I still need to verify, but it looks like it’s going to have a limited-combustible facing that is stapled in place. For the sake of this argument, let’s assume that is the case. So, it would be most similar to Figure A.8.15.1.2.17, with the following differences:
1. It’s a steel bar joist with wood nailer, rather than a composite or solid wood joist. 2. The insulation doesn’t cover the entire depth of the joist. But it does cover the wood (combustible) part, which I think is the only part that matters. I can’t see any good reason why it would be OK to omit sprinklers in the scenario described by Figure A.8.15.1.2.17 and not in the scenario that I described. But perhaps I am overlooking something. -Kyle M From: Sprinklerforum [mailto:[email protected]] On Behalf Of Fpdcdesign Sent: Tuesday, October 23, 2018 8:05 AM To: Sprinklerforum <[email protected]> Subject: [EXTERNAL] Re: Combustible Concealed Space How do they intend to secure the insulation? Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080 (ofc) 860-553-3553 (fax) 860-608-4559 (cell) On Oct 23, 2018 at 10:48 AM, <Kyle.Montgomery<mailto:[email protected]>> wrote: I’m looking at a building with steel bar joists with a wood nailer and plywood deck. The building will have a drop ceiling, and of course have pendent sprinklers protecting the area below the ceiling. If there is insulation at the deck that covers the deck and wood nailers, do I need upright sprinklers protecting the area above the ceiling? It seems like I would not, but I’ve gone through the section with the combustible concealed space exemptions and I haven’t found one that exactly matches my scenario. -Kyle M _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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