FWIW this was changed from 2019 to 2022, it previously stated “enclosed with walls” interior was added in 2022 with the justification that the intent was not to require exterior walls to be rated and carried without dissent or comment. Ref: FR 1230-NFPA 13-2019.
Mike Morey CFPS 3229 • NICET S.E.T. 123677 Project Estimator • Fire Protection Group Shambaugh & Son, LP an EMCOR Company 7614 Opportunity Drive • Fort Wayne, IN • 46825 direct 260.487.7824 / cell 260.417.0625 email [email protected]<mailto:[email protected]> 24/7<outlook-data-detector://2/> SERVICE LINE 888.217.7055<tel:888.217.7055> [cid:[email protected]] From: Jeff Brickell <[email protected]> Sent: Friday, January 24, 2025 2:55 PM To: [email protected] Subject: [Sprinklerforum] Room Design Method Good afternoon. I have an apartment project that has a small room that contains a diesel-powered generator. The room is on the corner of the building on level 1 and contains two interior walls, and two exterior walls. The two interior walls ZjQcmQRYFpfptBannerStart This Message Is From an Untrusted Sender You have not previously corresponded with this sender. ZjQcmQRYFpfptBannerEnd Good afternoon. I have an apartment project that has a small room that contains a diesel-powered generator. The room is on the corner of the building on level 1 and contains two interior walls, and two exterior walls. The two interior walls are rated 2-HR, as well as the ceiling, however, the two exterior walls are rated 1-HR. The room only has one door that opens to the exterior. I asked the architect to upgrade the two exterior walls to a minimum of 90 minutes to meet the water supply duration requirements of EH2 (it is a monitored system) so that I could use the Room Design Method. He is pushing back and asked why I wanted him to do that. As most of you know, The Room Design method requires “The enclosing interior walls of such a room must provide a fire resistance rating equal to the water supply duration requirements of Table 19.2.3.1.2<https://urldefense.com/v3/__https:/link.nfpa.org/publications/13/2025/chapters/19*ID000130002953__;Iw!!FaxH778!fVK3OkoiQ8wAG01O6JM74bvFC524lSCGK3wteU2rqB_0-9rSlLDc3ywpfLl5XkjQigXptxWl2KYQQ5Y$>”. His argument to not upgrade the fire rating of the exterior walls is that the code says ‘interior walls’, and not all walls, or exterior walls. I’m explaining to him that the walls are interior to the room itself, but he is not hearing me. Is there any other definitions or areas of NFPA I can cite that would make him understand what I and the code is saying? Am I misreading it? I have not applied the Room Design Method yet, but it seems cut and dry unless I’m missing something. Any advice helps! Thank you. Jeff Brickell, CET Senior Estimator/Designer NICET III CERTIFIED CERT #147245 OREGON CERTIFIED COBID FIRM #13272 (EMERGING SMALL BUSINESS) TRIAD FIRE PROTECTION [cid:[email protected]] OREGON . WASHINGTON . ARIZONA OFFICE 503.856.6333 CELL 602.550.4292 FAX 866.766.8862 This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and all copies of it from your system, destroy any hard copies of it and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient.
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