I'm not convinced it's necessarily the floor that is the biggest culprit; the nite/day temperature fluxuations can't be that great to induce a great amount of condensation leading to humidity.

What I have seen, especially in commercial buildings made of block walls is the walls are the biggest offender for two reasons: they are exposed to the sun and ambient heat acting like radiators and condensors. Also, if the building was not built right--like if the block is not far enough up off the foundation, moisture will wick its way up the block from inside---or like I have seen in self-storage buildings-- the roof and gutter systen was dumping water or wind-driven rain into the block which eventually acts like a vertical reservoir slowly seeping moisture into the building. Evidence of this is effloresence(sp) (whitish, powdery salts) in the mortar or crumbling mortar.
I'd suggest furring out the block walls and insulating them. And you'll need to put some sort of luan or drywall up too. A vapor barrier is also necessary, but talk to builders who speacialize in this aspect because there have been lawsuits here in Michigan resulting from bad national building codes requiring vapor barrier which caused rot between the walls. I forget which is the right way to place it so check into it.

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