I am putting down a product similar to the plastic used on the DriCore 2x2 sheets on the concrete for a vapor barrier. I have 3/4" tongue and groove Oriented strand board (OSB) I will be laying down on top of it. We will be carpeting over this. I have drywall up that is 1/2 off the floor. How much of a gap should I leave, and should I anchor the wood into the concrete?
I should add that this is in my basement. We moved in, the walls are up but they had carpet glued to the floor. I pulled out the carpet and want to put in a subfloor (above) but am not sure if I should leave a gap or push the wood up tight against the wall.