We used white board on the walls and ceiling. We sealed the seams with either acrylic spray or silicon sealer. The electrical outlets were waterproof. The floor was sheet linoleum, with a deck drain.
The window was left because this is a double duty room, also used as a brooder for broiler in the spring. It has a piece of insulation that goes into it when the room is used for hanging.
Eventually the doors will be covered with insulation also.
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