When you say DIRECTLY attached ceiling, is there a C channel (used to
dampen sound transmission through the floor assembly) or does the
ceiling actually touch the wood chord? If there is a C channel, the
dreaded 3-1/2 inches of insulation is required in order to omit
sprinklers from the concealed space.
As Joe quoted (from the Sprinkler HANDBOOK), the 3,000 sq ft remote
area does not apply YET. The TC is changing that for the 2010 edition
(watch for the exciting new book NFPA 13 ROP to be released next month)
Roland
On May 15, 2008, at 1:01 PM, Russell wrote:
Again I’ve come across something I’ve never dealt with so I am going
to need
your help please. Recently there has been discussion concerning the
fact
that NFPA13R occupancies cannot be over mercantile occupancies that
are not
incidental to the residential occupancy. What I have is a three story
building with mercantile on the ground level. The other two floors
above are
apartments. The entire building is designed by NFPA13 standards. The
apartments are designed using the “Dwelling” section of NFPA13. So
far I’m
okay I think, but now I find that the floor system for second and
third
floor is comprised of “TJI” composite wood joist with the ceilings
directly
attached thus creating combustible concealed spaces and requiring the
dreaded minimum 3000 sq. ft. design area. The question is does this
now make
the use of NFPA13 “Dwelling” null and void? It would appear to me
that it
would, but I need other opinions/rulings.
Thanks,
Russell
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