Sunken driveways, settled patios, uneven sidewalks — these concrete surfaces don't have to be replaced. Both mudjacking and polyurethane foam injection can lift settled concrete back to its original level at a fraction of replacement cost. But they work differently, have different durability profiles, and suit different situations. Understanding the distinction helps you choose the right solution for your property.
How Mudjacking Works
Mudjacking — also called slabjacking — pumps a slurry of cement, water, and soil through holes drilled in the settled concrete. The slurry fills voids beneath the slab and, as more material is pumped in, lifts the concrete back toward its original grade. The holes are then patched with matching concrete. The material hardens over 24 to 48 hours.
- ✓ Material: Portland cement, water, sand, and soil — essentially liquid concrete
- ✓ Hole size: 1.5 to 2 inches in diameter
- ✓ Cure time: 24 to 48 hours before the surface can bear vehicle weight
- ✓ Typical cost: $500–$2,500 for residential concrete lifting
- ✓ Lifespan: 3 to 7 years in Texas conditions — material can wash out over time
How Polyurethane Foam Lifting Works
Polyurethane foam injection uses a two-component expanding foam injected through smaller holes in the concrete. The foam expands to fill voids and lift the slab, then cures rigid in 15 to 30 minutes. The smaller holes are plugged and nearly invisible after patching.
- ✓ Material: Two-component polyurethane that expands 20 to 25 times its liquid volume
- ✓ Hole size: 5/8 inch — much smaller than mudjacking holes
- ✓ Cure time: 15–30 minutes — surface ready for traffic within the hour
- ✓ Typical cost: $800–$3,500 for residential applications
- ✓ Lifespan: 10 to 15+ years — the foam does not wash out, biodegrade, or compress
Side-by-Side Comparison
| Factor | Mudjacking | Polyurethane Foam |
|---|---|---|
| Material weight | Heavy — adds load to subsoil | Lightweight — minimal added load |
| Cure time | 24–48 hours | 15–30 minutes |
| Hole size | 1.5–2 inches | 5/8 inch |
| Cost | Lower ($500–$2,500) | Higher ($800–$3,500) |
| Longevity | 3–7 years in Texas | 10–15+ years |
| Moisture resistance | Can wash out over time | Waterproof and permanent |
| Precision | Good | Excellent — more controllable lift |
| Best for | Budget-conscious, lower-traffic areas | High-traffic areas, near structures |
When to Choose Mudjacking
- ✓ Budget is the primary concern and the concrete is in good condition
- ✓ The settled area is a sidewalk or patio with light pedestrian traffic
- ✓ The settlement is minor — less than 2 to 3 inches
- ✗ The concrete is a driveway with daily vehicle traffic
- ✗ The area has chronic drainage problems — mudjacking material can wash out
When to Choose Polyurethane Foam
- ✓ The concrete is a driveway, garage slab, or high-traffic commercial surface
- ✓ You need the surface back in use quickly — within hours, not days
- ✓ The area has water drainage issues — foam won't wash out
- ✓ The settled slab is near or adjacent to the home's foundation
- ✗ Budget is very tight and the surface is low-traffic — mudjacking is acceptable