I have a flat deck over an attached shed. Right now it has rolled roofing material on it is there any other product I can use. A local contractor here in Connecticut suggested a material called VERSADEK. It is a waterproof material a lot like vinyl. Another contractor suggested a floating wood deck. I remember seeing a home improvement show with a self sealing rubber membrane that can be nailed through without water damage below. Any information would be helpful. Also would tile work on this type of outdoor project.