Concrete Slab Leveling (Mudjacking & Foam Lifting)

Why slabs sink and when lifting works

Slabs sink when soil erodes, compacts or washes out beneath them, often because of poor drainage, leaking pipes, or tree roots drawing moisture. If the slab itself is in good shape and the soil void is the problem, lifting is an economical fix. Slabs that are badly cracked or crumbling may be better replaced. A specialist inspects the area, measures the dips and checks drainage and gutters, since fixing the water source prevents repeat settlement.

Mudjacking versus foam lifting

Mudjacking pumps a cement slurry through holes about the size of a coin, filling the void and lifting the slab. It is economical but heavier and uses somewhat larger holes. Polyurethane foam is lighter, uses smaller holes, cures in minutes and lets you walk or drive on the slab almost immediately, though it costs more per square foot. Both methods can raise driveways, patios, sidewalks, steps and garage floors. The specialist explains which suits your slab and soil.

Results, limits and follow-up

After lifting, the holes are patched, and the slab may be sealed at joints and cracks to keep water out. A lifted slab can be used within hours with foam and within a day or so with mud. Results depend on the slab condition and the soil underneath. Keep an eye on drainage, direct downspouts away from the slab and fix leaks. If settling returns, the cause may still be present. Keep the invoice and photos for warranty purposes. Take dated photos of the sunken area and any gaps between slabs before the visit, so you can compare the result and track whether settling returns.

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