Never wrap wood in plastic. When I started at secondary school, they were in the process of having a new floor put in the gym. It was the games master's pride and joy, nobody, not even parents, was allowed to go in there with outdoor shoes on in case they damaged it. After a couple of years the boards started to come loose, and they found that the people who built it had sealed it with a plastic sheet. It all had dry rot, and had to be replaced with a much cheaper one. Serve the sadistic bastard right.