Dan, Thanks for reply and thoughts. I was not clear- this is not existing- I used Roland's reference to Fig. 8.6.4.1.1.3 in the beam obstruction rule thread as a starting point for sketching the situation with words. It is a design a few of us were scratching our heads about Friday afternoon, looking up the definition of ceiling pockets, worrying about deflector distance, etc.- "The high ceiling IS the ceiling, not a feature of the ceiling, that's what the soffit is". Saturday I did some fire modeling on it. I do not think it is smooth ceiling, unobstructed construction with max 12" deflector- IMHO it is obstructed, with max 6" deflector, below the high ceiling or the low ceiling, and that the previous comments made in this thread apply. Thanks again, Brad
-----Original Message----- From: Dan Wilder [mailto:[email protected]] Sent: Friday, February 12, 2010 3:57 PM To: [email protected] Subject: RE: Beam obstruction rules I think this would fall under beam pocket rules, not vertical changes in ceiling elevations. The 2010 code (2007 does not have the definition) defines this as 3.3.4-An architectural ceiling feature that consists of a bounded area of ceiling located at a higher elevation than the attached lower ceiling. So sprinklers would need to be installed in at least one of the two higher pockets (assuming QR)..... preferably 2 heads in each of the higher pockets - 4 total - using the 8.6.5.1.2(2) to avoid placing sprinklers in the lower soffit down the middle. Since your case involves an existing condition, adding sprinklers in one of the high pockets would meet the code, but look a little heavy on that side. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Brad Sent: Friday, February 12, 2010 11:46 AM To: [email protected] Subject: Beam obstruction rules Roland, Forum, If the head in the higher ceiling in 8.6.4.1.1.3 were not there- (the one in the lower ceiling covers the floor), would this "change" the acceptability? How about if you then mirrored it, so that you have a room 13' wide X 20' long, high ceiling 11'-2" , low ceiling is a 3' wide soffit centered width-wise, at 9'-6" height. There are 2 heads in the soffit now, spaced 13X10. Thanks, Brad _______________________________________________ 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) -- ExchangeDefender Message Security: Click below to verify authenticity http://www.exchangedefender.com/verify.asp?id=o1CLusmJ019192&from=d...@deser tfire.com _______________________________________________ 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)
