April 20, 2026
If you’ve got a sinking driveway, uneven sidewalk, dropping porch, or garage floor that feels like it’s slowly giving up, you’re probably hearing two terms over and over again: polyjacking and mudjacking. At a glance, they sound like two versions of the same repair. In a broad sense, they are. Both methods are used to lift settled concrete. But in the real world, they behave very differently once they’re under your slab.
For homeowners around Marietta, Powder Springs, and the greater Metro Atlanta area, that difference matters. Georgia soil can be unpredictable. Heavy rain, poor drainage, erosion, deep fill zones, and years of settlement can leave concrete unsupported from below. When that happens, the question is not just “How do I lift it?” It’s also “What’s causing the problem underneath, and which repair method gives me the best long-term result?”
Concrete lifting is the process of raising sunken or uneven concrete back toward its original position without tearing it out and replacing it. Instead of demolishing a driveway, patio, walkway, garage slab, or stoop, a contractor drills small access holes and injects material beneath the slab. That material fills voids, adds support, and creates enough upward pressure to lift the concrete.
That sounds simple, but the slab itself is only half the story. The real issue is usually below the surface. Water may have washed soil away. Poor compaction during construction may have left weak zones under the slab. Tree roots, leaking downspouts, or years of consolidation may have created voids and unsupported spans. Concrete lifting works best when the repair addresses both the visible settlement and the hidden instability underneath.
Mudjacking is the older, more traditional concrete lifting method. It uses a slurry mixture, typically made from water, soil, sand, and cement or other dense materials, that gets pumped beneath the concrete through drilled holes. As the slurry fills empty space, it pushes the slab upward.
For decades, mudjacking was the go-to option for lifting concrete. It can still work in certain situations, especially where a heavier fill material is acceptable and precision is less critical. Some contractors and property owners are familiar with it because it has been around a long time. It’s the repair equivalent of an old farm truck: not elegant, not subtle, but it has gotten a lot of jobs done.
Polyjacking, also called polyurethane foam concrete lifting, uses a two-part expanding structural foam instead of a heavy slurry. The foam is injected under the slab through much smaller holes. Once injected, it expands, fills voids, and can lift the concrete with a high degree of control.
This is the modern alternative to mudjacking, and for many residential and commercial applications, it offers clear advantages. The material is lightweight, strong, fast-curing, and well-suited for projects where precision matters. If mudjacking is the old farm truck, polyjacking is more like a modern hydraulic system, cleaner, lighter, more responsive, and better at fine adjustments.
The biggest difference between polyjacking vs mudjacking comes down to the material being injected and how that material behaves under and around the slab. Mudjacking uses a heavy cement-based slurry. Polyjacking uses lightweight expanding polyurethane foam. That one difference affects almost everything else: hole size, cure time, weight on the soil, moisture resistance, precision, and long-term performance.
Think about it this way: if the soil under your concrete is already struggling, adding a heavier material may not always be the smartest move. In some cases, it works. In others, it’s like putting a loaded toolbox on a shelf that’s already sagging. Polyurethane foam, by contrast, adds support and lift without significantly increasing the load on the underlying soils.
One of the first practical differences homeowners notice is the size of the drill holes. Mudjacking typically requires larger holes, often around 1 to 2 inches in diameter. Polyjacking usually uses much smaller holes, often around 3/8 inch to 5/8 inch depending on the application.
That matters for appearance. Smaller holes are less noticeable after patching, especially on visible surfaces like front walkways, patios, stoops, and decorative concrete. If you’re repairing a slab right in front of your home where curb appeal counts, the cleaner footprint of polyjacking can be a major advantage. Nobody wants to fix a trip hazard only to trade it for a row of obvious patch circles staring back at them every time they pull into the driveway.
This is where the conversation gets more serious. Mudjacking material is heavy. It’s a dense slurry, and once it’s pumped beneath the concrete, it adds substantial weight to the already compromised subgrade.
Polyurethane foam is dramatically lighter. That makes polyjacking especially attractive in areas where poor compaction, erosion, or deep fill conditions may have contributed to the settlement in the first place. Around Metro Atlanta, where some homes and slabs are built over fill soils or areas prone to washout, reducing additional load can be a real benefit. A lighter repair material doesn’t guarantee success on its own, but it often makes more sense when the problem started because the underlying soils were weak or unstable.
Another major difference in polyjacking vs mudjacking is how quickly the repaired surface can be used again. Mudjacking usually takes longer to cure because of the water-heavy slurry mix. Depending on conditions, the slab may need more downtime before it’s ready for foot traffic or vehicle traffic.
Polyjacking foam cures quickly, often within minutes. In many cases, concrete can be walked on or driven on the same day. For a busy homeowner, that’s convenient. For a commercial property, it can be the difference between a manageable repair and a disruption that drags on longer than anyone wants. If you’re dealing with a garage entrance, retail walkway, warehouse floor, or loading area, fast turnaround is not just a luxury. It’s part of the value.
Not every slab needs a dramatic lift. Sometimes the job is about carefully recovering an inch, correcting a dangerous lip, or stabilizing a slab without over-lifting and causing damage. Polyurethane foam gives contractors a high level of control during injection, which can make it easier to perform more precise lifts.
Mudjacking can still raise concrete effectively, but it’s generally less refined. The heavier slurry and larger-volume pumping process can make delicate adjustments more difficult in certain applications. On a basic sidewalk panel, that may not matter much. On a settled porch, interior floor, pool deck, AC pad, or section of driveway near a structure, precision becomes a lot more important. You don’t want the repair process to feel like trying to tune a violin with a pipe wrench.
Water is often part of the original problem. Downspouts dumping near the home, poor drainage, erosion, plumbing leaks, or runoff moving under slabs can create voids and settlement over time. So when comparing lifting methods, it’s fair to ask how the injected material responds to moisture.
Polyurethane foam is generally water-resistant and does not wash out the way some traditional fill materials can in wet conditions. Mudjacking slurry, while solid once cured, is still a cementitious material and may be more vulnerable in chronically wet environments depending on site conditions. Neither method should be treated as a substitute for proper drainage correction, but polyurethane often performs well where moisture has been part of the failure pattern.
A lot of homeowners ask the right blunt question: “Okay, but which one lasts?” The honest answer is that long-term performance depends on the condition of the slab, the soil below it, drainage around it, and whether the repair method matches the actual cause of settlement.
That said, polyjacking often has the edge because of its combination of low weight, strong compressive support, fast cure, and ability to fill voids effectively. Mudjacking can last too, but if the soil is weak and the injected material adds more load, that can work against the repair over time. The best contractors don’t just sell a lifting method. They inspect the site thoroughly and explain whether the issue is simple slab settlement, active erosion, poor compaction, or a deeper soil stabilization problem.
In many cases, polyjacking costs more upfront than mudjacking. The material itself is more advanced, and the equipment and application process are different. So if you’re only comparing a line-item price on paper, mudjacking may look like the cheaper option.
But upfront cost is not the same thing as value. If polyjacking gives you a faster repair, smaller drill holes, less added weight, better precision, and a more appropriate solution for unstable soils, it may save money in the long run. A low bid is not a bargain if the slab settles again because the underlying issue was never properly addressed. This is one of those home repair categories where the cheapest number can become the most expensive lesson.
Mudjacking is not obsolete just because polyurethane foam has become more popular. There are situations where mudjacking may still be considered, especially on straightforward exterior slabs where appearance, cure time, and precision are less critical.
It may also appeal to property owners who are focused mainly on initial cost and have conditions that are suitable for a heavier slurry-based lift. The key is not to assume that old automatically means bad or new automatically means best. The right method depends on the slab, the subgrade, the amount of settlement, and the environment around the repair.
Polyjacking is often the preferred method for driveway leveling, sidewalk leveling, porch lifting, garage floor leveling, pool deck repair, patio lifting, stoop stabilization, and commercial slab lifting where speed and precision matter. It is also commonly favored where weak soils, voids, erosion, or moisture-related settlement are part of the problem.
In the Metro Atlanta area, many concrete issues are tied to drainage patterns, soft soils, or fill conditions that are not obvious from the surface. That’s why polyurethane foam lifting is such a strong fit for many local projects. It can lift, stabilize, and fill voids without placing significant extra stress on already compromised soils. For many homeowners, that combination makes polyjacking the more practical long-term repair.
This is the part too many articles skip. Comparing polyjacking vs mudjacking is helpful, but the bigger question is why the concrete moved in the first place. If the slab dropped because of voids under the concrete, lifting may solve the issue cleanly. If the area has active erosion, poor drainage, or deep unstable soils, the repair may need more than just a lift.
That’s why a thorough assessment matters so much. A good contractor should explain whether your slab needs lifting, void filling, soil stabilization, crack sealing, or some combination of those services. They should also be willing to tell you when a slab is too damaged, too thin, or too compromised for lifting to be the right answer. Straight answers are worth a lot in this industry.
If you want the short version, here it is: polyjacking is often the better choice for modern concrete lifting because it is lighter, faster, cleaner, and more precise than mudjacking. For many residential and commercial repairs, especially in areas with problematic soils or erosion concerns, polyurethane foam lifting offers real advantages.
Mudjacking still has its place, but it is usually the more traditional option rather than the more advanced one. If your concrete has settled and you want a repair that minimizes disruption while addressing support below the slab, polyjacking is often worth serious consideration.
Uneven concrete is more than an eyesore. It can create trip hazards, drainage issues, structural stress, and the kind of nagging worry that gets worse every time it rains. Whether it’s your driveway in Marietta, a porch in Powder Springs, or a garage slab somewhere else in Metro Atlanta, the best repair starts with understanding what’s happening below the surface.
At Fortify Atlanta, we help homeowners and businesses identify the real cause of concrete settlement and recommend solutions built for long-term value. If you’re weighing polyjacking vs mudjacking and want an honest assessment of what makes sense for your property, reach out for a free estimate. Sometimes the slab just needs a lift. Sometimes the soil underneath needs a smarter plan. Either way, it’s better to know now than pay for the same problem twice later.
