David, Interesting question. You haven't provided enough information for a thorough answer.
How big of an attic area? So you intend to mark the location of every upright sprinkler in the concealed space on the ceiling below? No one will ever paint that gypsum? Then cut access for NFPA 25 5-year internal pipe inspection? And cut access for NFPA 25 20-year sprinkler inspection? Life expectancy of a design/build NFPA 13 dry sprinkler system, riser mounted air compressor, schedule 10, black steel pipe = 7-15 years. Is that the system you are specifying? Or, are you specifying with nitrogen and schedule 40 pipe? Other? Why not fill with insulation? As long as you avoid mold issues (see webinar) that could be a better long-term option for your current client and whoever buys it next. NFPA 25 requires limited access for internal inspection, but if anything goes wrong (e.g. corrosion) how do you work on it without taking significant pieces of the ceiling down. Can you imagine how hard it is to locate pipe and problems in that space (i.e. Confined space) without accurate as-built drawings (I'm lucky if the owner has any drawings, but as-built for those spaces aren't the norm). We've taken off the roof of structures less than two years old to locate pipe and abandoned dry systems in attics because it is too expensive to take the ceilings down just to start locating the leaks and facilitate repairs. Too many questions for a simple answer. It'll be great to hear other responses. Scott Office: (763) 425-1001 x 2 Cell: (612) 759-5556 From: Sprinklerforum <sprinklerforum-boun...@lists.firesprinkler.org> On Behalf Of David Williams via Sprinklerforum Sent: Thursday, August 15, 2019 1:43 PM To: firstname.lastname@example.org Cc: David Williams <david.willi...@lhbcorp.com> Subject: Attic/Concealed space access to sprinkler heads I have a project intended to be fully sprinkled with a combustible attic that tapers from 2' to 4 ' without being filled to within 2 inches of the deck with insulation. So I am planning on a dry pipe system with standard heads as the design of the attic does not allow the effective use of special application attic sprinklers. The questions are: whether inspection access is required to be provided, is it prudent to do so at the heads, or can the locations just be noted on the gypsum mounted to the bottom chord of the open web trusses. TIA David T Williams, PE - Lead MEP/FP Engineer 21 West Superior Street, Suite 500, Duluth, MN 55802 Direct 218.279.2436 | Cell 218.310.2446 LHBcorp.com<http://www.LHBcorp.com> LHB, Inc. | PERFORMANCE DRIVEN DESIGN.
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