the number of layers is for a single membrane (aka one side of the studs).
Although logic could lead one to say having an non-rated door is no different than a non-rated window, 13 specific allows the door. There's a significant difference, though, between glass and wood and how they react to fire (and thermal shock when the sprinkler goes off). 11.2.3.3.5(2) explicits tells us how to address unprotected openings. Full steam ahead. Roland Roland Huggins, PE - VP Engineering American Fire Sprinkler Assn. --- Fire Sprinklers Saves Lives Dallas, TX http://www.firesprinkler.org On Jan 16, 2014, at 2:01 PM, Ed Kramer <[email protected]> wrote: > In this particular case (and is often the case) the wall is not a rated > assembly. But that's OK, because 11.2.3.3.3 doesn't require it to be a > rated assembly, just to have a 30 minute fire-resistance rating (light > hazard). This wall has 5/8" type X gyp on both sides. Per the National > Gypsum website, 2 layers of 5/8 type X (1 on each side) give a > fire-resistance rating of 1 hour. _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
