Project is a 100 year old 6 story Steel & Concrete Hotel building. The roof
is steel framed with concrete above and the Sixth floor ceiling is Plaster
over metal lath. Over the years the building has been added onto with wood
framing above the Sixth floor ceilings.
As Part of a major renovation started in 2020, the installation of a
complete NFPA 13 sprinkler system and Standpipes is taking place.
A few substantial combustible concealed spaces have been discovered
throughout the building on other floors too. If nothing is done the
sprinkler design areas would need to be increased to 3,000 SF as outlined in
Chapter 11.2.3.1.5. The sprinkler contractor and I have suggested filling
these spaces with noncombustible Insulation.
The architect and builder are discussing Flame Retardant Coating to be
applied to the wood framing in order meet the Non-Combustible and Limited
Combustible concealed space definition. In reviewing Chapter 11.2.3.1.5.2 I
don't see where Flame Retardant Coating is an option in order to reduce the
design area.
I believe In order to reduce the Design areas these combustible spaces need
to be filled with noncombustible Insulation.
Would "Flame Retardant Coating" be considered an option as outlined in
A.8.15.1.2.11 (commentary text) the equivalency provisions in Section 1.5?
Thank you for your imput.
Regards,
G. Tim Stone
G. Tim Stone Consulting, LLC
NICET Level III Engineering Technician
Fire Protection Sprinkler Design
and Consulting Services
117 Old Stage Rd. - Essex Jct., VT. 05452
CELL: (802) 373-0638 TEL: (802) 434-2968
<mailto:[email protected]> [email protected]
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