I think 8.15.1.2.5 is going to be your best bet. The issue is that in many other places of the standard, composite wood joist are specifically handled differently than wood joist and are not considered "similar solid member construction."
As far as the specially listed sprinklers, I think you would have to use them with 8.15.1.6. This says less than 36", which I take as from zero to 36" in depth. The specially listed sprinklers have a requirement of 6" minimum clear space. This gets you back to there is no sprinkler that is available to protect this space. I would lean back to 8.15.1.2.5 and keep sprinklers out of the space. But, you will need to increase the design area to 3000 sq ft for adjacent spaces. Travis Mack, SET MFP Design, LLC 3356 E Vallejo Ct Gilbert, AZ 85298 480-505-9271 fax: 866-430-6107 <mailto:email:tm...@mfpdesign.com> email:tm...@mfpdesign.com <https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.mfpdesi gn.com%2F&data=02%7C01%7C%7C1121d49f9e6b4cf248f108d4df580e77%7C14e5497c16da4 2e69ffa77d19bafe511%7C0%7C0%7C636379016677342180&sdata=HJ8OA4xyeHAoxXNz5mu%2 FYfycgtd5nsFrrpvzulZiNkQ%3D&reserved=0> http://www.mfpdesign.com <https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.facebo ok.com%2Fpages%2FMFP-Design-LLC%2F92218417692&data=02%7C01%7C%7C1121d49f9e6b 4cf248f108d4df580e77%7C14e5497c16da42e69ffa77d19bafe511%7C0%7C0%7C6363790166 77342180&sdata=H%2BwdcgK8DLGBcNoqJEvUrzsXngySwkX56Vgf9gM9EGk%3D&reserved=0> https://www.facebook.com/pages/MFP-Design-LLC/92218417692 Send large files to us via: <https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.highta il.com%2Fu%2FMFPDesign&data=02%7C01%7C%7C1121d49f9e6b4cf248f108d4df580e77%7C 14e5497c16da42e69ffa77d19bafe511%7C0%7C0%7C636379016677342180&sdata=eGdMZGu2 wXhUupGwgGTrqF3b54OP5%2BAZvlHhABSexWY%3D&reserved=0> https://www.hightail.com/u/MFPDesign LinkedIn: <https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.linked in.com%2Fin%2Ftravismack&data=02%7C01%7C%7C1121d49f9e6b4cf248f108d4df580e77% 7C14e5497c16da42e69ffa77d19bafe511%7C0%7C0%7C636379016677342180&sdata=tT5E7L sZjSmyreKi4gDCa70EWN%2BZodi%2FhbeCbHNRijI%3D&reserved=0> https://www.linkedin.com/in/travismack "The bitterness of poor quality remains long after the sweetness of low price is forgotten." From: Sprinklerforum <sprinklerforum-boun...@lists.firesprinkler.org> On Behalf Of Mike Hairfield Sent: Wednesday, March 28, 2018 9:13 AM To: sprinklerforum@lists.firesprinkler.org Subject: Re: concealed space less than 6" deep I was at a AFSA NFPA 13 2013 ed seminar that was given by the AFA Virginia Chapter that the Great Bob Caputo was the instructor and this came up. If I remember correctly he stated that sprinklers are not required, but maybe it was during one of the times that doze off. Mike _____ From: Sprinklerforum <sprinklerforum-boun...@lists.firesprinkler.org <mailto:sprinklerforum-boun...@lists.firesprinkler.org> > on behalf of Ben Young <derblitzkrie...@gmail.com <mailto:derblitzkrie...@gmail.com> > Sent: Wednesday, March 28, 2018 12:06 PM To: sprinklerforum@lists.firesprinkler.org <mailto:sprinklerforum@lists.firesprinkler.org> Subject: concealed space less than 6" deep I feel like this has come up here before, but nothing came back when I did searches through the archives. I've got a concealed space that needs sprinklers, but I don't know how I'm going to put them in. (Light hazard office space under 2013 ED of 13) Wood TJI construction with an ACT suspended ceiling below it. >From top of joist to face of ceiling is only 16.5" deep TJIs are 12" deep How the heck do I protect this space with only a 4.5" gap that will be even smaller with the grid? Owner refuses to fill space with insulation inside trusses (for the time being) CC spec app heads not required since the space is so small anyway, but I think that also means I can't use CPVC, which would make hanging the pipe parallel to the trusses a lot easier. Its obstructed construction, so I should be able to put pendent heads below the bottom edge of the TJIs, but it will be no more than 2-3 inches above the ceiling. I don't even know if that will work so worst case is I need heads inside every truss space, right? The salesperson is telling me to use some weird combination of 8.15.1.2.3 (which I believe only applied to double trusses ) and 8.15.1.2.5 (which only applies to solid member construction and then you have 8.15.1.2.6 directly below it calling out TJIs) This definitely feels like a catch-22. Thanks, Benjamin Young
_______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
