Insulation is considered ceiling A8.5.4.1 130 spacing Use 4.2 heads Reduce Remote Area Aka “What Travis said”
From: Sprinklerforum [mailto:[email protected]] On Behalf Of Ben Young Sent: Tuesday, November 22, 2016 11:23 AM To: [email protected] Subject: Re: Ceiling of trusses and insulation - Character set not allowed I agree that this is combustible construction with members three feet or less on center. Hmm, I think I see where part of my hesitation lies. I've been checking my 2013 edition instead of my 2010. The 2013 edition changed around table 8.6.2.2.1(a) and added 'Combustible unobstructed with no exposed members' at 225 SQFT for a hydraulically calculated system. I guess I'm latching onto the 'no exposed members' part, but even if you completely stuff TJI construction with insulation, its still obstructed construction, correct? I read the construction definition portions of chapter 3, and I don't see anything that would allow me to go to 225 SQFT here. So any way I try and slice it, I'm looking at 130 SQFT, with the deflectors 1-6 below the bottom of the TJIs up to a maximum distance down of 22 from the top of the structure. The insulation basically does nothing except get in my way and hold mold spores. Is that the way you guys are reading it? On Tue, Nov 22, 2016 at 8:54 AM Greg McGahan <[email protected]<mailto:[email protected]>> wrote: I agree with Travis. We have however been forced to have chicken wire or similar under the insulation to prevent it prematurely falling on the heads. Greg McGahan Living Water Fire Protection, LLC<http://www.livingwaterfp.com> 1160 McKenzie Road Cantonment, FL 32533 850-937-1850<tel:850-937-1850> fax 850-937-1852<tel:850-937-1852> On Mon, Nov 21, 2016 at 5:07 PM, Travis Mack, SET <[email protected]<mailto:[email protected]>> wrote: Then just do standard spray sprinklers at 130 sq ft max spacing. Reduce the design area to 900 sq ft. Use 4.2k sprinklers to keep the over-discharge down. I think you are correct in using the insulation for your ceiling to locate your deflectors. Travis Mack, SET MFP Design, LLC 2508 E Lodgepole Drive Gilbert, AZ 85298 480-505-9271<tel:480-505-9271> fax: 866-430-6107<tel:866-430-6107> email:[email protected]<mailto:email:[email protected]> http://www.mfpdesign.com https://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 4:01 PM, Ben Young wrote: 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]<mailto:[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 85298 480-505-9271<tel:480-505-9271> fax: 866-430-6107<tel:866-430-6107> email:[email protected]<mailto:email:[email protected]> http://www.mfpdesign.com https://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 list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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