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Roof Assemble Fire Rating[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Roof Assemble Fire Rating
- From: rlewis(--nospam--at)techteam.org (Richard Lewis)
- Date: 31 Jul 1998 18:54:42 GMT
I am working on the design of a classroom addition to a church. The building construction must be noncombustible. The roof requires a one hour assembly rating. The existing church building has an asphalt shingle roof. The Architect wants to have asphalt shingles on the new addition. The roof is a hipped roof shape with a 4:12 pitch. I am constructing the roof with long span bar joists with sloping top chord and a horizontal bottom chord. I am trying to find a UL one hour rated roof assembly but haven't found one. I envision it to include gyp board ceiling applied to under side of joist, metal roof deck, some kind of non-combustible nailboard, perhaps bonded to insulation, and then the asphalt roof shingles. The code excludes fire retardant treated plywood, and I don't think I would be comfortable with it even if it was allowed. I can't be the first one to run into this problem. Does anyone have some guidance of how I can get a one hour rated roof assembly on a sloped roof with asphalt shingles? Thanks in advance. __________________________________________________ Richard Lewis, P.E. Missionary TECH Team rlewis(--nospam--at)techteam.org The service mission like-minded Christian organizations may turn to for technical assistance and know-how.
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