A standard four-inch thick residential concrete slab poured with a typical 3,000 to 4,000 PSI concrete mix can generally support normal residential foot traffic, furniture, and standard automobiles (roughly 2,500 to 3,000 pounds per square inch of ultimate compressive strength, though distributed safe loads depend heavily on the compacted sub-base). However, heavy commercial vehicles or concentrated point loads require thicker slabs and rebar reinforcement.
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