Concrete leveling raises a sunken slab back to roughly its original position by pumping material underneath it, instead of tearing the slab out and pouring a new one. It works on driveways, sidewalks, patios, and garage floors, and in some cases on interior slabs too, wherever a section of concrete has settled lower than the rest of it.
Settled concrete is not broken concrete, at least not usually. The slab itself is often still structurally fine. What has happened is that the soil underneath has compacted, washed out, or shifted, leaving a gap or a soft spot that the slab has sunk into. Concrete leveling fills that gap and lifts the slab back up, using either of two materials pumped through small holes drilled into the concrete.
A driveway with a lip where it meets the garage floor. A sidewalk section that has become a trip hazard. A patio slab that pools water in one corner. A garage floor that dips near the door. These are the classic candidates. Interior slabs can sometimes be leveled too, though access and the type of flooring sitting on top of them matter more indoors than they do outside.
Both methods lift concrete. They do it differently, and the differences are worth knowing before picking one.
Cost. Mudjacking is typically the cheaper option per square foot. The material, a mix of soil, cement, and sometimes sand or limestone, is inexpensive compared to polyurethane foam. Polyurethane costs more for the material itself, though the smaller equipment and faster job time can close some of that gap depending on the project.
Cure time. Mudjacking mix needs time to set before the slab can handle full weight again, often a day or more before you should drive on it. Polyurethane foam cures within minutes and can typically bear weight the same day, sometimes within the hour, which matters when the driveway is the only way in or out of the property.
Weight. Mudjacking material is heavy, roughly similar in weight to wet sand, and that added weight sits under the slab permanently. Polyurethane foam weighs a fraction of that, which is part of why it can be a better fit over already soft or marginal soil that a heavy fill might just compress again.
Hole size. Mudjacking requires larger holes, roughly the width of a garden hose, drilled in a grid pattern across the slab to pump the material through. Polyurethane needs much smaller holes, often described as dime-sized, and fewer of them, since the foam expands and spreads on its own once injected.
Neither one is simply the better choice. Mudjacking makes sense for a large slab on a tight budget where the extra weight is not a concern. Polyurethane makes sense where fast cure time matters, where smaller holes are worth the extra cost, or where the soil underneath is already soft and cannot handle much more load.
The same clay soil that moves foundations in Longview moves concrete slabs too. Clay swells with water and shrinks as it dries, and a slab sitting on soil that keeps changing volume does not settle evenly. Add to that the way most driveways and sidewalks get poured, often on soil that was disturbed during construction and never fully recompacted, and you get a slab sitting on ground that was already prone to settling before the clay cycle even started.
Water is usually the accelerant. A downspout draining under a driveway slab, poor grading that channels water toward a patio, or a sprinkler head aimed the wrong direction can wash fine soil particles out from under the concrete over time, sometimes called soil erosion or voiding. Tree roots near a sidewalk can do something similar, drawing moisture out of the soil unevenly as they grow. None of this happens overnight. A slab usually settles gradually enough that homeowners notice the trip hazard or the puddle long before they ever notice the cause.
Leveling works when the concrete itself is sound: no major structural cracking, no crumbling surface, no rebar or wire mesh exposed and rusted through. If a slab is intact but sitting at the wrong height, pumping material underneath and lifting it back into place is faster and cheaper than demolition and a new pour.
Replacement is the better call when the concrete is broken into several pieces, badly cracked through its full thickness, spalling or crumbling on the surface, or has settled unevenly enough that lifting it would just open the cracks wider instead of closing them. A slab that has been patched repeatedly over the years is worth a second look before spending money to lift it, too. There is no point leveling concrete that is going to fail on its own within a year or two regardless of what is done underneath it. A straightforward inspection usually settles which category a given slab falls into.
A typical driveway or patio job is finished in a matter of hours, not days, which is one of the appeals of leveling over a full tear-out and repour.
That depends more on what is happening underneath and around the slab than on the leveling material itself. If the original cause of settling, usually water, erosion, or poor compaction, is still active, the slab can settle again over time even after a good lift. That is why leveling a driveway without also fixing a downspout that dumps water right at the edge of it is really just treating half the problem.
Slabs leveled on stable, well-drained soil tend to hold their position for a long time. Slabs sitting on ground with ongoing drainage issues are more likely to need attention again down the road, regardless of whether mudjacking or polyurethane was used the first time. Addressing drainage around a slab, similar to the drainage work that protects a foundation repair, is the single biggest factor in making a leveling job last.
Concrete leveling typically costs far less than tearing out a slab and pouring a new one, since you are paying for lifting and patching rather than demolition, disposal, forming, and a full concrete pour. Beyond that general comparison, an honest number depends on the square footage involved, how far the slab needs to lift, which material is used, and how accessible the area is for equipment. A small sidewalk section is a different job than a full driveway. The only way to get an accurate figure is a look at the actual slab, which is what a free estimate covers.
Mudjacking is one method of concrete leveling, not the only one. Concrete leveling is the general term for raising settled concrete back into place, and mudjacking (using a soil and cement slurry) and polyurethane foam injection are the two main ways to do it.
Most residential jobs, like a driveway or a patio section, are completed in a few hours to a single day. Cure time before the surface can handle full weight adds more time for mudjacking than it does for polyurethane foam.
Yes, in many cases. Interior work requires more care around flooring, doorways, and equipment access than an outdoor slab does, but garage floors and some interior slabs are regularly leveled using the same injection methods.
It can, if the underlying cause of the original settling, usually water or unstable soil, is never addressed. Leveling on its own does not fix a drainage problem. Pairing the lift with a look at grading and drainage around the slab gives the repair the best chance of holding.
Neither is universally better. Polyurethane cures faster, weighs less, and uses smaller holes, which suits soft soil and fast turnaround needs. Mudjacking generally costs less per square foot and works well for larger slabs where those advantages matter less than the price does.