Not sure of the consesus for the previous postings. But how I look at it is:
If you use residential heads they must comply with manufacturer's installation instructions. If a sidewall is DESIGNED for 12" below the ceiling it must be maximum 12" below the highest ceiling in its area of coverage. So if you have a soffit, the s/w can be below the soffit, provided it is no more than 12" below the highest ceiling (in its area of coverage). Rsidential pendent heads will be a problem. You'd have to be 1 to 4" below the highest ceiling (in it area of coverage) and also be not obstructed by the lower ceilings. So you'd need heads in the pockets and also maybe below the lower ceilings. Unless of course, the head listing permits greater distance from deflector to ceiling. If you can use non-residential sprinklers then I think the 13 pockets rules should apply, even though the building is 13R. If building is 13D, unless it has being revised, all heads have to be residential (check, maybe it has been changed). That is what I think. Tony -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Todd Williams Sent: April 6, 2009 9:52 AM To: [email protected] Subject: NFPA 13R/D and ceiling pockets I know there was some discussion a while back re how to treat ceiling pockets in a 13R or D occupancy. I couldn't find it in my archives and the Forum section of firesprinkler.org crashed Firefox (that will teach me to argue with Steve...). What was the consensus on how to treat this? Todd G. Williams, PE Fire Protection Design/Consulting Stonington, Connecticut www.fpdc.com 860.535.2080 _______________________________________________ Sprinklerforum mailing list http://lists.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 http://lists.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)
