I'm using regular (not pressure treated) wood as my baseplate. Should the vapor barrier under this piece be wide enough to lay flat on the concrete floor (between the concrete wall and the studs) or be long enough to fold up the wall a few inches?
I would use pressure treated lumber where it comes in contact with concrete. There is the sill gasket or plastic will work, but the main concept is to prevent any moisture from the concrete being absorbed by the wood. Remember, this is the bottom of your walls so you don't want to encourage moisture (rot or mould.) spend the extra and do it correctly.
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