Vapor barrier over plywood subfloor?
I purchased a laminate floor that I want to use in my house to replace worn carpet. The subfloor is plywood and it is over an unconditioned crawlspace and the home is located in North Florida so humidity/ moisture are a factor. I've heard that the 6 mil polyethelene should not be used as it would trap moisture in the plywood which may lead to rot or mold; however, that is what the manufacturer of the flooring is suggesting.
What kind of vapor barrier/retarder should I use between the plywood and laminate? Would 15# tar paper work? Or is there something more suited to this installation?