I have a situation where 18 gauge 2x6" steel studs have been used as ceiling joists with 5/8" type 'X' gyp. bd. both sides. I am unable to find a verifiable hourly rating for this assembly. UL only has floor or roof assemblies. Is there any web sites, or printed info. regarding such an assembly? Even info. on the fire testing of steel in a horizontal application would be helpful. Any info. is greatly appreciated.
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