Workings injecting foam to level out a concrete slab

Mudjacking Vs Polyurethane Foam

Polyurethane foam and mudjacking are both methods used for concrete leveling and raising, particularly in the context of repairing sunken or uneven concrete surfaces. While both approaches aim to address similar issues, polyurethane foam offers several advantages over mudjacking:

Smaller Injection Holes

Polyurethane foam requires smaller injection holes (typically about 5/8 inch in diameter), whereas mudjacking holes are larger. Smaller injection holes mean less disruption to the concrete surface and a more discreet repair job.

Quick Cure Time

Polyurethane foam cures and hardens quickly, often within minutes. This allows for faster project completion and minimizes downtime for the repaired area. In contrast, mudjacking requires more time for the slurry mixture to set and cure.

Water Resistance

Polyurethane foam is water-resistant and won’t erode or wash away over time. This can be an important factor in areas with high water tables or frequent precipitation, where erosion could affect the stability of mudjacking repairs.

Lightweight Material

Polyurethane foam is lightweight compared to the heavy mixture of soil, water, and cement used in mudjacking. This can be beneficial in situations where the underlying soil is weak or compressible, as the lightweight foam puts less stress on the substrate.


Polyurethane foam tends to be more durable over the long term. It resists decay, doesn’t break down over time, and is not as susceptible to the settling and erosion that can affect mudjacking repairs.

Consistency of Material

Polyurethane foam provides a consistent material that won’t shrink or lose volume over time. Mudjacking materials can settle and may require additional injections over time to maintain the desired level.

Greater Precision and Control

Contractors have more control over the lifting process with polyurethane foam. The expansion of the foam can be precisely controlled, allowing for accurate and uniform lifting of the concrete slab. Mudjacking, on the other hand, may be less precise due to the nature of the slurry.

Less Disruption

Because of the smaller injection holes and faster curing time, polyurethane foam generally causes less disruption to the surrounding area. This can be particularly advantageous in areas with landscaping, pavement, or other structures where minimizing disturbance is a priority.


It’s essential to note that the choice between polyurethane foam and mudjacking depends on various factors, including the specific requirements of the project, soil conditions, and budget considerations. Consulting with a qualified contractor is crucial to determining the most appropriate solution for a given situation.

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