was budget-conscious and the walkway carries only foot traffic. Mudjacking, 180 square feet, $900. The walkway was off-limits for 48 hours during cure, then reopened. The owner reported the joint stayed flush at the 18-month check-in.
A Verona Hawks Landing home had a sunken garage floor at the rear two parking bays where the original cut-fill construction had compacted under vehicle loading. The slab was 22 feet by 22 feet, and the rear edge had dropped roughly 2.5 inches. Polyurethane lift, 480 square feet, $3,400. The math against replacement (which would have run $9,000 to $12,000 for a slab this size) made polyurethane the clear choice.
What an honest concrete-lifting quote includes
Four line items, each with a number. The slab square footage being lifted. The method (mudjacking or polyurethane), with the material brand named. The expected lift height, in inches. The warranty term and what it covers (a real polyurethane warranty runs 5 to 10 years on the lift staying put; a real mudjacking warranty runs 2 to 5 years). If the quote does not name a number on each of those four items, ask for it before you sign.
When neither method is the answer
Two situations push past concrete lifting and into other repair categories. If your slab has shifted because the foundation it abuts has settled, the right fix is foundation underpinning (helical piers or push piers under the foundation), not lifting the slab. The slab will keep moving until the foundation stops moving. If the slab itself has cracked into multiple pieces or has spalled severely, the right fix is replacement, not lifting. Lifting a fractured slab usually just opens the cracks wider and creates trip hazards in new places.
Frequently asked
What is the price difference between mudjacking and PolyLevel in Madison?
Mudjacking runs $3 to $6 per square foot of slab area in our service area. Polyurethane lifting (PolyLevel is the brand-name version, but several manufacturers sell equivalent material) runs $5 to $8 per square foot. On a 200-square-foot sunken driveway slab, mudjacking lands around $700 to $1,100, while polyurethane lands around $1,000 to $1,500. Per-job pricing depends on the total square footage, the access for the equipment, and how aggressive the lift has to be.
Which method lasts longer in Wisconsin freeze-thaw?
Polyurethane. The mudjacking slurry (a mix of soil, cement, and water) is heavier than the original soil under your slab, so it can re-compress the same soil that caused the original sinking. Polyurethane foam weighs roughly 2 pounds per cubic foot, against mudjacking slurry at 100-plus pounds per cubic foot. The lighter foam does not load the underlying soil, which means the lift stays put for longer in cycle-prone climates. We see mudjacking repairs that need re-injection in 8 to 12 years on Wisconsin soils. We see polyurethane repairs that hold for 20-plus years on the same lots.
Does either method work on a sinking driveway in Madison?
Yes, both can lift a sunken concrete driveway slab, and both are routinely used in our service area for that exact purpose. Polyurethane is the more common choice on driveways because the cure time is faster (30 minutes versus 24 to 48 hours for mudjacking), which means you can park on the slab the same day. Mudjacking still works on a driveway when budget is the deciding factor, but plan for the curing window.
Can concrete lifting fix a sunken garage floor?
Sometimes. A garage floor that has settled because the underlying soil compacted under vehicle loading can be lifted with either method, and we have done both. The catch is the cause: if the floor settled because the soil beneath it was undisturbed when the home was built, the lift will hold. If the floor settled because of a more serious underlying problem (a leaking service line eroding the subgrade, a void from a collapsed sewer trench), lifting the slab does not address the root cause and the slab will settle again. The free inspection includes a probe of the subgrade to confirm which case applies.
Will either method work on a foundation wall?
No. Neither mudjacking nor polyurethane lifting addresses foundation wall settlement, foundation wall bowing, or basement waterproofing. These methods are for slab-on-grade concrete: driveways, sidewalks, patios, garage floors, sometimes pool decks. Settling foundation walls require helical piers or push piers, which is a different engineering category. Anyone selling polyurethane as a foundation-wall fix is selling a tool for a problem it does not solve.
How do I know if my concrete slab is a candidate for lifting or needs replacement?
Two measurements decide. The slab thickness has to be at least 4 inches (most residential driveways and sidewalks meet this). The slab has to be structurally intact, meaning no cracks wider than half an inch and no spalling that has exposed reinforcing wire. A slab with hairline cracks and a 1-to-3-inch settlement can be lifted. A slab that has crumbled or has settlement greater than 4 inches usually needs replacement because the lifting would put unrecoverable stress on the cracked concrete. We confirm during a free measurement visit.
Ready for a free concrete-lifting quote?
Call (608) 407-7510 for a free measurement visit and a written quote within 48 hours. The full Madison foundation cost guide covers pricing across every service we run. See the foundation settlement repair service page if you suspect the slab problem is actually a foundation problem. Our Sun Prairie service area page covers the buildout patterns where slab settlement most often shows up. And our companion article on helical pier costs in Madison covers the structural side if the slab is connected to a settling foundation.
Last updated: 2026-03-11.