Mudjacking vs Polyjacking
Which Concrete Lifting Method Is Best in Kansas City?
A side-by-side comparison of mudjacking and polyjacking — cost, cure time, lift precision, and longevity. Why KC MudJack uses polyurethane foam exclusively.
Quick Answer
Polyurethane Foam vs Cement Slurry, Explained
Mudjacking uses a heavy cement-based slurry to lift concrete. Polyjacking uses lightweight expanding polyurethane foam. In most Kansas City applications, polyjacking provides faster cure times, greater lift precision, and longer-lasting stability — especially in expansive clay soils.
Both methods lift concrete. They use very different materials. They perform differently in clay subgrade.
KC MudJack specializes exclusively in polyjacking and polyurethane concrete lifting, the modern alternative to traditional mudjacking.
Mudjacking
Cement-based slurry. Heavy, slow to cure, dated.
Polyjacking
Polyurethane foam. Lightweight, fast cure, modern standard.
KC Soil Reality
Polyurethane outperforms cement slurry in expansive clay.
15–30 Min
Same-hour use after the lift.
1/10th Weight
Far lighter than cement slurry.
5/8" Ports
Small holes, patched flush.
Long-Term
Outlasts cement-based lifting in clay.
Side-by-Side Comparison
How Mudjacking and Polyjacking Compare
Material
Mudjacking uses cement slurry. Polyjacking uses polyurethane foam. The materials behave entirely differently in clay subgrade.
Weight
Mudjacking is heavy and adds load to soil. Polyjacking is lightweight — about 1/10th the density.
Cure Time
Mudjacking cures over hours to days. Polyjacking reaches load-bearing strength in 15–30 minutes.
Long-Term Stability
Mudjacking re-settlement is variable in clay. Polyjacking stability is consistently high.
What Is Mudjacking?
Know when to lift settled concrete and when replacement is the smarter call
Mudjacking (also called slab jacking) pumps a cement-based mixture beneath sunken slabs. The slurry fills voids and raises the concrete back toward its original position. The technique dates to the 1930s and was the dominant slab-lifting method for most of the 20th century.
Limitations: heavy material adds weight to weak soils, longer cure times (hours or days), can break down in wet conditions, less precise lift control, and higher likelihood of future re-settlement in clay soils.
What Is Polyjacking?
The Modern, Polyurethane-Based Method
Polyjacking — also known as polyurethane concrete lifting — uses high-density expanding foam injected beneath concrete slabs. As the foam expands, it fills voids, lifts the slab with precision, and cures into a strong, moisture-resistant support layer.
Polyjacking has largely replaced mudjacking in residential and commercial concrete lifting due to its performance advantages.
Which Method Works Better in Kansas City?
Long-Term Stability for Sunken Concrete
Kansas City is known for expansive clay soils that shift with moisture changes. Adding heavy material beneath a slab can increase stress on already unstable soil.
For this reason, polyjacking is often the preferred method for driveways, sidewalks, patios, garage floors, and pool decks. Mudjacking may still work in limited situations with very stable soils, but most homeowners benefit from the lighter, more precise nature of polyurethane lifting.
Mudjacking vs Polyjacking FAQs
The most common comparison questions, answered straight.
- Lightweight material that will not overload weak soils
- Fast cure times, often usable in 15 to 30 minutes
- High lift precision for cleaner leveling results
- Moisture-resistant support for long-term performance
When to Choose Each Method
Polyjacking Wins When You Want…
Fast Return to Use
Lifted concrete is load-bearing in 15–30 minutes. Compare to 24–72 hours for mudjacking and weeks for replacement.
Precision Lifts
Foam expansion is metered in real time — slabs lift in millimeters, not inches at a guess. ADA-tolerance results without redo work.
Long-Term Stability
Polyurethane doesn’t break down, wash away, or compress. Lifts hold for decades; mudjacking commonly re-settles within years in clay.
Clay Soil Performance
Foam stabilizes clay by displacing moisture and adding compressive strength. Mudjacking adds weight to already-stressed soil.
Free Polyjacking Inspection
If you’re researching mudjacking vs polyjacking for your specific slab, the next step is a professional evaluation. About 20 minutes on-site.
Learn More About
Comparison Resources
Not technically — but it has been largely replaced by polyurethane concrete lifting for most modern residential applications, especially in expansive clay soils.
Sometimes slightly higher upfront. But polyjacking often delivers better long-term value due to reduced re-settlement risk and better performance in clay soils.
No. KC MudJack specializes exclusively in polyurethane concrete lifting because it consistently outperforms cement-based methods in Kansas City soil conditions.
Mudjacking typically runs $600–$2,000 in Kansas City. Polyjacking runs $700–$3,000+. Replacement runs $4,000–$12,000+ for comparison.