I was at re-store today and they had a lot of what looked like 1/2 inch particle board for $5 per piece, pieces were different sizes but at least 4 ft. I was wondering if I could use that for the coop I want to build (something in the order of 8'x8'x8'). Is this stuff usable as cladding on the outside walls, or is it interior use only? How about the floor? Could I use it for next boxes? Does this stuff emit toxic fumes which would be bad for the chickens' health?