What Is Mudjacking?
Mudjacking — also called slab jacking or stone slurry grout leveling — pumps a mixture of pulverized limestone and cement beneath the slab through 1-2 inch holes. The dense slurry fills voids, compacts the soil, and lifts the concrete back to level.
What Is Polyurethane Foam Injection?
Polyurethane foam injection — also called polyjacking — pumps a two-part expanding foam through 5/8 inch holes. The foam expands to fill voids and lift the slab with precision. The foam is lightweight, hydrophobic, and cures in 15 minutes.
Comparison Table
| Feature | Mudjacking | Polyurethane Foam |
|---|---|---|
| Material | Limestone-cement slurry | Expanding polyurethane foam |
| Drill hole size | 1-2 inches | 5/8 inch |
| Cure time | 24-48 hours | 15 minutes |
| Weight | Heavy (adds soil load) | Lightweight (minimal soil load) |
| Water resistance | Can erode with water flow | Hydrophobic — won't erode |
| Cost per sq ft | Lower | Higher |
| Best for | Large areas, heavy loads | Precision lifts, weak soil, wet areas |
| Lifespan | Long-lasting (if drainage addressed) | Long-lasting (inert, won't degrade) |
When to Choose Mudjacking
- The settled area is large — mudjacking is more cost-effective for bigger slabs
- Budget is the primary concern — mudjacking material costs less
- The slab is thick and can accommodate 1-2 inch holes
- The soil beneath is stable enough to handle the added weight of the slurry
When to Choose Polyurethane Foam
- You need the surface ready the same day — foam cures in 15 minutes
- Smaller, less visible patch holes are a priority
- The soil beneath is weak or compromised — foam is lightweight
- The area has moisture or drainage concerns — foam is hydrophobic
- Precision lifting is needed — foam expands evenly for controlled results
Which Method Is Right for Your Project?
The best method depends on your specific situation — the size of the area, the extent of settlement, soil conditions, your budget, and how quickly you need the surface back in use. A free on-site assessment can determine which method is the best fit.
Learn more about each method: mudjacking | polyurethane foam | concrete leveling overview
Cost Comparison
Mudjacking typically costs less per square foot, making it the more economical choice for large areas. Polyurethane foam costs more per square foot but offers faster cure times, smaller holes, and better performance in challenging soil or moisture conditions. See our concrete leveling cost guide for details.