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.
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Steve Leyton Sent: Thursday, January 16, 2014 3:45 PM To: [email protected] Subject: RE: Glass & room design It says, " ... rooms shall be enclosed with walls having a fire resistance rating equal to the water supply duration ..." If the wall is a rated assembly and the glazing is within the allowable gross area for unprotected openings, then I would assume that you can do it. Consult the building code for the allowable openings, glazed area, protected and unprotected, etc., etc. Steve L. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ed Kramer Sent: Thursday, January 16, 2014 1:42 PM To: [email protected] Subject: Glass & room design Reference NFPA 13 ('13) section 11.2.3.3.3. "To utilize the room design method, all rooms shall be enclosed with walls having a fire-resistance rating equal to the water supply duration indicated in Table 11.2.3.1.2." In light hazards, self-closing doors are exempt (they are allowed to be non-rated). What about a non-operable window in the wall between an office and a corridor - is it required to be 30 minute rated? Let's say the window is 6' wide x 4' tall with an 8" deep (or deeper) lintel above it. When calculating the office using the room design method, am I required to include 2 spirnks on the other side of the window? What if the window was full-height (no lintel above it), does that change anything? What if we change the window to a full-height glass wall? I'm trying to wrap my head around the role glass plays (or doesn't play) in applying the room design method. Ed Kramer Lawrence, KS _______________________________________________ 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
