Concrete Raising Explained: Comparing Polyjacking, Mudjacking, and Replacement
If your driveway, sidewalk, or patio has started to sink or slope, you’re not alone. Minnesota’s freeze-thaw cycles and shifting soils cause concrete to settle over time. The good news? You don’t always have to replace it. Today’s homeowners have several options for lifting and leveling concrete — and knowing the difference can save you thousands.
Why Does Concrete Settle in the First Place?
Before you fix it, it helps to understand why it happens.
Common causes of uneven concrete include:
Soil Erosion: Water washing out the soil beneath slabs.
Freeze-Thaw Cycles: Moisture expands when frozen, then contracts, leaving voids.
Poor Compaction: Soil not packed tightly enough during original construction.
Heavy Loads: Driveways and garage aprons take repeated vehicle weight over time.
When the soil shifts, concrete follows — creating uneven surfaces, trip hazards, and drainage issues.
3 Main Ways to Raise Sunken Concrete
Not all concrete repair methods are equal. Here’s how the three main options work, and how to choose the right one.
1. Polyurethane Concrete Raising (a.k.a. Polyjacking)
How it works:
Small holes (about the size of a dime) are drilled into the concrete. A two-part polyurethane foam is injected beneath the slab, expanding to fill voids and gently lift the concrete back into place. Once leveled, the holes are patched and the surface is ready for use—usually within minutes.
Why homeowners choose it:
Fast, clean, and minimally invasive
Lightweight material prevents future settling
Closed-cell foam resists water and freeze-thaw damage
Environmentally safe and long-lasting
Best for: Driveways, garage aprons, patios, steps, and sidewalks
This is the method Benchmark Concrete Raising specializes in. We use high-quality, hydro-insensitive polyurethane foam that won’t break down in Minnesota weather.
2. Mudjacking (Slabjacking)
How it works:
A mixture of water, soil, and cement (called “slurry”) is pumped under the slab to lift it. The holes drilled are larger (about the size of a quarter), and the material is heavier than polyurethane foam.
Why homeowners consider it:
Usually cheaper upfront
Works well for larger, thicker slabs like warehouse floors
Downsides:
The material is heavy and can cause future settling
Longer curing time before use
Larger patch marks left behind
Not water-resistant
Best for: Large commercial applications where weight isn’t a concern
3. Full Concrete Replacement
How it works:
The old concrete is demolished, removed, and a new slab is poured in its place. While this provides a completely new surface, it comes with a higher price tag and longer downtime.
Why homeowners choose it:
Concrete is severely cracked, crumbling, or structurally damaged
Drainage or design needs have changed
Downsides:
Typically 50–70% more expensive than leveling
Longer project time (days instead of hours)
Creates waste and environmental impact
Best for: Surfaces that are too damaged to lift or where aesthetics demand a fresh pour
Polyjacking vs. Mudjacking: Quick Comparison
FeaturePolyjackingMudjackingDrill Hole SizeSmall (⅝")Larger (1½"–2")Material WeightLightHeavyCure Time15–30 minutes24+ hoursWater ResistanceExcellentPoorDurability10–20 years5–10 yearsEnvironmental ImpactLowModerateCostSlightly higher upfront, lower long-termLower upfront, higher long-term risk
When to Raise vs. Replace
Raise your concrete if:
The slabs are intact but uneven
You see trip hazards or pooling water
You want a fast, affordable, and clean fix
Replace your concrete if:
It’s severely cracked or deteriorated
The base is unstable or eroded beyond repair
You’re regrading or redesigning the surface
The Takeaway
Concrete raising is one of the most cost-effective ways to restore your property’s safety and appearance — especially with modern polyurethane foam. It’s fast, durable, and designed for Minnesota’s toughest weather.
Benchmark Concrete Raising, specializes exclusively in polyurethane concrete leveling — not mudjacking — because it gives homeowners the cleanest, longest-lasting results. Whether it’s your driveway, sidewalk, steps, or patio, we’ll lift it right the first time.
