Now I understand the need for gypsum or some other non-com ceiling. As long as the joints are tight, just butted together, I don't see the need for tape. It's really a matter of opinion as there is nothing in code to point at for what constitutes a ceiling or the enclosure of combustible construction. True in a house the garage wall is required to be taped but I think this is performance wise MAYBE a higher standard. If this were ACT within 6" you'd also not be required to sprinkler. ACT has to "leak" more than tight butted gypsum. (geeh "tight butted gypsum" I think I hear some ribbing coming here)
I'd also ask why even rock? You'll be running the pendant branch line piping through the space right? Wouldn't brass uprights on sprigs if necessary to 15" below the floor be cheaper? And IMHO sprinklers are better protection than gypsum. Chris Cahill, P.E. Fire Protection Engineer Sentry Fire Protection, Inc. 763-658-4483 763-658-4921 fax Email: [email protected] Mail: P.O. Box 69 Waverly, MN 55390 Location: 4439 Hwy 12 SW Waverly, MN 55390 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Russell Sent: Thursday, March 11, 2010 8:00 AM To: [email protected] Subject: RE: Concealed spaces I failed to add that the gypsum will be applied directly to the floor joist and a suspended tile ceiling will be installed a couple feet below the gypsum. The gypsum, if not sealed at the joints could allow fire to enter the concealed joist space thus defeating the purpose of the gypsum. That's just what I envision but it may not pose a problem. My theory, however; will not be what he architect is looking for. Thanks Russell _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
