I just finished pouring the floor for my Conversion parking canope. We excavated 12" of dirt & clay, layed a crushed rock base (a couple of inches) then put in 4" of sand. We then layed in 1/2" re-bar on a 24" grid and poured 6" to 7" of 4000 test concrete with fiber added. I've let it cure for 4 weeks & will move the conversion back in tomorrow. I did some of the forms & re-bar work myself so saved a little on labor. The #4000 concrete was $95/cu yard (poured 27 yards), a load of sand was $100, I already had the rock. The labor to do the excavtion, pour & finish the concrete etc, was $1600.
When you do any concrete work, spend what it takes to lay down a good base and don't cheap-out on the re-bar. (do not even think about using that wire mesh crap, it's worthless).
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