You have a few wall options, depending on budget. Cheapest is the coated wall board, it's the thin MDF stuff. Second on the list is fiberglass wall board. I have found both of them at Home Depot. Third, and best, is PVC. EPI (extrutech) is where I got our cheese room panels and doors from. I saw that Neville McNaughton reps them now. They started out making walls, ceilings and doors for car washes. It was 5 or 6 years ago when we bought the materials, had them shipped out from the factory. I think we were the first to use them, when I told the sales guy on the phone what we were doing he was pretty tickled.
http://www.epiplastics04.com/agriculture.html
