May 5, 2026
If you have a driveway slab that has sunk, a garage floor that has dropped, or front steps that are starting to pull away from the house, you have probably heard a few different repair terms thrown around. Mudjacking. Slab lifting. Concrete leveling. Foam injection. Polyjacking. For most homeowners, it all sounds like contractor language until the trip hazard is sitting right outside the front door.
Polyjacking is one of the most effective modern ways to lift and stabilize settled concrete without tearing it out and replacing it. Instead of demolishing the slab, contractors inject an expanding polyurethane foam beneath the concrete. That foam fills empty spaces, compresses weak zones, and applies enough upward pressure to carefully raise the slab back toward its proper position.
In simple terms, polyjacking is concrete lifting with high-density foam. It is often used on driveways, sidewalks, patios, garage floors, pool decks, porches, steps, and certain interior slabs. For property owners in Marietta, Powder Springs, and across Metro Atlanta, it is often a faster, cleaner, and less disruptive solution than full replacement.
Polyjacking is a concrete repair method that uses expanding polyurethane foam to lift settled concrete slabs and restore support beneath them. Small holes are drilled through the slab, and the foam is injected below the surface. As the material expands, it fills voids, improves support, and can gently raise the concrete.
The reason this works so well is that settled concrete is often not the real problem. The slab is just the victim. The actual issue is usually happening underneath it. Soil may have washed out, compacted poorly, shrunk during dry weather, or shifted because of drainage issues. When that support disappears, concrete starts to sink, tilt, crack, or separate.
Polyjacking addresses that hidden problem from below. It is not a cosmetic patch. It is a structural support process designed to fill gaps and restore bearing where the slab has lost contact with the ground.
Think of settled concrete like a heavy tabletop with one leg slowly sinking into soft ground. The top starts to tilt, not because the tabletop failed, but because the support under it changed. Concrete behaves the same way. Once the soil loses strength or voids develop under the slab, gravity takes over.
During a polyjacking repair, a contractor drills small injection holes in strategic locations. Then a two-part polyurethane material is pumped beneath the slab. After the materials combine, they react and expand into a rigid foam. That foam moves into empty spaces, presses into weak areas, and provides lift where conditions allow.
The lifting process is controlled in real time. This is important because good concrete leveling is not brute force. It is precision work. The goal is not to jack the slab wildly upward like a car on a floor jack. The goal is to carefully recover elevation, reduce rocking or deflection, and restore stable support without causing unnecessary stress.
Once the slab is lifted and supported, the drilled holes are patched. In many cases, the area can be used again quickly, which is one reason foam lifting has become such a popular alternative to replacement.
Concrete rarely settles for no reason. In Georgia, and especially around Metro Atlanta, there are several common causes behind sinking slabs. Water is one of the biggest. Poor drainage, downspouts dumping too close to the house, leaking plumbing, erosion, and runoff can all wash away or weaken the soil under concrete.
Another common issue is poor compaction during construction. A slab may be poured over fill soil that was never properly compacted. That soil can slowly consolidate over time, especially under repeated loads like parked vehicles in a driveway or garage. At first, the change is subtle. Then one day you notice the crack, the low spot, or the step that suddenly feels off.
Tree roots, shrinking and swelling soils, buried debris, and deep fill zones can also contribute. In some cases, a slab may bridge over a void for a while before the signs become visible. That is why a settled slab is not something to ignore. What looks like a minor cosmetic issue may actually be evidence of a larger support problem underneath.
People often compare polyjacking to mudjacking because both methods are used to lift concrete. The basic idea is similar: inject material beneath the slab to fill voids and raise it. But the materials and performance are very different.
Mudjacking uses a heavier slurry, usually made from a mixture of cement, soil, sand, or other fill materials. It has been around for a long time and can still be useful in some situations. But because it is heavy, it adds more weight to the already struggling soil beneath the slab. That can be a drawback when weak soils or erosion are part of the original problem.
Polyjacking uses lightweight polyurethane foam instead. The foam expands rapidly, can be installed through smaller holes, and does not burden the subsurface with the same extra weight. It also tends to allow for more precise lifting. That precision matters on garage floors, walkways, porches, and areas where matching elevations and reducing trip hazards are critical.
For many property owners, the cleaner installation is another advantage. Smaller drill holes, less mess, and faster cure times make foam lifting appealing when you want the repair done with minimal disruption.
Polyjacking is versatile, which is one reason it shows up in both residential and commercial concrete repair. Around homes, it is commonly used for sunken driveways, uneven sidewalks, settled front steps, porches, patios, pool decks, and garage floors. It can also help with certain interior slabs where voids or settlement have caused cracking or deflection.
Commercially, foam lifting may be used on warehouse floors, loading areas, walkways, retaining slab sections, equipment pads, and other concrete surfaces where downtime matters. A business often cannot afford to shut down access for days while concrete is removed and repoured. In those cases, lifting the existing slab can be the practical answer.
That said, not every slab is a candidate. If the concrete is shattered, too thin, badly deteriorated, or the underlying conditions are severe enough to require a different structural solution, replacement or another repair method may be more appropriate. A trustworthy contractor should say that plainly.
One of the biggest benefits of polyjacking is that it preserves the concrete you already have. If the slab is still in decent condition, replacing it can be like throwing away a whole door because one hinge came loose. The smarter move is often to restore the support underneath and keep the slab in service.
Another major advantage is speed. Foam lifting projects are often completed in hours rather than days. There is no demolition crew, no haul-off, no forming and pouring, and no long cure time while everyone tiptoes around the repair. For homeowners, that means less disruption. For businesses, it can mean less downtime and less lost access.
Polyjacking is also valued for precision. Because the foam expands in a controlled way, contractors can make careful adjustments during the lift. This helps when trying to reduce trip hazards, re-support settled slabs, and improve drainage flow away from structures.
And then there is the issue of weight. Lightweight foam is especially useful where adding more load to compromised soils would be a bad idea. In situations involving voids, erosion, or weak fill, that can make a real difference.
This is where honesty matters. Polyjacking is durable and long-lasting, but no repair exists in a vacuum. If the root cause of settlement continues unchecked, even a good repair can be challenged over time.
For example, if a driveway is lifted but the downspout still dumps water beside the slab every time it rains, the same erosion cycle may continue. If a garage floor is stabilized but there is an active plumbing leak under the slab, the soil conditions may keep changing. Foam is strong, but it cannot negotiate with bad drainage forever.
When done properly and paired with correction of contributing issues, polyjacking can provide lasting support. That is why experienced contractors do more than just inject foam and leave. They inspect the site, look for erosion patterns, identify likely causes, and explain whether drainage, moisture management, or other repairs should happen alongside the lift.
Many homeowners wait too long because they assume the slab issue is just cosmetic. But concrete usually gives warning signs before the problem becomes more expensive. One of the most obvious signs is uneven concrete. If one section of sidewalk sits lower than the next, or your driveway has developed a dip that was not there before, settlement may be underway.
Cracks can also point to loss of support, especially when paired with movement, separation, or rocking. Maybe your front steps are pulling away from the porch. Maybe your garage floor has dropped enough that water runs the wrong direction. Maybe a patio slab feels hollow or sounds different in one corner. Those are not random quirks. They often mean there are voids or weak soil under the slab.
Sticking doors near a settled slab, pooling water, gaps under concrete edges, and visible separation between slabs are also clues. The sooner those issues are evaluated, the more likely it is that lifting and stabilization can solve the problem before replacement enters the conversation.
In the Marietta, Powder Springs, and greater Metro Atlanta area, soil and drainage conditions can create real challenges for slabs and shallow concrete structures. Some properties are built on fill areas. Others deal with runoff, sloped lots, retaining walls, or clay-heavy soils that behave differently during wet and dry cycles.
That local context matters. Concrete settlement in Georgia is often tied to what is happening under the surface, not just what is visible above it. A slab that has settled near a downspout, a ravine lot, a retaining wall, or an area of previous excavation may need more than a quick patch. It needs a repair strategy that takes subsurface conditions seriously.
That is why local experience counts. A contractor familiar with Atlanta-area settlement patterns is more likely to recognize whether the issue is a simple slab lift, a void filling situation, or part of a deeper soil stabilization problem. The right solution depends on the cause, not just the symptom.
A good polyjacking project starts with a real assessment, not a sales script. The contractor should inspect the slab, measure settlement, look for cracks and void indicators, and ask questions about drainage, water intrusion, and site history. If someone gives you a price in two minutes without trying to understand why the slab moved, that is a red flag.
Once the repair plan is set, the crew drills small holes in the concrete and begins injecting the polyurethane foam beneath the slab. The lift is monitored carefully as the material expands. In some cases the goal is full elevation recovery. In others, the goal is stabilization and partial lift without over-stressing the slab. The best outcome depends on the condition of the concrete and what the site will safely allow.
After the injections are complete, the holes are patched and the area is cleaned up. One of the reasons homeowners like foam lifting is that the process is relatively non-invasive. There is no giant excavation and no need to live with a torn-up driveway for a week.
Sometimes yes. Sometimes no. If the slab is structurally sound but unsupported, polyjacking is often the better value. It is faster, less disruptive, and usually more cost-effective than demolition and replacement. It also addresses the support problem beneath the slab, which replacement alone may not fix if the same bad soil remains underneath.
But replacement may be necessary when the concrete is too damaged, too thin, or too deteriorated to save. A slab with severe structural failure is not a good candidate for lifting just because foam exists. This is where an honest contractor earns trust. The right answer is not always the one with the flashiest technology. It is the one that actually fits the site conditions.
For many homeowners, the smartest path is to have the slab evaluated before assuming replacement is the only option. A lot of concrete that looks like a lost cause can actually be lifted, stabilized, and kept in service for years.
So, what is polyjacking? It is a modern concrete leveling method that uses expanding polyurethane foam to fill voids, stabilize weak support, and lift settled slabs. It is clean, efficient, precise, and often far less disruptive than tearing out concrete and starting over.
More importantly, polyjacking solves the kind of problem that too many people ignore until it becomes bigger than it needed to be. A sinking slab is rarely just a surface issue. It is a sign that the ground underneath is no longer doing its job. Foam lifting works because it addresses that hidden failure zone directly.
If you are dealing with uneven concrete in Marietta, Powder Springs, or the surrounding Metro Atlanta area, it is worth having the slab inspected by a contractor who understands concrete lifting, void filling, and soil stabilization. Sometimes the difference between a manageable repair and a major replacement project is simply catching the problem early.
If your driveway, garage floor, porch, walkway, or patio is settling, Fortify Atlanta can help evaluate the cause and recommend the right repair approach. In many cases, polyjacking offers a practical way to restore safety, support, and peace of mind without the cost and chaos of replacement.
