Rod, I experienced this exact situation. In order to blow it in the drywall has to be in place on the underside with installation holes bored in the decking above. The holes (typically 2") have to be properly placed and spaced and are left open after installation for inspection where a stick is used to determine if there are any voids. Where a void exists the stick will cause the insulation level to drop requiring it to be topped off. It's a ton of work to avoid putting sprinklers in a qualified concealed space.
PS, If they ever ever open the ceiling, oh boy, like an hour glass it pours out requiring reinstallation of semi rigid insulation such as roxul or thermafiber. I have pics if you want to see, off list. John Drucker, CET Assistant Construction Official Fire Protection Subcode Official Building/Fire/Electrical Inspector Borough of Red Bank Red Bank, New Jersey Email: [email protected] Cell/Text: 732-904-6823 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Rod DiBona Sent: Monday, March 24, 2014 4:59 PM To: [email protected] Subject: truss filled with insulation I have an apartment building where the architect took the area increases for a full 13 system. They are utilizing a 16"open web truss in between the floors. The mechanical is running hvac in the truss. The sections show the space filled with insulation with an accompanying note that states that it will be. My question is how is this "completely filled with non - combustible insulation?" They are planning on blowing in the insulation around all the duct etc that is in the space but it just seems really hard to believe that it will indeed be completely filled. I remember a while back Roland tried to get a 2" gap on the top and I think that was a battle. I am picturing the duct blocking insulation from getting in plenty of spots. Maybe not? Any thougts? Rod at Rapid _______________________________________________ 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
