Matt, Yes, that is basically it. Wood trusses, so bottom of trusses (ceiling) has the batt insulation, paper up. We want to blow full of non-combustible insulation and not remove the paper-backed stuff. It is a very large area, two accesses only, and a laborer would have to crawl through and remove it all. Well, even to blow it full additional access locations would be necessary, but not as many as if that all has to come out.
Scott Office: (763) 425-1001 x 2 Cell: (612) 759-5556 -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Matt Grise Sent: Tuesday, June 30, 2015 7:52 AM To: [email protected] Subject: RE: Insulation and combustible concealed ceiling space Am I picturing this correctly? A lower level of wood 2x's with bat insulation directly on them (paper up), then laid on top of the paper (up to the top of the space) is blown-in insulation? If the paper is fully contained inside non-combustible insulation. 1 - It seems unlikely that the paper could catch on fire or propagate fire across it. 2 - this seems like the same idea that lets you exclude the rest of the combustibles (if the combustible surfaces are completely covered - then there are no exposed combustibles) You could call it 2 separate combustible concealed spaces - one space below the paper, one space above the paper. Both spaces are completely filled with non-combustible insulation. Matt Grisé PE*, LEED AP, NICET II Sales Engineer Alliance Fire Protection 130 w 9th Ave. North Kansas City, MO 64116 *Licensed in KS & MO 913.888.0647 ph 913.888.0618 f 913.526.7443 cell www. AFPsprink.com -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Scott A Futrell Sent: Tuesday, June 30, 2015 7:34 AM To: [email protected] Subject: Insulation and combustible concealed ceiling space Has anyone ever had an issue with a combustible concealed space that has one layer of kraft-faced batt insulation laying on the ceiling (kraft side up toward the sky) and then the remainder filled full of blown-in, non-combustible insulation and an AHJ saying the kraft-faced insulation had to be removed? Or, conversely that the kraft-faced was acceptable. This is fiberglass batt insulation, standard thickness for joists/studs with kraft backing. I’d really like to hear arguments for 1) having to remove the kraft-faced and why, and 2) leaving it in place and why. I want to leave it in place. Thanks! Scott Futrell _______________________________________________ Sprinklerforum mailing list [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 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
