If you found yourself between the ceiling and the drywall (think of Fantastic Voyage and being in a submarine) you won’t see any exposed combustible construction. All is well…..no sprinklers required.
If you piloted your submarine to the space between the layers of drywall, you’ll see the wood joists. Now you’re in an exposed combustible concealed space to which you would look to other exemptions (e.g., 8.15.1.2.3) to get you out of the space and unshink (probably not a word) you back to normal size. From: Sprinklerforum [mailto:[email protected]] On Behalf Of Mick Dugal Sent: 2017/03/20 1:38 PM To: [email protected] Subject: Re: Concealed Combustible Spaces with Gyp Bd? Right, but then it directs you to the exceptions: 8.15.1.2.1* Concealed spaces of noncombustible and limited-combustible construction with minimal combustible loading having no access shall not require sprinkler protection I would think the above code applies but does adding 2 layers of 5/8" drywall make wood framing noncombustible *construction*? If not, then I wonder about: 8.15.1.2.10 Concealed spaces where rigid materials are used and the exposed surfaces have a flame spread index of 25 or less, and the materials have been demonstrated not to propagate fire more than 10.5 ft (3.2 m) when tested in accordance with ASTM E 84, Standard Test Method of Surface Burning Characteristics of Building Materials, or ANSI/UL 723, Standard for Test for Surface Burning Characteristics of Building Materials, extended for an additional 20 minutes in the form in which they are installed, shall not require sprinkler protection. On Mon, Mar 20, 2017 at 10:32 AM, Roland Huggins <[email protected]<mailto:[email protected]>> wrote: Start with the opening paragraph 8.15.1.1 where it states - EXPOSED combustible construction shall be protected Roland Huggins, PE - Senior VP Engineering American Fire Sprinkler Assn. Dallas, TX http://www.firesprinkler.org<http://www.firesprinkler.org/> Fire Sprinklers Saves Lives On Mar 16, 2017, at 1:42 PM, Mick Dugal <[email protected]<mailto:[email protected]>> wrote: Would a wood framed corridor rocked with 2 layers of 5/8" gyp bd (a UL listed assembly) and a dropped acoustical grid ceiling still require sprinklers? Would NFPA 13 :8.15.1.2.10 permit the exclusion of sprinklers from such a space? 8.15.1.2.10 Concealed spaces where rigid materials are used and the exposed surfaces have a flame spread index of 25 or less, and the materials have been demonstrated not to propagate fire more than 10.5 ft (3.2 m) when tested in accordance with ASTM E 84, Standard Test Method of Surface Burning Characteristics of Building Materials, or ANSI/UL 723, Standard for Test for Surface Burning Characteristics of Building Materials, extended for an additional 20 minutes in the form in which they are installed, shall not require sprinkler protection. _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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