I know I'm a Luddite, and it is probably a moot point anyway since I'll never be able to afford a new-construction house, but I still don't trust OSB for subfloor or roof decking, or corner sheathing. It just looks and feels wrong. I suppose it is okay for the web in engineered joists, which seem to be the modern standard, but anything facing the weather, I want real plywood.
-- aem sends...
Cover it with a tarp? A sheet of plastic will do, it is good insurance to have a roll on hand just in case. Getting ply wet for an extended period of time will weaken it, possibly it will fall apart.
I used PT against the concrete floor. Most PT 2x4s are soaked in chemical and as they dry they split, warp and twist and introduce internal stress. Horrible stuff as it dries.
For internal use it is approved ONLY for sills in contact with concrete.
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