Both work; the better choice depends on the job. Mudjacking costs about $4–$9 per square foot and fills big voids well. Polyurethane foam costs about $8–$25 per square foot but weighs a few pounds per cubic foot instead of about 100, uses 5/8-inch holes, and cures in minutes — often better on Baton Rouge’s soft, wet clay.
Foundation Repair Baton Rouge offers both, because each wins in different situations.
Side by side
| Mudjacking | Polyurethane foam | |
|---|---|---|
| Material | Cement-based slurry | Expanding two-part polyurethane |
| Cost | $4–$9 / sq ft | $8–$25 / sq ft |
| Weight | ~100 lb per cubic foot | A few lb per cubic foot |
| Hole size | ~1–2 in | ~5/8 in |
| Cure time | ~24 hours | ~15 minutes |
| Water resistance | Can erode over time | Waterproof |
| Best for | Large voids, budget jobs | Soft or wet soil, quick return to use |
Source: HomeGuide 2026 mudjacking and polyjacking data.
Why weight matters in Baton Rouge
A lot of sunken flatwork here sits on soft, wet clay. Pumping 100-pound-per-cubic-foot slurry under a slab adds load to the soil that already failed. Lightweight foam adds almost none. On a driveway that sank next to the garage over poorly compacted backfill, that difference can decide whether the lift holds.
When mudjacking still wins
On a large void under a low-traffic walk or patio where the soil underneath is reasonably firm, mudjacking’s lower material cost makes it good value. It’s also a proven, decades-old method with predictable results.
What matters more than the material
Water. Almost every sunken slab we lift in Baton Rouge had water washing out its base — a downspout, sprinkler or yard runoff. Seal the joints and move the water, or either material will be lifting the same panel again. See concrete leveling and mudjacking cost.
Bottom line
Foam for soft, wet ground and fast turnaround; mudjacking for big voids on a budget. For a recommendation and price, call Foundation Repair Baton Rouge.