Sunken Concrete Repair
Sunken concrete can create trip hazards, drainage problems, and uneven surfaces around your home or business. Pro Polyjacking provides professional sunken concrete repair throughout the Kansas City area using lightweight polyurethane foam to raise settled slabs, fill underlying voids, and stabilize weakened soil. Compared with traditional mudjacking, polyjacking adds far less weight beneath the concrete and provides a fast, water-resistant solution designed for long-term performance.
"WHAT IS IT?"
Why Sunken Concrete Can Become a Serious Problem
Concrete typically begins to sink when the soil beneath it can no longer provide consistent support. In the Kansas City area, expansive clay soils can swell during periods of heavy rain and contract during hot, dry weather, while winter freeze-thaw cycles place additional stress on both the concrete and the ground beneath it. Poor compaction, erosion, improper drainage, plumbing leaks, and water moving beneath a slab can also create empty spaces that allow sections of concrete to settle. Once movement begins, the problem can continue to grow. Driveways can develop uneven joints that affect vehicles, sidewalks can become trip hazards, patios may begin directing water toward a foundation, and garage floors or other slabs can develop increasingly noticeable slopes and gaps. Water can also enter beneath already settled concrete and contribute to further erosion or soil movement. Professional sinking concrete repair addresses the underlying loss of support rather than simply covering cracks at the surface. If the slab itself remains structurally sound, technicians can often repair a sunken slab by restoring support underneath it and carefully returning the concrete toward its proper elevation before more extensive damage develops.
"WHen to MUDJACK?"
Why Polyjacking Is Better Than Mudjacking for Sunken Concrete
Traditional mudjacking can raise settled concrete, but it does so by pumping a heavy mixture of water, soil, and cement beneath the slab. Pro Polyjacking reports that cured mudjacking slurry weighs approximately 100 pounds per cubic foot, compared with just 2 to 4 pounds per cubic foot for polyurethane foam. That weight difference is particularly important for settled concrete repair because the underlying soil has already demonstrated that it cannot adequately support the existing load. Adding hundreds or even thousands of pounds of additional slurry can place more stress on the same weakened soil. Polyurethane provides the lifting force necessary for sunken concrete repair while adding very little additional weight beneath the slab.
Polyjacking also does more than simply push the concrete upward. As polyurethane is injected beneath the slab, it expands into available voids, compresses loose soil, and creates a stable layer of support beneath the concrete. The foam is hydrophobic, meaning water will not wash it away the way moisture can gradually erode soil-based mudjacking material. That characteristic is especially valuable around Kansas City, where clay soils, spring rainfall, summer drought, drainage changes, and winter weather can repeatedly affect the ground beneath concrete. For property owners looking to repair a sunken slab, polyurethane addresses both the empty space beneath the concrete and the instability that helped cause the settlement.
Polyjacking also provides a cleaner and less disruptive approach to sinking concrete repair. Mudjacking generally requires holes approximately 1⅝ to 2 inches in diameter, while polyurethane is injected through approximately dime-sized openings. Those smaller holes leave less noticeable patches in driveways, patios, sidewalks, garage floors, and other highly visible surfaces. Polyurethane also cures within minutes, and Pro Polyjacking states that treated concrete can generally return to use in about 15 minutes, compared with 24 to 72 hours for traditional mudjacking. For structurally sound concrete that has simply settled, polyjacking provides an efficient way to restore elevation and support without replacing the entire slab.
Frequently Asked Questions About Sunken Concrete Repair
What causes concrete to sink in Kansas City?
Concrete commonly sinks when the soil beneath it settles, erodes, contracts, or was not properly compacted during construction. Kansas City’s expansive clay soils can repeatedly swell when wet and shrink during dry periods, while freeze-thaw cycles create additional seasonal movement. Poor drainage and water flowing beneath the slab can also remove supporting soil and create voids that eventually lead to settlement.
Can you repair a sunken slab without replacing the concrete?
Yes, in many cases. If the concrete remains structurally sound and the primary problem is settlement, polyurethane injection can repair a sunken slab by filling voids beneath it, stabilizing loose soil, and carefully lifting the concrete toward its proper elevation. Concrete that is badly crumbling, severely spalled, or fractured into numerous pieces may require replacement instead.
Is polyjacking better than mudjacking for sinking concrete repair?
Polyjacking offers several advantages for sinking concrete repair. Polyurethane foam is significantly lighter than mudjacking slurry, is hydrophobic, requires much smaller injection holes, and cures substantially faster. The expanding foam also fills voids and helps stabilize loose soil, making it particularly useful where soil movement or moisture contributed to the original settlement.
How long does settled concrete repair with polyurethane take to cure?
Polyurethane cures very quickly. Pro Polyjacking states that concrete treated with polyurethane can typically return to normal use in about 15 minutes, while traditional mudjacking generally requires approximately 24 to 72 hours before the slab is ready for heavy use. This faster curing time can make settled concrete repair much less disruptive for driveways, sidewalks, patios, and commercial concrete surfaces.