Mudjacking Educational Page
Mudjacking in Kansas City: Why Polyjacking Replaced It
Mudjacking is a real concrete lifting method with decades of history. In Kansas City clay, it's been largely replaced by polyurethane concrete lifting. Here's why.
What Is Mudjacking?
A Plain-English Look at the Older Method
Mudjacking (also called slab jacking) is a traditional concrete lifting method that pumps a cement-based slurry beneath sunken slabs through drilled ports. The slurry fills voids and forces the slab back to grade.
The technique dates to the 1930s and was the dominant slab-lifting approach for most of the 20th century. KC MudJack — despite the name — does not install mudjacking. We specialize exclusively in polyurethane concrete lifting because it consistently outperforms cement-based methods in Kansas City conditions.
Cement-Based
Slurry of cement, sand, water, sometimes lime or fly ash.
Heavy & Slow
Adds weight to soil. Cures in hours or days.
Largely Replaced
By polyurethane concrete lifting in modern residential applications.
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.
Limitations of Mudjacking
Why Most KC Contractors Moved Away
Heavy Material
Cement slurry adds weight to soil that's often already shifting. In clay subgrade, this can accelerate the next round of settlement.
Slow Cure
Hours to days before the slab is back in service. More downtime than modern alternatives.
Less Precise
Lift control is approximate, not exact. Hard to fine-tune for finish or drainage.
Re-Settles in Clay
Higher likelihood of future settlement in expansive clay soils — common across the entire Kansas City metro.
What Replaced Mudjacking
Why Homeowners Usually Prefer Polyurethane Instead
Polyjacking uses two-part expanding polyurethane foam injected through smaller ports. The foam cures in 15–30 minutes (versus hours or days), weighs roughly a tenth of cement slurry, displaces moisture instead of absorbing it, and allows precise real-time lift control.
In Kansas City clay specifically, the lighter material and faster cure make a significant long-term difference. Most reputable contractors here moved to polyurethane a decade or more ago.
Where Mudjacking Still Has a Role
Honest Take — Some Cases Work
Large stable industrial slabs in non-clay regions. Some commercial settings. Lower-budget projects where long-term re-settlement isn’t a priority. There are crews who do mudjacking well and projects where it makes sense.
For a residential driveway, sidewalk, or garage floor in the Kansas City metro? Polyurethane is almost always the better call.
Does KC MudJack Offer Mudjacking?
Long-Term Stability for Sunken Concrete
No. Despite the name, we don’t install traditional mudjacking. Our equipment, materials, and crew are configured for polyurethane work exclusively.
The “MudJack” name comes from local search familiarity — homeowners type “mudjacking” because that’s the term they’ve heard. Our job is to educate, then deliver the better solution.
Mudjacking FAQs
The most common questions about mudjacking and why it’s been largely replaced.
- 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
How to Decide
Questions Worth Asking
Soil Type
Kansas City sits on expansive clay — the soil shrinks and swells with moisture. Heavier slurry mudjacking accelerates that cycle; lightweight foam doesn’t.
Speed
Polyjacking finishes in 1–3 hours. Mudjacking ties up the slab for 24–72 hours of cure time and may need follow-up adjustments.
Long-Term Value
Polyurethane lasts decades without re-settlement. Mudjacking often re-cracks within a few years in expansive clay.
Replacement Risk
If a slab is mudjacked and drops again, replacement may be the only option. Polyjacking gives you a second shot — and usually doesn’t need one.
Free Polyjacking Inspection
Whether you’ve been researching mudjacking, polyjacking, or just trying to figure out why your driveway is sinking, an inspection takes about 20 minutes and gives you a real answer.
Learn More About
Related Resources
Not technically — it still works in some applications. But it’s been largely replaced by polyurethane concrete lifting for most modern residential work, especially in clay soils.
A few contractors still offer it. We don’t, because polyurethane consistently performs better here.
Sometimes upfront. But mudjacking re-settles more often in clay subgrade, which can mean paying for two lifts instead of one over time.
Mudjacking typically runs $600–$2,000 in Kansas City. Polyjacking runs $700–$3,000+. Replacement runs $4,000–$12,000+ for comparison.
Mudjacking alternative quick answer
KC MudJack is a mudjacking alternative, not a cement mudjacking installer
Many Kansas City homeowners search for mudjacking when they need settled concrete repaired. KC MudJack does not install traditional cement slurry mudjacking; it specializes in polyurethane foam lifting, often called polyjacking, for driveways, sidewalks, patios, garage floors, and void filling.
Key facts
- Traditional mudjacking uses a heavier cement-based slurry.
- KC MudJack uses polyurethane foam instead.
- The page is intended to help homeowners compare methods clearly.
When it works
- Homeowners comparing foam lifting to cement slurry.
- Slabs that are candidates for lighter-weight foam lifting.
- Searches for mudjacking alternatives in Kansas City.
When it may not fit
- Visitors specifically wanting cement slurry installed.
- New concrete pouring or replacement-only projects.
- Concrete too damaged to lift.