"David Nebenzahl" wrote

Now for the next part: client would like to be able to walk on the dirt
(uses crawlspace, which is nearly basement height, to store stuff in). How
about throwing down a few sheets, say cheap OSB, over the plastic? Would
that be stupid and attract termites? The idea is to protect the plastic
membrane from being perforated.

Best bet there? You know that green 'grassish' outdoor carpet stuff? You
can get remnants pretty cheap. I'd use that. Wont trap moisture in.

This assumes pouring a base isnt in the plans.