[TenTec] equipment storage?

[Stuart Rohre]

Likely, going to publications on line for "Fire Resistive Construction, 
Drywall" will show you the latest preferred thickness.  Certainly, metal 
studs seem appealing but heavy timber actually lasts longer in a fire! 
You can coat timber with a fire retardent foam material, which is also 
excellent insulation.  That might give you the weather resistance you 
need for Archival storage.

Stuart Rohre
K5KVH