My understanding of the standard is no additional protection is needed as long as you have the 18" of clearance between the sprinkler and the top of the obstruction. As you stated, the pattern is developed sufficiently to allow adequate protection since water will be delivered on both sides of the obstructions.
*The above is my opinion and has not been processed as a formal interpretation in accordance with the NFPA Regulations Governing Committee Projects. This is provided with the understanding that the AFSA assumes no liability for this opinion or actions taken on it and they are not to be considered the official position of the AFSA, NFPA or NFPA's technical committees. AFSA cannot provide design or consulting engineering services, and this opinion should therefore not be considered, nor relied upon, as such.* Thanks, John John August Denhardt, PE *Vice President, Engineering and Technical Services* *American Fire Sprinkler Association* m: p: 301-343-1457 214-349-5965 ext 121 w: firesprinkler.org <https://www.facebook.com/firesprinkler.org/> <https://twitter.com/afsa/status/1039528345367732224> <https://www.linkedin.com/company/american-fire-sprinkler-association-afsa-/> <https://www.instagram.com/firesprinklerorg/> *Our members are at the heart of everything we do* *Be a Member, Get a Member* We’re introducing many new programs to help meet your team’s business needs. AFSA is offering a six-month trial membership for contractors and a 12-month trial membership for municipal AHJs. Let’s help potential members see what they’re missing! Current members who recruit a new contractor member will receive a $100 gift card and the new member gets a free webinar. Let’s grow stronger together! Join AFSA <http://www.firesprinkler.org/join>. On Mon, Feb 15, 2021 at 10:12 AM Dane Long via Sprinklerforum < [email protected]> wrote: > I don’t think these classify as a cloud ceiling as their 4ft by 8ft tectum > ceiling panels suspended below the desk. Per A8.6.5.3.3 Ceiling panels with > the width 4ft or less and the length 4ft or more and more than 18" down do > not require protection. NFPA 13 doesn’t specify a max or min. spacing > between ceiling panels. These panels are spaced minimum 6" between and > sloped in two directions (See Attached for some snips). > > Thanks, > > Dane Long, AET > Engineering Technician | Bamford Fire Sprinkler Co., Inc. > P: 785.825.7710 > F: 785.825.0667 > A: 1383 W. North Street Salina, KS 67401 > > > > -----Original Message----- > From: Sprinklerforum <[email protected]> On > Behalf of Skyler Bilbo via Sprinklerforum > Sent: Friday, February 12, 2021 5:36 PM > To: [email protected] > Cc: Skyler Bilbo <[email protected]> > Subject: Re: [EXTERNAL] Noncontinuous obstructions More than 18" down > > It sounds like the architect is working hard to inspire kids with his > beautiful ceiling design... From the little information you gave, it may > be more like a cloud ceiling than a traditional obstruction. See section > 3.3.5.1 for the definition, and then 8.15.1.2.1.3 for criteria. You may > also want to check out the research that "inspired" the cloud ceiling > criteria at the link below, it is really great information. > > > https://www.nfpa.org/News-and-Research/Fire-statistics-and-reports/Research-reports/Suppression/Sprinkler-Protection-for-Cloud-Ceilings > > > Skyler Bilbo > > On Fri, Feb 12, 2021 at 3:41 PM Kyle.Montgomery via Sprinklerforum < > [email protected]> wrote: > > > Does "at least 1 inch of space between each panel" mean several feet > > of space between each panel, or does it mean just a couple of inches. > > > > To me, it sounds more like you would have to treat them as grouped > > obstructions and protect underneath. > > > > -Kyle M > > > > -----Original Message----- > > From: Sprinklerforum <[email protected]> > > On Behalf Of Dane Long via Sprinklerforum > > Sent: Friday, February 12, 2021 2:29 PM > > To: [email protected] > > Cc: Dane Long <[email protected]> > > Subject: [EXTERNAL] Noncontinuous obstructions More than 18" down > > > > Seeking others opinions.... > > > > I'm doing an Elementary school where in the commons area they have > > 4ft. by 8ft. tectum ceiling panels space throughout with at least 1" > > of space between each panel. These panels are slopes with the roof in > > one direct and then away from the roof in another. A8.6.5.3.3 Per NFPA > > 13 (2016) > > > > "A.8.6.5.3.3 When obstructions are located more than 18 in. (450 mm) > > below the sprinkler deflector, an adequate spray pattern develops and > > obstructions up to and including 4 ft (1.2 m) wide do not require > > additional protection underneath. Examples are ducts, decks, open > > grate flooring, catwalks, cutting tables, overhead doors, soffits, > > ceiling panels, and other similar obstructions. The width of an object > > is the lesser of the two horizontal dimensions (with the length being > > the longer horizontal dimension). Sprinkler protection is not required > > under objects where the length is greater than 4 ft (1.2 m) and the > > width is 4 ft (1.2 m) or less." > > > > Doesn’t seem to me like I need protection below these panels. > > > > *Send me a private email if you'd like to look at the pdf. > > > > Thanks, > > > > Dane Long, AET > > Engineering Technician | Bamford Fire Sprinkler Co., Inc. > > P: 785.825.7710 > > F: 785.825.0667 > > A: 1383 W. North Street Salina, KS 67401 > > > > > > > > -----Original Message----- > > From: Sprinklerforum <[email protected]> > > On Behalf Of Ron Greenman via Sprinklerforum > > Sent: Friday, February 12, 2021 2:35 PM > > To: [email protected] > > Cc: Ron Greenman <[email protected]> > > Subject: Re: Multiple System Calculation > > > > This sounds like a job for more sheetrock. Oh, and more cowbell is > > always good. > > > > On Fri, Feb 12, 2021 at 10:57 AM Sean Conlin via Sprinklerforum < > > [email protected]> wrote: > > > > > See NFPA-13, 23.4.4.1.1.4 and 23.4.4.1.1.5. > > > > > > > > > > > > This should help you with the engineer. > > > > > > > > > Regards, > > > > > > Sean W. Conlin, A.Sc.T. > > > Director > > > Demand Sprinkler Design Inc. > > > 37 Summerfield Crescent > > > Brampton, ON L6X 4K4 > > > T: 905-216-0922 > > > C: 416-317-0028 > > > E: [email protected] > > > > > > This message, including any attachments is considered confidential > > > and for use only by the intended recipient(s). > > > Any other distribution, copying or disclosure is strictly prohibited. > > > Please delete this communication and notify Demand Sprinkler Design > > > Inc. if you are not the intended recipient or have received this > > > message in error. Demand Sprinkler Design Inc. accepts no > > > responsibility or liability for any loss or damage from use, > > > including damage from viruses. > > > > > > > > > > > > -----Original Message----- > > > From: Joe Burtell <[email protected]> > > > Sent: February 11, 2021 1:47 PM > > > To: [email protected] > > > Subject: Multiple System Calculation > > > > > > > > > > > > I have a situation where an engineer is telling me I have to > > > calculate a wet and dry system together because neither space meets > > > the 1500 s.f minimum. I have a penthouse mechanical room OH 1 (WET) of > 1014 s.f. > > > and an adjacent room OH1 (DRY) of 469 s.f. I have calculated each > > > room separate of each other. There is a full-height wall with a door > > > that separates the rooms. The wall and door are not fire rated, so > > > the large room method is out. This does not make any sense to me. > > > Any sections that would require this to be done. He is saying 11.1.2 > > > of NFPA 13 2016 requires it. I argue exception #2 says it does not > apply. > > > > > > > > > > > > Best regards, > > > > > > > > > > > > *Joe Burtell, SET, CFPS* > > > > > > > > > > > > [image: Burtell Fire_Small] > > > > > > > > > > > > Phone | Fax | Mobile| Text *406-204-4653 <++1-406-204-4653>* > > > > > > > > > > > > 116 N. 11th Street | Billings, MT 59101 > > > > > > > > > > > > Email: [email protected]<mailto:[email protected]> > > > > > > > > > > > > Web Site: > > > https://urldefense.proofpoint.com/v2/url?u=http-3A__www.burtellfire. > > > co > > > m&d=DwIGaQ&c=wn3mZQLIuInh2ClcJ0_DIA&r=Z_2A85VL7AQzoqudh6uOyS3bn8etxB > > > 7n > > > LN8OBJwQd9A&m=YiHEM_F8z0hFdXcjHH1CqWJ0eIkSBYspd-WeDgZrxAI&s=Ur5xExeU > > > b- o3ipcDAOmkBHLKgAtIDEQsMndg_0EjUcg&e= > > > > > > > > > > > > *“**The bitterness of poor quality remains long after the sweetness > > > of low price is forgotten.**”* > > > > > > > > > > > > *NOTICE:* The information contained in this e-mail transmission is > > > intended only for use of the individual or entity named above. 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