I’m thinking that “perpendicular” in the code you referenced is intended to mean perpendicular in plan view, not perpendicular in an elevation (or 3-dimensionally). Like where the walls don’t form 90-degree angles in plan view.
In fact, I would say that the preceding section stating that distance between sprinklers shall be measured along the slope is a pretty good indicator that the intention of the code would be to measure along the slope for spacing. Why would the distance off of the wall be allowed to be extended slightly, but not the distance between heads? But if that’s the case, then can the sprinkler be closer than the minimum distance to the wall (in plan view, i.e. horizontally) as long as it is at least the minimum distance away when measure along the slope? Hmm… Maybe I have to rethink this. I like the idea of just spacing horizontally to walls for slopes less than 2 in 12, and would assume that to be sufficient from a practical application standpoint. -Kyle M From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On Behalf Of Mike B Morey Sent: Monday, March 4, 2019 8:25 AM To: sprinklerforum@lists.firesprinkler.org Subject: [EXTERNAL] Re: When to Measuring Along the Slope In this particular case though, one head measuring to walls, wouldn't the wording of 8.5.3.2 (2016 edition) preclude the need to measure on the slope? Perpendicular to the wall to me is along the floor. The section before relating to distance between sprinklers does call out along the slope very clearly, but the distance to walls section does not. ________________________________ Mike Morey CFPS 3229 • NICET S.E.T. 123677 Project Manager • Fire Protection Group Shambaugh & Son, LP an EMCOR Company 7614 Opportunity Drive • Fort Wayne, IN • 46825 direct 260.487.7824 / cell 260.417.0625 / fax 260.487.7991 email mmo...@shambaugh.com<mailto:mmo...@shambaugh.com> [cid:image001.jpg@01D4D26F.6FB47FD0] From: Roland Huggins <rhugg...@firesprinkler.org<mailto:rhugg...@firesprinkler.org>> To: sprinklerforum@lists.firesprinkler.org<mailto:sprinklerforum@lists.firesprinkler.org> Date: 03/04/2019 10:19 AM Subject: Re: When to Measuring Along the Slope Sent by: "Sprinklerforum" <sprinklerforum-boun...@lists.firesprinkler.org<mailto:sprinklerforum-boun...@lists.firesprinkler.org>> ________________________________ BE ADVISED - This email originated outside EMCOR. Hydraulic calculations uses the distance along the floor. Spacing is along the slope. You can be perpendicular to the wall and still be going up a slope. The issue of horizontal (up to 2/12) is defined to address design criteria that is limited to horizontal ceilings (storage and when to increase the remote area for occupancy hazard approach). The REALITY is that the 15 ft 1 in is irrelevant in regards to actual performance BUT it’s a deficiency in our methodology. I suspect it would go unnoticed in 99% of submittals. I also ENCOURAGE you to submittal a public input saying its ok to measure all the floor in spacing sprinklers for slopes up to 2/12. Roland Roland Huggins, PE - Senior VP Engineering American Fire Sprinkler Assn. Dallas, TX http://www.firesprinkler.org<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.firesprinkler.org_&d=DwMFaQ&c=GKdB6-XpYq_0W-WluyVHtw&r=z4t2hrRBa-JsS06T4X_uuYOSJoclVWgSRO8Nq6TDdsg&m=puiC-5IXgQVa5G5cN4roPVkPtmJplxelXACPl19h08U&s=GKmuDGyeH2NVhdPBqFYhcEGmcURYO4DtJCCrp0org5s&e=> Fire Sprinklers Saves Lives On Mar 1, 2019, at 10:15 AM, jvankol...@mfpc.us<mailto:jvankol...@mfpc.us> wrote: Our Design team was having a discussion on a situation. We have a room open to the roof deck that slope less then 2/12. The room measure 15’-0” in one direction. Without using an small room rule, is it still acceptable to install a single standard spray sprinkler in the center of the 15’-0” direction? Thoughts? Jerry Van Kolken Millennium Fire Protection Corp. 2950 San Luis Rey Rd. 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