Sorry but I see no sprinkler correlation whatsoever with regard to NFPA 72 heat detector spacing. Detectors have an entirely different set of spacing and placement rules apart from sprinklers. Heat detection devices mentioned within the NFPA 13/15 Standards are more often referring to dry or wet pilot sprinklers used to trigger other systems such as deluge or preaction systems. But while those are actual sprinklers, even those have different spacing and location rules than spray sprinklers. So, stay within the NFPA 13 spacing rules for spray sprinklers.
My first step would be getting input from a structural engineer as was stated previously. These types of structures may not necessarily have been designed to sustain the point load of a water filled sprinkler system and may require special hanging measures to distribute the loads across multiple wood members. I also hope you don't have to contend with seismic bracing but if you do, that also should be guided by a structural engineer so you know how and where to attach to the structure. Then I'd look at Wood Joist construction and see how that fits with the actual construction of the assembly. Also take a look at other resources such as FM Global Data Sheets or XL GAPS protection data. Sometimes when dealing with wonky construction such as this, the insurers have more relevant data than NFPA. Craig Prahl | Jacobs | Group Lead – Fire Protection | 864.676.5252 | [email protected] | www.jacobs.com -----Original Message----- From: Sprinklerforum <[email protected]> On Behalf Of Steve Leyton Sent: Tuesday, July 24, 2018 7:17 PM To: [email protected] Subject: [EXTERNAL] RE: Lamella Roof So ... you're suggesting that sprinklers be ... spaced as detectors? What's the "deflector" distance of a heat detector and how would that translate to sprinklers on branch piping exactly? What the hell are you even talking about? I get that sense Brad that, at this point, you're just posting for the sake of seeing your words in print because that's the 2nd-most ridiculous thing (after the Ghost Ship comment) you've ever put up. Please, just stop. Sharon - since it's framed of wood, I'd look at the criteria for depth and on-center the spacing of the members. It's likely to end up being (or closest) to Wood Joist Construction per A.3.7.1 (6) and that section even includes criteria on the span. The honeycomb elements will catch head just as solid wood or composite joist members will; the honeycomb pockets look (in photos, I had to Google "Lamella Roof") like the area and volume would be less than a TJI channel typically is, so heat and combustion byproduct will log down to the sprinklers pretty quickly. An unusual configuration by today's standards but I'm not sure it has to be that complicated for sprinkler locations. Steve L. -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of [email protected] Sent: Tuesday, July 24, 2018 3:53 PM To: [email protected] Subject: Re: Lamella Roof All I've got Sharon is to look at NFPA 72 spacing and position rules for heat detectors for dome roofs, since the first responsibility of a sprinkler is to be a heat detector, and 13 does not adress dome roofs. Brad Quoting Sharon Alves <[email protected]>: > So, nothing extraordinary? I’m thinking wood joist criteria? I don’t > know yet how deep the wood is, but I’m thinking it is 12” deep. > >> On Jul 24, 2018, at 3:16 PM, Timothy Goins <[email protected]> wrote: >> >> Years ago in Weslaco, Texas. We called them honeycomb roofs. They are >> great and very sturdy and open, good for warehouses. First came here >> during and after the great wars via a German engineer. >> >> And I will give them one heart, and I will put a new spirit within >> you; and I will take the stony heart out of their flesh, and will >> give them an heart of flesh Eze 11:19 >> >>> On Jul 24, 2018, at 4:58 PM, Sharon Alves >>> <[email protected]> wrote: >>> >>> I have been asked to provide a design for a gymnasium retrofit. >>> The gymnasium has a lamella roof system. I have never seen this >>> before. >>> >>> I was wondering if anyone in the forum has had experience with a >>> lamella roof. >>> >>> -- >>> Sharon Alves >>> [email protected] >>> 530-205-7678 >>> _______________________________________________ >>> Sprinklerforum mailing list >>> [email protected] >>> https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.firesprink >>> ler.org_listinfo.cgi_sprinklerforum-2Dfiresprinkler.org&d=DwIGaQ&c=O >>> gZOSER8c1RLeytEexU279Q2qk0jVwkrOdYe5iSi-kk&r=6qYbbLx8x0UrMujmEGNoh-2 >>> hzoFD2d1EB5d2sQF0_OI&m=chlTsuniybFHV-oBpCf0tEpdMMVNrmxA_eAKxzNEJuk&s >>> =rfEPOq0SKbKG2mlRtto8oeSVZ-zZbqEcGmvO2jji2Is&e= >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.firesprinkl >> er.org_listinfo.cgi_sprinklerforum-2Dfiresprinkler.org&d=DwIGaQ&c=OgZ >> OSER8c1RLeytEexU279Q2qk0jVwkrOdYe5iSi-kk&r=6qYbbLx8x0UrMujmEGNoh-2hzo >> FD2d1EB5d2sQF0_OI&m=chlTsuniybFHV-oBpCf0tEpdMMVNrmxA_eAKxzNEJuk&s=rfE >> POq0SKbKG2mlRtto8oeSVZ-zZbqEcGmvO2jji2Is&e= _______________________________________________ Sprinklerforum mailing list [email protected] https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.firesprinkler.org_listinfo.cgi_sprinklerforum-2Dfiresprinkler.org&d=DwIGaQ&c=OgZOSER8c1RLeytEexU279Q2qk0jVwkrOdYe5iSi-kk&r=6qYbbLx8x0UrMujmEGNoh-2hzoFD2d1EB5d2sQF0_OI&m=chlTsuniybFHV-oBpCf0tEpdMMVNrmxA_eAKxzNEJuk&s=rfEPOq0SKbKG2mlRtto8oeSVZ-zZbqEcGmvO2jji2Is&e= _______________________________________________ Sprinklerforum mailing list [email protected] https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.firesprinkler.org_listinfo.cgi_sprinklerforum-2Dfiresprinkler.org&d=DwIGaQ&c=OgZOSER8c1RLeytEexU279Q2qk0jVwkrOdYe5iSi-kk&r=6qYbbLx8x0UrMujmEGNoh-2hzoFD2d1EB5d2sQF0_OI&m=chlTsuniybFHV-oBpCf0tEpdMMVNrmxA_eAKxzNEJuk&s=rfEPOq0SKbKG2mlRtto8oeSVZ-zZbqEcGmvO2jji2Is&e= ________________________________________________________________________________________ NOTICE - This communication may contain confidential and privileged information that is for the sole use of the intended recipient. Any viewing, copying or distribution of, or reliance on this message by unintended recipients is strictly prohibited. If you have received this message in error, please notify us immediately by replying to the message and deleting it from your computer. _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
