Firewall. 2 layers of 5/8 (x2, both sides), offset seams, to be
"firecaulked" (at $15/12 oz. tube).
I told these idiots (oh, yeah, we can hang rock, can o' corn!) to
plumb their first sheet (of the second layer) or they were going to
run into problems. As you can see they ended up shaving finished
edges in order to hit studs. No sweat, I don't have to finish that
For some reason these "experts" declined to finish out the tops of
these 12' walls. That truss is about 3" out from the wall.
I doubt you're ever safer from fire than when in a modern commercial