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 Fax - 864.920.7129 CH2MHILL Extension 77540 [email protected] From: Sprinklerforum [mailto:[email protected]] On Behalf Of Mick Dugal Sent: Thursday, March 16, 2017 4:42 PM To: [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.
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