If you've been researching how to fix sunken concrete, you've probably come across two main options: mudjacking (also called slabjacking) and polyurethane foam leveling (also called foam jacking). Both methods lift settled concrete, but they work very differently. Here's an honest comparison to help you decide which is right for your project.
How Mudjacking Works
Mudjacking is the traditional method, developed in the 1930s. A crew drills 1-2 inch holes through the sunken slab, then pumps a heavy slurry of water, soil, sand, and cement beneath the concrete. The weight and pressure of the slurry pushes the slab back up to grade.
How Foam Leveling Works
Polyurethane foam leveling is the modern approach. Small holes (about the size of a penny, roughly 5/8 inch) are drilled through the slab. A two-part polyurethane resin is injected, which expands to 15-20 times its liquid volume within seconds. The expanding foam fills voids, lifts the concrete, and hardens in about 15 minutes.
Head-to-Head Comparison
Weight
Mudjacking slurry weighs about 100 pounds per cubic foot. That's a lot of additional weight on soil that already failed once. Polyurethane foam weighs about 2-4 pounds per cubic foot — roughly 95% lighter. The foam stabilizes the soil without adding significant load.
Hole Size
Mudjacking requires 1-2 inch holes (about the size of a quarter to half-dollar). Foam leveling uses 5/8 inch holes (smaller than a dime). The smaller holes are less visible after patching and less likely to crack surrounding concrete during drilling.
Cure Time
Mudjacking takes 24-72 hours before you can use the slab normally. Foam leveling cures in about 15 minutes — you can walk on it immediately and drive on it within an hour.
Water Resistance
This is the biggest difference for Texas homeowners. Mudjacking slurry is essentially wet soil and cement — it can erode, wash out, and shrink over time, especially in areas with drainage issues or expansive clay soils. Polyurethane foam is completely waterproof. It won't erode, shrink, or dissolve, making it ideal for Texas's heavy rains and clay soil conditions.
Longevity
Mudjacking typically lasts 3-5 years before the slurry begins to break down or wash away, especially in problematic soils. Foam leveling is a permanent repair — the foam doesn't degrade, compress, or erode. Most reputable companies offer warranties of 5-10 years or more.
Cost
Mudjacking is generally 20-30% cheaper upfront. Foam leveling costs more initially but offers better long-term value since it rarely needs to be redone. When you factor in the likelihood of mudjacking needing repeat treatment, foam leveling is typically cheaper over a 10-year period.
When Mudjacking Makes Sense
- Budget is the primary concern and long-term durability is secondary
- The area has stable, well-draining soil (rare in most of Texas)
- Heavy slabs like thick commercial concrete that benefit from the slurry's weight
When Foam Leveling Is the Better Choice
- You're in Texas or any area with expansive clay soils
- The area has drainage issues or a high water table
- You need fast cure time (driveways, commercial properties, pool decks)
- You want a permanent, warrantied repair
- Minimal disruption matters (smaller holes, faster job, no heavy equipment)
Our Recommendation
For Texas homeowners, polyurethane foam leveling is the clear winner in almost every scenario. The state's expansive clay soils, heavy rains, and dramatic temperature swings all work against mudjacking slurry. Foam's waterproof, lightweight, permanent nature makes it the superior choice for our climate.
Want to see what foam leveling can do for your property? Hill Country Slabs provides free inspections and estimates. Get your free quote or call (737) 287-4308.
