Granted as pointed out that everything else must also be non- or limited-combustible but it's a moot point since it is WOOD JOIST construction. Focusing on the outer membrane doesn't change the fact that the assembly is combustible construction.
Roland Roland Huggins, PE - VP Engineering American Fire Sprinkler Assn. --- Fire Sprinklers Saves Lives Dallas, TX http://www.firesprinkler.org On Aug 5, 2013, at 7:26 AM, Brian Harris <[email protected]> wrote: > All- > I recently finished a design for a wood structure day care facility, (1) > level of attic heads and (1) level of ceiling heads. The GC has now decided > in an effort to save money on the HVAC to attach drywall to the bottom of the > wood joist and use the area between this drywall and the suspended ceiling as > a return air plenum. If I'm reading 8.1.1.2.1 & 8.15.1.2.2 correctly I do not > need to add a 3rd level of protection in this "plenum" area correct? > > Brian Harris, CET _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
