I'll go out there later today and take some pics. I bought some 1x2x8s from Lowes (about $3/ea.) and made 8' square panels and screwed them together. Then draped visqueen over everything.
I had some left over house wrap from building my house. That is what's covering the floor. It's there mostly to keep the paint off the floor and cut down on the dust/dirt from whatever might be stuck in the porous concrete even after I cleaned the crap out of it. When I was cutting everything in I was just wetting the concrete, but it dried before I finished because it's so stinking hot here. I had to come up with something else.