Todd: I think the temptation is to suggest that since the dome is smaller than the required area of sprinkler operation of 1,500 sq.ft., then we shouldn't have to increase the design area for the sloped portions of the dome. If the room was no more than 1,500 sq.ft. in area, I would agree with that approach. But in this case, the remote area could include flat ceiling adjacent to the dome. A fire could conceivably open more heads within the dome (and outside the base design area) due to the sloped ceiling.
Bottom line is that at there is no verbiage in NFPA 13 to suggest you can ignore the sloped ceilings of a dome when considering area increases. Mark A. Sornsin, PE Fire Protection Engineer Ulteig Engineers, Inc. 3350 38th Avenue S. Fargo, ND 58104-7079 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Todd Williams - FPDC Sent: Monday, July 21, 2008 9:29 AM To: [email protected] Subject: domed ceiling This must be sloped ceiling day. I have a client with a church project where the sanctuary is a cross and at the intersection is a dome. The ceilings around the dome are flat at approx 28 ft and the dome rises to 57 ft. The room area is approx 6400 sqft and the dome is 1200 sqft. Do we have to include the 30% increase for roof slope in the design area because of the dome? Todd G. Williams, PE Fire Protection Design/Consulting Stonington, Connecticut www.fpdc.com 860.535.2080 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
