Sounds like he is applying section 404.6 exception 1 of the building code. In that section sprinklers are only required on the walkway side of the glass (where the fuel loading is). So, no calculation on the atrium side. For the office side, are you proposing to use the room design method? I'd be hesitant to do so. Do the walls have a 30 minute fire-resistive rating? If not, I would be looking for a full design area with the corresponding number of water curtain sprinklers per NFPA 13 2007, 11.3.3.2
Here's the Florida building code section (IBC). 404.6 Enclosure of atriums. Atrium spaces shall be separated from adjacent spaces by a 1-hour fire barrier constructed in accordance with Section 707 or a horizontal assembly constructed in accordance with Section 712, or both. Exceptions: 1. A glass wall forming a smoke partition where automatic sprinklers are spaced 6 feet (1829 mm) or less along both sides of the separation wall, or on the room side only if there is not a walkway on the atrium side, and between 4 inches and 12 inches (102 mm and 305 mm) away from the glass and designed so that the entire surface of the glass is wet upon activation of the sprinkler system without obstruction. The glass shall be installed in a gasketed frame so that the framing system deflects without breaking (loading) the glass before the sprinkler system operates. 2. A glass-block wall assembly in accordance with Section 2110 and having a 3/4-hour fire protection rating. 3. The adjacent spaces of any three floors of the atrium shall not be required to be separated from the atrium where such spaces are accounted for in the design of the smoke control system. Jack Fairchild -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of George Church Sent: Monday, December 19, 2011 12:49 PM To: [email protected] Subject: RE: Water curtains Without knowing what edition of 13 and what building code, I'd be calc'g one row of heads the length of your remote area at .3gpm/linear foot, adding it to the calc for the OH system. In the small rooms, pick up .3GPM/linear ft for the heads in that room. I think you were on the right track. I'm taking a different approach in one today, excluding it cause I'm in conceptual stage (25% dwgs) and can. George L. Church, Jr., CET Rowe Sprinkler Systems, Inc. PO Box 407, Middleburg, PA 17842 877-324-ROWE 570-837-6335 fax [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Greg McGahan Sent: Monday, December 19, 2011 12:26 PM To: [email protected] Subject: Water curtains We have an engineered design (by a registered PE) that has a glass atrium wall in a LEEDS building. I am assuming some of you guys have already dealt with this. He has called for SSP heads - not listed window sprinklers - on both sides of the wall. He is fuzzy in his logic for calculating them however and frankly so am I. One side is 3 floors of glass so it is one huge compartment, the other side is split into offices, so there are only 1-3 window sprinklers in each room. How do we calc the atrium on the big room side - as a water curtain balanced with the OH system? In the small rooms, do we just do a most demanding room calc and include the window sprinklers? Thanks for the help. Greg -- Greg McGahan Living Water Fire Protection, LLC <http://www.livingwaterfp.com> 1160 McKenzie Road Cantonment, FL 32533 850-937-1850 fax 850-937-1852 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20111219/63ce58f2/attachment.html> _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
