Polyurethane Foam Lifting vs. Mudjacking: How Do They Compare?

Polyurethane foam lifting and mudjacking are two similar but different methods. They are both used to raise and level sunken or settled concrete surfaces, such as sidewalks, driveways, and slabs. They are both cost-effective alternatives to complete concrete replacement, offering various advantages over traditional repair methods.

Mudjacking, also known as slab jacking, involves injecting a cement-based slurry beneath the sunken concrete to lift and level it. 

Polyurethane lifting, or polylifting or foam jacking, involves injecting a high-density polyurethane foam beneath the sunken concrete slab. This will raise it back to its original level.

With mudjacking and polyurethane, sunken concrete is first assessed before holes are drilled, and a lifting mixture is injected. In mudjacking, that mixture is a cement-based slurry. With poly lifting, high-density foam is injected to create a strong foundation. A period of curing and hardening follows as the concrete is lifted. When finished, drilled holes are patched.

Comparison and Differences:

• Material: Polyurethane lifting utilizes high-density polyurethane foam, whereas mudjacking employs a cement-based slurry.
• Injection process: Polyurethane lifting involves injecting a foam that expands, while mudjacking uses a slurry that fills voids.
• Weight: Polyurethane foam is lighter than the cement slurry used in mudjacking, resulting in less burden on the underlying soil.
• Hole size: Polyurethane lifting requires smaller injection holes than mudjacking, causing less surface disruption.
• Curing time: Polyurethane foam cures faster than the cement slurry used in mudjacking, allowing the repaired surface to be used more quickly.
• Water resistance: Polyurethane foam is water-resistant, while cement slurry is susceptible to erosion or washout.

Disadvantages of mudjacking

While mudjacking can be an effective method for raising and leveling sunken concrete surfaces, it does have some disadvantages and limitations that should be considered. These disadvantages include:

• Heavy material: The cement slurry used in mudjacking is heavier than polyurethane foam, which can potentially stress weak soil and cause further settlement or damage.
• Larger holes: Mudjacking typically requires larger injection holes compared to polyurethane lifting. These holes can be more noticeable and may require additional patching and finishing after the lifting process is complete.
• Invasive process: Mudjacking, involving drilling multiple holes in the slab, can be invasive and disrupt surfaces, especially in decorative concrete areas.
• Slower curing time: The cement slurry used in mudjacking takes longer to cure and harden compared to polyurethane foam. This means that the repaired concrete may not be ready for full use as quickly as it would be with polyurethane lifting.
• Environmental impact: The cement-based slurry used in mudjacking can have a higher environmental impact than polyurethane foam. Cement production is an energy-intensive process that contributes to greenhouse gas emissions.
• Limited aesthetic options: The patching material used to fill the drilled holes may not perfectly match the existing concrete surface, which can affect the overall appearance of the repaired area.
• Potential for future settling: Mudjacking addresses the immediate issue of sunken concrete by filling voids and raising the slab. However, if the underlying soil conditions are not addressed, there is a risk of future settlement or subsidence.
• Risk of cracking: The pressure exerted during the mudjacking process can increase stress on the concrete slab, potentially causing cracks in the repaired area.
• Limited application in certain situations: Mudjacking may not be suitable for all types of concrete settlement, especially when the concrete is severely damaged or structurally compromised.

Polylifting is now widely used

Mudjacking was widely used before the early 2000s, when the concept of using expanding polyurethane foam to lift and level concrete surfaces emerged as an alternative to traditional mudjacking methods.

Advancements in materials science and construction technology drove the development of polyurethane foam for concrete lifting. 

Polyurethane foam’s unique properties, including its lightweight nature, expansive characteristics, and ability to resist water, make it an attractive option for raising sunken concrete slabs. The ability to control the foam’s expansion rate enabled more precise, controlled lifting than mudjacking.

Over time, the benefits of polyurethane lifting became increasingly apparent. Contractors and engineers’ growing experience with the technique made it a popular and effective method for concrete repair and leveling.

Today, polyurethane lifting is widely used in the construction industry for a range of applications, including sidewalks, driveways, patios, and other concrete surfaces. Its popularity continues to grow due to its efficiency, durability, and environmental friendliness. Contact us for your concrete lifting services.