Hi - I am looking for some good ideas for a ceiling inside an old barn. I have an old hay barn with a high slate roof. I have a wood shop and store equipment in the barn. My problem is that the slate roof makes everything dirty, plus there are bats in the barn who make alot of droppings. I would like some kind of ceiling, either temporary or permanent that I could put in that will keep everything cleaner, plus that could be cleaned off on the top side. I could go the route of framing an upper floor covered with plywood but I was wondering if there is an easier and cheaper way to do this. I don't need it for storage, just want to keep everything cleaner. Any suggestions would be greatly appreciated. Thanks!