Mudjacking vs Polyjacking
Mudjacking lifts a sunken concrete slab by pumping a cement based grout under it through holes drilled in the slab. Polyjacking does the same job with expanding polyurethane foam, the method Dalinghaus uses.
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Side by Side
How Do Mudjacking and Polyjacking Compare?
Both methods fill the void under a sunken slab and lift it through holes drilled in the concrete. The difference is the material.
| Mudjacking | Polyjacking | |
|---|---|---|
| What is pumped | A cement based grout, mixed as a thick slurry of cement, soil, and water. | Two liquid components that mix at the nozzle and expand into polyurethane foam. |
| Material weight | Heavy. The cured grout stays under the slab as added weight on the soil. | Light. The foam adds little weight to the soil under the slab. |
| Hole size | Larger holes, sized for the slurry hose. | Small holes. Dalinghaus drills holes about five eighths of an inch across. |
| Cure time | The grout needs time to cure before heavy loads return to the slab. | The foam reaches working strength in minutes. |
| What it needs underneath | A void to fill, and soil firm enough to carry the added weight. Water moving under the slab can wash the grout out over time. | A void to fill. The foam resists water, but the cause of the void still has to be dealt with. Inside a home, a ground penetrating radar scan of the floor comes first. |
Either lift holds only as long as the cause of the void has been dealt with, which is why the free evaluation looks at drainage and soil as well as the slab.
What to know about mudjacking and how the method works.
Mudjacking works on simple hydraulics. A crew drills access holes through the sunken slab, sized for a slurry hose, and pumps a cement based mixture through them under pressure. Because the slurry cannot compress, it spreads under the slab, fills the void first, and then lifts the concrete as pumping continues. When the surface reaches grade, pumping stops, the holes are patched, and the slurry cures into a dense, heavy base. Mudjacking is the older member of the slab jacking family of lifts. The newer member, polyjacking with expanding foam, works on the same idea with a far lighter material: two liquid components mix at the nozzle, expand into the void through holes about the size of a coin, and lift the slab in small, controlled stages. Dalinghaus lifts sunken concrete with injected polyurethane foam. Whichever method a slab is quoted for, the soil comes first: a measured concrete evaluation shows why a driveway dropped before anyone decides how to lift it.
The symptoms that usually lead to mudjacking are on the concrete leveling problem signs page, alongside the other signs that point to the same underlying cause.
Care and expertise from a team that's been doing this since 2011.
Whatever method you are weighing, the crew matters as much as the method. Dalinghaus crews handle foundation, concrete, and crawl space work across California, Arizona, and Nevada, and nothing else.
Foundation repair, concrete leveling, and crawl space repair are our entire focus. Not a sideline.
More than 2,000 projects on the clay and desert soils of California, Arizona, and Nevada since 2011.
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Warranty terms come in writing with every proposal, and the terms that apply to your job are stated in that job's paperwork. Ask your project specialist during the free evaluation.
Answers to common questions about Mudjacking.
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The material. Mudjacking pumps a heavy cement based slurry through larger holes, while polyjacking injects lightweight expanding polyurethane foam through smaller ones. Foam adds almost no weight to the soil, resists water, and cures in minutes. Dalinghaus lifts concrete with polyurethane foam.
Solutions we install for concrete leveling.
Every solution is engineered for a specific soil profile and failure mode. Browse the full toolkit.
Concrete Grinding
Where a slab has stopped moving and one edge stands proud, shaving it flush removes the hazard in a visit. Where the slab is still moving, it only resets the clock.
Learn more
Concrete Void Filling
A void is a gap the concrete is bridging. Concrete void filling, done before the slab finds out, is the cheapest version of this repair anyone will ever offer you.
Learn more
Polyjacking
Polyjacking injects expanding polyurethane under a sunken slab, raising it in minutes through coin sized holes. Light on the soil, hard under the load.
Learn more Polyurethane Foam Injection
Polyurethane foam injection restores the support your concrete lost: it fills the gap, densifies the soil, and lifts the slab back to grade, all through coin sized holes.
Learn more
Slab Jacking
Slab jacking lifts sunken concrete from below, through small holes, back to the level it was poured at. Here is how the method works and how we choose the material.
Learn moreFrom free evaluation to a finished repair.
How a concrete leveling project moves from diagnosis to completed repair.
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