Well I've seen this (or equivalent bastard versions of this) several times before and I agree with your surmise that there's nothing to, "...absolve you of installing 3 levels of protection."
Now if somebody wants to fill the space above the fiberboard with non-combustible insulation, you get an exception that way but that's not usually the first choice in this type of a situation. Good luck, Steve L. From: Sprinklerforum [mailto:[email protected]] On Behalf Of John Irwin via Sprinklerforum Sent: Thursday, January 09, 2020 12:15 PM To: [email protected] Cc: John Irwin; JD Gamble Subject: RE: Concealed Combustible 25 years in this business ... still new situations every week. Amazing. Wish I had some guidance for you JD. My gut says there isn't anything specific to this situation to guide you or absolve you of installing 3 levels of protection ... My feeling is that protection ABOVE the fiberboard (along with sprinklers below the ACT) should be good. If the fiberboard burns, I'd rather have sprinklers above it than below ... John Irwin Quick Response Fire Protection "The bitterness of poor quality remains long after the sweetness of low price is forgotten." - Benjamin Franklin From: Sprinklerforum <[email protected]> On Behalf Of JD Gamble via Sprinklerforum Sent: Thursday, January 9, 2020 3:11 PM To: [email protected] Cc: JD Gamble <[email protected]> Subject: Concealed Combustible I would like to query greater minds than mine on is a space CC or Not .... Basis of Code is NFPA 13 2016ed. Spaces above Ceiling, Below Floor Above: Situation is an Acoustical Grid Ceiling with 2x4 lay in tile (standard construction) 2' below metal open web joists (14" Depth) with attached FiberBoard. Essentially creating 3 spaces of consideration: The floor space below the ceiling, the space above the ceiling between the ceiling and the fiberboard, and the space above the fiberboard to the deck/floor above. The fiberboard being the combustible factor, would / should you extend coverage above and below it? Thanks In Advance for your thoughts. JD Gamble 307-763-3361 [LSS Inc Logo - Color]
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