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3 Hour Fire Rated Ceiling Assembly[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: 3 Hour Fire Rated Ceiling Assembly
- From: "Jim Lutz" <Jim.Lutz(--nospam--at)bhcconsultants.com>
- Date: Tue, 18 Mar 2008 16:58:20 -0700
Title: 3 Hour Fire Rated Ceiling Assembly
I have a 40 ft x 28 ft single story wastewater treatment building that is classified F-1 except for a small area which is classified H-2 because of some process considerations. The building code requires a 3-hour fire separation between the occupancies.
The building is CMU with timber trusses and plywood roof sheathing. The bottom chord is about 10 ft off the floor. I plan to enclose my H-2 area with 8” CMU walls, which gives me the required rating for the walls, and provide a 3 hour rated ceiling over the H-2 room with a ceiling height of about 8’-8”. I was thinking I could use cold formed steel joists with maybe three layers of 5/8” Type X GWB attached to metal runners under the joists, but I can’t find anything like that that’s a pre-approved system. I would like to avoid having to cast a heavy concrete slab over the room just to get the fire resistance. I could avoid the problem by just calling the whole building an H-2 occupancy, which would make the separation requirement go away, but I think that would trigger more expensive electrical work in the non-hazardous area.
Anybody have experience with simple 3-Hour rated ceiling systems that don’t involve concrete slabs?
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