Actually, the coating would be allowed under the equivalency clause with approval of the AHJ.
With AHJ approval, the 3000 sq ft rule could also be ignored. Some years ago, I made the mistake of saying no to this question while doing interpretations for NFPA as a consultant and almost got them sued over my response - so I know this answer really well.... Bob Caputo On Wed, Feb 10, 2021 at 11:44 AM tstone52--- via Sprinklerforum < [email protected]> wrote: > 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 > <https://www.google.com/maps/search/117+Old+Stage+Rd.+-+Essex?entry=gmail&source=g> > Jct., VT. 05452 > > CELL: (802) 373-0638 TEL: (802) 434-2968 > > <mailto:[email protected]> [email protected] > > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
