I am building mid-rise wood framed multi-family buildings and am looking into some of the concealed space options available in NFPA 13.
18.104.22.168.17 permits the omission of sprinklers in the concealed space between the underside of wood joists and top of a limited combustible suspended ceiling as long as the joist space is filled with noncombustible insulation within 2 inches of subfloor above.
It is 22.214.171.124.17.1 that I am looking for insight on. It requires that the exposed bottom chord of the joists that would be exposed to the concealed space is faced with a noncombustible product installed as per manufacturers specifications.
Is there a product that has been recognized to satisfy this requirement?
I was thinking about overlaying the fiberglass insulation used to fill the joist cavities to cover the bottom of joist. While it would be full depth in the 2x6 joist, I would compress it and mechanically fasten it so that the joists would not be exposed to the concealed space below.
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