If you are referring to FRP Board, it's what I used in my mews. Put them in over six years ago and they still look brand new. Mutes clean off easily. I live in east Texas, HOT and humid in the summer, gets below freezing (usually) a few days each winter. Boards seem fine with that. The inside walls in my mews are insulated, then a layer of plywood sheeting. The FRP boards are glued to the plywood. Trimmed out properly (with special trim for FRP use). No issues.