James, I believe the following sections would apply (2013 ed):
8.15.1.2.14 Vertical pipe chases under 10 ft2, where provided in multifloor buildings where the chases are firestopped at each floor using materials equivalent to the floor construction, and where such pipe chases shall contain no sources of ignition, piping shall be water-filled or noncombustible and pipe penetrations at each floor shall be properly sealed and shall not require sprinkler protection. 11.2.3.1.4 Restrictions. When either the density/area method or room design method is used, the following shall apply: (4) The following unsprinklered concealed spaces shall not require a minimum area of sprinkler operation of 3000 ft2 (h) Vertical pipe chases under 10 ft2, provided that in multifloor buildings the chases are firestopped at each floor using materials equivalent to the floor construction, and where such pipe chases shall contain no sources of ignition, piping shall be noncombustible, and pipe penetrations at each floor shall be properly sealed. Thank you, Bob Knight, CET III 208-318-3057 From: Sprinklerforum [mailto:[email protected]] On Behalf Of James Litvak Sent: Monday, June 25, 2018 11:09 AM To: [email protected] Subject: Combustible Concealed Void Spaces **Sorry for the repeat send, first try had a typo in the subject** Often in wood construction there are void spaces caused by various situations, such as the shape of a bathroom around the bathtub, odd shaped dwelling units, etc. These spaces are inaccessible and have no insulation in them. Are sprinklers required in them, and why / why not? For context, we (me and coworkers) don't put sprinklers in those spaces because they don't have access. However, when questioned by an engineer, we are questioning the validity of using section 8.15.1.2.1 because we're not entirely sure if it's considered limited-combustible construction. Certainly the gypsum board on the studs is limited, but the wood studs themselves aren't. To help visualize, I've included a graphic. The areas in question are marked with asterisks. https://i.imgur.com/v1NIpYB.png
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