What Are the Benefits of Polyurethane Concrete Leveling Over Traditional Mudjacking?
If you're dealing with sunken or uneven concrete, you've likely come across two repair methods: polyurethane foam injection (polyjacking) and mudjacking. Here's what sets them apart — and why more homeowners and contractors are choosing polyurethane.
The short answer: Polyurethane concrete leveling is faster, lighter, longer-lasting, and less invasive than mudjacking. Foam cures in as little as 15 minutes, requires smaller injection holes, and won't wash away or compress over time the way a soil-based slurry can. For most residential and commercial applications, polyurethane foam delivers a more precise and durable result.
What Is Mudjacking?
Mudjacking — sometimes called slabjacking — is a concrete leveling method that has been used since the 1930s. It works by pumping a slurry mixture of soil, water, and cement beneath a sunken slab through drilled holes typically 1.5 to 2 inches in diameter. The pressure from the slurry lifts the slab back toward its original position.
Mudjacking is a proven technique and is still used today, particularly for large projects where upfront cost is the primary concern.
What Is Polyurethane Concrete Leveling (Polyjacking)?
Polyurethane concrete leveling — also called polyjacking or foam lifting — uses a two-part expanding polyurethane foam injected beneath the slab through much smaller holes, typically 5/8 of an inch in diameter. When the two components combine underground, they react and expand, filling voids and lifting the slab with precision.
Benchmark Concrete Raising uses polyjacking exclusively. Here's why.
6 Key Benefits of Polyurethane Over Mudjacking
1. Faster Cure Time
This is one of the biggest practical advantages of polyjacking. Polyurethane foam reaches functional cure in as little as 15 minutes. That means driveways, sidewalks, and pool decks can be returned to use the same day — often within the hour.
Mudjacking slurry typically requires 24 to 72 hours of curing time before the repaired surface can bear normal traffic. For homeowners or businesses that can't afford downtime, that difference matters.
2. Smaller, Less Visible Repair Holes
Mudjacking requires drilling holes 1.5 to 2 inches in diameter to accommodate the slurry mixture. These holes are patched after the repair, but the patches are often visible — especially on decorative concrete or high-visibility areas.
Polyurethane foam injection uses holes approximately 5/8 of an inch in diameter — roughly the size of a dime. The smaller footprint means patches blend in much better, with significantly less surface disruption to the existing slab.
3. Lightweight Material That Won't Stress the Subsoil
One often-overlooked risk with mudjacking is that the slurry adds considerable weight beneath the slab. A cubic foot of mudjacking slurry weighs approximately 100 pounds. If the underlying soil was already compromised — the reason the slab sank in the first place — adding more weight can accelerate future settling.
Polyurethane foam weighs approximately 2 to 4 pounds per cubic foot. That's up to 50 times lighter than mudjacking slurry. Because it adds almost no load to the subsoil, it's especially well-suited for areas with soft, sandy, or previously eroded soil.
4. More Precise and Controlled Lift
Foam injection allows for highly controlled, incremental lifting. Technicians can monitor the lift in real time and stop at exactly the right elevation, reducing the risk of overcorrecting.
Mudjacking provides less precision — slurry spreads out once it's under the slab, making it harder to target specific areas or achieve exact grades. For projects that require precise leveling, such as garage floors, interior slabs, or pool decks, polyjacking offers a clear advantage.
5. Long-Term Durability — Foam Won't Wash Away
Mudjacking slurry is a soil-based material. Over time, water infiltration can erode or wash out the fill beneath the slab, causing it to settle again. In areas with significant rain, snowmelt, or drainage issues, this is a real concern.
Polyurethane foam is waterproof and inert. It won't erode, compress, or break down in soil conditions. Once cured, foam maintains its structure indefinitely — making it a more permanent solution for long-term stability.
6. Less Disruption to the Surrounding Area
Because polyjacking uses smaller equipment and smaller holes, it causes less disruption to landscaping, adjacent structures, and the surrounding surface. Most polyjacking jobs are completed in two to four hours with minimal mess and no large equipment parked on the lawn.
Mudjacking typically requires a larger pump truck and mixing equipment, and the longer cure time can mean more visible disruption during and after the job.
Is Polyurethane Concrete Leveling Right for Your Project?
Polyjacking is an excellent solution for the vast majority of residential and commercial concrete leveling projects, including sunken driveways and aprons, uneven sidewalks and walkways, settled garage floors and interior slabs, pool decks and patio surfaces, steps and stoops, and commercial entrances and loading areas.
There are situations where slab replacement is the better option — if the concrete itself is too deteriorated or structurally compromised, lifting it won't solve the underlying problem. At Benchmark Concrete Raising, every job begins with an honest assessment of whether lifting is the right call.
Frequently Asked Questions
How long does polyurethane foam last under concrete?
Polyurethane foam is highly durable and does not break down in soil over time. Unlike mudjacking slurry — which can erode or compress — cured foam maintains its structure and density. Most industry estimates put polyurethane foam lifespan at 10 years or more, though many installations last significantly longer when underlying drainage issues are also addressed.
Is polyjacking more expensive than mudjacking?
Polyurethane foam injection typically costs more per square foot than mudjacking due to the higher material cost. However, when you factor in the faster cure time, longer lifespan, and reduced likelihood of needing repeat repairs, polyjacking often delivers better long-term value. Benchmark Concrete Raising provides free estimates so you can make an informed comparison.
Can polyurethane foam be used on all types of concrete?
Polyjacking works on most standard concrete slabs, including driveways, sidewalks, patios, garage floors, pool decks, and interior slabs. It is not appropriate for severely cracked or structurally failed concrete, or when the slab has broken into many small pieces. A pre-job inspection will confirm whether your slab is a good candidate.
Will the foam holes be noticeable after the repair?
The injection holes used for polyjacking are approximately 5/8 of an inch in diameter — much smaller than the holes required for mudjacking. After injection, the holes are filled and patched. While some patch marks may be visible up close, they are significantly less noticeable than patched mudjacking holes and typically blend in well over time.
How quickly can I use my driveway or sidewalk after polyjacking?
In most cases, you can return to normal use within 15 to 30 minutes of completing the repair. Polyurethane foam reaches functional cure very quickly — one of its primary advantages over mudjacking, which requires 24 to 72 hours of curing time.
Does polyjacking fix the cause of concrete settling?
Polyjacking lifts and stabilizes settled concrete by filling the voids that caused the slab to sink. However, if the underlying cause — such as poor drainage, erosion, or soil instability — is not addressed, future settling is possible. Benchmark Concrete Raising will identify any contributing factors and recommend corrective action alongside the repair.
Ready to Fix Your Sunken Concrete?
Benchmark Concrete Raising specializes in polyurethane foam injection for homeowners and property managers across [YOUR SERVICE AREA]. We offer free on-site estimates and can typically schedule repairs within the week.
