If all of the exposed surfaces of the concealed space are covered with sheetrock, then they are typically excluded from what I have seen.
Matt From: Sprinklerforum [mailto:[email protected]] On Behalf Of Mick Dugal Sent: Monday, March 20, 2017 11:31 AM To: [email protected] Subject: Re: Concealed Combustible Spaces with Gyp Bd? Anyone have any input? On Thu, Mar 16, 2017 at 4:54 PM, rongreenman . <[email protected]<mailto:[email protected]>> wrote: Is it that obvious? On Thu, Mar 16, 2017 at 2:25 PM, Mick Dugal <[email protected]<mailto:[email protected]>> wrote: Obviously I'm talking about the concealed space above the dropped ceiling. On Thu, Mar 16, 2017 at 1:57 PM, <[email protected]<mailto:[email protected]>> wrote: A corridor is not a concealed space. Is the rest of the area around the corridor sprinklered? What does this corridor serve? Is it for egress? Craig L. Prahl Fire Protection Group Lead/SME CH2M 200 Verdae Blvd. Greenville, SC 29607 Direct - 864.920.7540<tel:(864)%20920-7540> Fax - 864.920.7129<tel:(864)%20920-7129> CH2MHILL Extension 77540 [email protected]<mailto:[email protected]> From: Sprinklerforum [mailto:[email protected]<mailto:[email protected]>] On Behalf Of Mick Dugal Sent: Thursday, March 16, 2017 4:42 PM To: [email protected]<mailto:[email protected]> Subject: Concealed Combustible Spaces with Gyp Bd? [EXTERNAL] 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 -- Ron Greenman [email protected]<mailto:[email protected]> 253.576.9700<tel:(253)%20576-9700> The Universe is monstrously indifferent to the presence of man. -Werner Herzog, screenwriter, film director, author, actor and opera director (1942-) _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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