Travis, you're right on the CC spec app heads, for some crazy reason I was thinking 36" was the min not the max!
8.15.1.2.5 makes sense, but I look at 8.15.1.2.6 and it makes me think there's a reason they didn't include 'composite wood joist' in 1.2.5. Look at 1.2.8 and 1.2.13 where they use both terms. Basically I don't feel like 'wood joist' is a catchall term for section 8.15.1 But yeah, I would love to be proven wrong on this! Benjamin Young On Wed, Mar 28, 2018 at 12:19 PM, MFP Design, LLC <[email protected]> wrote: > *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.* > > > > > > > > [image: MFP_logo_F] > > Travis Mack, SET > > MFP Design, LLC > > 3356 E Vallejo Ct > > Gilbert, AZ 85298 > > 480-505-9271 <(480)%20505-9271> > > fax: 866-430-6107 <(866)%20430-6107> > > email:[email protected] > > > > http://www.mfpdesign.com > <https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.mfpdesign.com%2F&data=02%7C01%7C%7C1121d49f9e6b4cf248f108d4df580e77%7C14e5497c16da42e69ffa77d19bafe511%7C0%7C0%7C636379016677342180&sdata=HJ8OA4xyeHAoxXNz5mu%2FYfycgtd5nsFrrpvzulZiNkQ%3D&reserved=0> > > https://www.facebook.com/pages/MFP-Design-LLC/92218417692 > <https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.facebook.com%2Fpages%2FMFP-Design-LLC%2F92218417692&data=02%7C01%7C%7C1121d49f9e6b4cf248f108d4df580e77%7C14e5497c16da42e69ffa77d19bafe511%7C0%7C0%7C636379016677342180&sdata=H%2BwdcgK8DLGBcNoqJEvUrzsXngySwkX56Vgf9gM9EGk%3D&reserved=0> > > Send large files to us via: https://www.hightail.com/u/MFPDesign > <https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.hightail.com%2Fu%2FMFPDesign&data=02%7C01%7C%7C1121d49f9e6b4cf248f108d4df580e77%7C14e5497c16da42e69ffa77d19bafe511%7C0%7C0%7C636379016677342180&sdata=eGdMZGu2wXhUupGwgGTrqF3b54OP5%2BAZvlHhABSexWY%3D&reserved=0> > > LinkedIn: https://www.linkedin.com/in/travismack > <https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.linkedin.com%2Fin%2Ftravismack&data=02%7C01%7C%7C1121d49f9e6b4cf248f108d4df580e77%7C14e5497c16da42e69ffa77d19bafe511%7C0%7C0%7C636379016677342180&sdata=tT5E7LsZjSmyreKi4gDCa70EWN%2BZodi%2FhbeCbHNRijI%3D&reserved=0> > > > > *“**The bitterness of poor quality remains long after the sweetness of > low price is forgotten.**”* > > > > *From:* Sprinklerforum <[email protected]> *On > Behalf Of *Mike Hairfield > *Sent:* Wednesday, March 28, 2018 9:13 AM > *To:* [email protected] > *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 <[email protected]> > on behalf of Ben Young <[email protected]> > *Sent:* Wednesday, March 28, 2018 12:06 PM > *To:* [email protected] > *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 > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler. > org > >
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