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A concrete floor must make firm contact with the supporting subgrade for moving and static loads to be spread uniformly over the slab. However, this near touch will fail if a gap forms between the slab and the subgrade, placing stress on the concrete. When the floor breaks and settles at a lower level than the surrounding regions or wheeled loads roll over a joint, the gap becomes noticeable. Curling at joints, joint breakdown, and heaving are all signs that the slab's desired interaction with the subgrade has been harmed.
Concrete slabs are usually $6 per square foot or $4 to $8 per square foot, including labor. For a standard 30-by-30-foot slab that's 6 inches thick, that's around $5,400, or between $3,600 and $7,200. The cost of materials alone is about $4 per cubic foot.