I'm working on a renovation of a 10,000 SF butler style building (metal building). The project is to convert from a warehouse to an office / business use. The project doesn't have many fire rating requirements, but we do end up with a rated corridor, that has a total occupant load of 60, so we need a 1 hour rated corridor.
I'm struggling with detailing this corridor. We cannot take the walls to the deck, because the roof is typical of a metal building in that the insulation is batt insulation on the inside, and the metal roof deck is also the roofing, so we can't screw studs to it.
We can attach studs / track to the purlins, but this leaves a gap of 8" above the top of the wall, which is too much to fire safe.
I considered doing a rated ceiling in the corridor, but then the inside (room side) gypsum board isn't continuous either.
Here's my current detail. Not sure if it works, please advise.
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David Sisson AIA
Architect
David Sisson
Providence RI
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