Foam Polyurethane vs Mud-Jacking: Which One is Right for Your Project?

Over time, concrete slabs can settle and crack. This is often due to poorly compacted fill under the slab or natural soil erosion. Whatever the reason for the settling, it can create an unsightly problem that also poses a trip hazard. There are two main ways to lift concrete slabs: foam polyurethane injection and mud-jacking. But which is the better option?

Mud-jacking, also known as slab-jacking or pressure grouting, is a process where a slurry is injected under the settled slab to lift it back into place. The slurry is a mixture of water, cement, sand, and clay. It is pumped under the slab through small holes drilled into the concrete.

Foam polyurethane injection is a newer method of lifting concrete slabs. A two-part polyurethane spray foam is injected under the slab through small holes. The foam expands and lifts the slab back into place. The deep foamjection process fills the void under the slab with polyurethane foam. This creates a “buffer” between the ground and the bottom of the slab, preventing further settlement. This method is less invasive than other concrete leveling methods, and you can complete it in a shorter time frame. Additionally, it doesn’t require any digging or other major disruptions to your property. Foam polyurethane injection is an ideal solution for lifting concrete slabs in residential and commercial applications.

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mud vs foam jacking

Foam vs Mudjacking: The Choice for Long-Lasting Concrete Slab Lifting and Leveling Solutions

Mud-jacking is a traditional method with lower strength and support capabilities. The mud-jacking process often fails within the first few years due to the expansive nature of the clay used in the slurry. If you’re looking for a quick, efficient, and less disruptive way to lift your concrete slabs, you should consider foam polyurethane injection.

Reasons to go with Foam

  1. Foam Polyurethane spreads evenly throughout the void filling every nook and cranny, while mud only flows to low points.
  2. It helps prevent wicking, where water flows through pores in the concrete and can cause the mud-jacking material to wash away. It is weather-resistant and can withstand extreme temperatures.
  3. It has high compressive strength. The foam polyurethane used in the injection process has a compressive strength greater than concrete, thus supporting heavier loads without settling.
  4. Polyurethane is a waterproof material and prevents moisture from seeping into the void and causing further settling.
  5. Polyurethane is an inert material. It will not break down over time like the clay in mud-jacking slurry. The foam will maintain its lifting power for many years.
  6. It compresses at a consistent PSI rate, preventing over-compressing the soil and damaging the concrete.
  7. The injection process is less disruptive and can be completed in a shorter time frame.
  8. Polyurethane is flexible. This allows it to move with the ground and prevents it from cracking under stress.
  9. On most applications, you can resume traffic within 4 hours or less. With mud-jacking, you must wait at least 24 hours before walking or driving over the lifted slab.
Foam vs Mudjacking


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Choice is Clear with Foam

Mud-jacking is an outdated method of concrete leveling that has many disadvantages. Foam polyurethane injection is a newer, more effective method with many benefits. It is less disruptive, can be completed in a shorter time frame, and is more durable. If you’re looking for a quick and efficient way to lift your concrete slabs, then you should consider foam polyurethane injection.