A customer is looking for a 1 hr fire rated wall assembly for turkey barns. The Gyp. Assn. representative I spoke with wasn't familiar with this type of situation and didn't seem sure if they had anything acceptable, and is supposed to get back to me. [She said gyp. sheathing should work but would require cladding.] APA says there is no FRT sheathing assembly without (Gyp. board) that would work.
Has anyone had luck with a 1 hr rated wall assembly for wood construction using sheathing material that will withstand the humidity of an ag. building such as this?
Thanks in advance for any help.
Ed Fasula E.I.T.