Travis, I actually don't want to use CC heads because of the onerous draft stopping requirements, so that's a negative. Space is heated, so we're talking wet system here.
Benjamin Young On Mon, Nov 21, 2016 at 3:10 PM, Travis Mack, SET <[email protected]> wrote: > I would say you have combustible framing members less than 3' on center so > you are limited to 130 sq ft spacing. If the space is less than 60" deep, > you may want to consider something like the Tyco CC3 and get up to 16' > spacing at 256 sq ft. Also, the design area would be reduced. You would > have 1950 sq ft with SSU, assuming this is dry, or 1300 sq ft with CC3, > again, assuming it is dry. > > Travis Mack, SET > MFP Design, LLC > 2508 E Lodgepole Drive > Gilbert, AZ 85298480-505-9271 > fax: 866-430-6107email:[email protected] > http://www.mfpdesign.comhttps://www.facebook.com/pages/MFP-Design-LLC/92218417692 > Send large files to us via: https://www.hightail.com/u/MFPDesign > LinkedIn: https://www.linkedin.com/in/travismack > > On 11/21/2016 12:56 PM, Ben Young wrote: > > So I have a crawl space that was originally supposed to get drywall on the > underside of the trusses, but now the owner wants sprinklers instead. > > This is inside an apartment building of type VB construction under the > ground floor. The crawl space is more than 36" deep, so it doesn't require > CC heads. > > My question is how the heck do I treat the spacing for the heads I'm going > to install? > > The structure is 14" deep TJIs that are stuffed with non-faced batt > insulation that's held in place by furring strips. My gut is telling me > its not a smooth flat ceiling, but its also not exactly combustible > obstructed either. > > At this point, I don't even know whether I should consider it obstructed > or unobstructed. > > > I'm leaning towards the insulation will act as a ceiling and I can go 1-12 > down from the bottom of the truss, and do 225 SQFT spacing, but can't find > anything to assuage my fears in the code. > > This project was submitted under the 2010 edition of 13, but the AHJ now > has adopted 2013, FYI. > > I looked through 8.15.1 but that doesn't really tell me HOW to space in > these areas, just if I can omit or not... also didn't find too much of use > in the AFSA informal interps. > > Any thoughts on this? > > Benjamin Young > > > _______________________________________________ > Sprinklerforum mailing > [email protected]http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler. > org > >
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