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On my 40x72 the structure was complete and then they came in and poured to floor to the level of the lower skirt board. I went 6" thick with 3/8 rebar in 24" square sections along with fiber reinforced concrete but I put some heavier equipment on my floor. When the used the power trowel I asked them to leave a slightly rougher surface for slip resistance. Part of my building isn't insulated and some condensation will form when the temperature changes.
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