I am working on a project with a wood truss system creating an attic
space. The suspended ceiling is 3-4 ft below the bottom chord.
Insulation is to be installed between the bottom chords of the
trusses and held in place with strapping. Sprinklers will be
installed in the attic and below the ceiling. Section 8-14.1.2.13 of
NFPA 13 states "Concealed spaces below insulation that is laid
directly on top of or within ceiling joists in an otherwise
sprinklered attic shall not require protection." Would this be apply
to the situation above? I think it boils down to whether the bottom
chord of the truss would be considered a ceiling joist if the actual
ceiling is not attached to it. If it would apply, would there be any
restriction on how the insulation is held in place? If this is not
applicable, in what situation would it apply? I have never had the
opportunity to use this section before and would appreciate some
clarification.
I trust this will be somewhat less contentious that some of the other
recent posts..
Thanks.
Todd G. Williams, PE
Fire Protection Design/Consulting
Stonington, Connecticut
860-535-2080
www.fpdc.com
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