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Many factors are involved in settling concrete:
There are two methods to raise and support sunken or unstable concrete slabs: polyurethane foam concrete raising and mudjacking.
Polyurethane concrete raising and repair uses a foam material that is injected under the slab. When the components of polyurethane are mixed, a reaction causes the material to expand.
By drilling small holes and pumping material under the concrete slab, expanded foam fills any voids beneath the slab and raises concrete.
Chesapeake Concrete Raising, LLC uses the polyurethane concrete raising method because the holes are smaller than the mudjacking method and the concrete repair is less noticeable when completed. Driveways, sidewalks, patios, steps, and stoops are all made safer and more stable with minimal cost and maximum benefit.
Watch concrete raising with polyurethane on YouTube here.