Great question — answering as the UphillTech team:
If the entire facility has fire sprinklers, then it doesn't matter, unless there is a "sound rating" requirement. Otherwise: For 1-hour WALLS use 5/8" Type X (fire code) gypsum board on each side. For 1-hour CEILINGS use 5/8" Type X (fire code) gypsum board on bottom of joists spaced up to 16" oc with fire rated assembly on top. (If it's an attic, you'll need fire rated roofing on fire rated assembly.) For 2-hour WALLS use 2 layers 5/8" Type X (fire code) gypsum board on each side. Stagger the joints in the gypsum board both ways (horizontal and vertical) and use approved nailing pattern (length and spacing). Also, there are requirements about extending it beyond the edge of the building...
Full answer by Lee Sam: https://diy.stackexchange.com/a/111524 (CC BY-SA 4.0).
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