Uneven, sunken concrete slabs are a common frustration for Olympia homeowners. When soil settles beneath driveways, front entry porches, patios, and garage aprons, the concrete drops, forming hazardous trip edges and allowing rainwater to pool against foundation footings. Faced with this problem, property owners frequently debate between full concrete replacement and modern polyurethane foam lifting.
Tearing out and pouring fresh concrete is exceptionally expensive, disruptive, and messy. Demolition requires heavy equipment that can damage lawns and sprinkler lines, and new concrete takes nearly a month to reach full compressive strength. Worse yet, pouring heavy new concrete over the exact same uncompacted soil often leads to the new slab sinking again within a few seasons.
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Modern high-density polyurethane foam lifting—frequently referred to as polyjacking—provides an elegant, permanent alternative. Installers drill tiny 5/8-inch holes (the diameter of a penny) through the sunken slab. Specialized injection guns pump liquid polyurethane chemicals beneath the concrete. As the two-part polymer reacts, it expands rapidly, filling subterranean voids, compacting loose gravel, and gently hydraulic-lifting the concrete slab back to level alignment.
Polyurethane offers dramatic advantages over older traditional mudjacking methods that used heavy cement-and-slurry mixes. Poly foam weighs only 2 to 4 pounds per cubic foot compared to mudjacking slurry's 100+ pounds, meaning it adds virtually no dead weight to weak soils. Furthermore, polyurethane cures in just 15 minutes, allowing homeowners to drive their vehicles across the leveled driveway immediately after the technician finishes.