We have AHJs impose sprinklers at outside patios often. We have always done QR sprinklers in those instances and calculate at 0.05 density which leads to just 7 psi for 2 sprinklers. Never had an issue with it.
Travis Mack, SET MFP Design, LLC "Follow" us on Facebook: https://www.facebook.com/pages/MFP-Design-LLC/92218417692 Send large files to MFP Design via: https://www.hightail.com/u/MFPDesign Sent from my iPhone > On Sep 22, 2015, at 7:39 AM, Sean Lockyer <[email protected]> wrote: > > A question for everyone here: I have is a single family residence (NFPA 13D, > 2010 Edition) in which the owner is voluntarily wanting to protect the > exterior patio and lanai areas-all unheated areas. At the present, only Tyco > makes a residential dry pendent sprinkler; however, the owner also wants all > of the heads to be concealed and the only residential dry pendent is > semi-recessed. As such, the owner may then dictate that he wants > non-residential dry pendents that have a flat concealed plate. > > However, the local AHJ will (most likely based upon my prior experience) > require a proof calc of these areas in order to quantify the pipe sizing to > feed the non-residential standard heads. At that point it becomes a problem. > Per section 13D, 2010 Edition, 8.1.3.2 non-residential sprinklers are to be > installed per NFPA 13, not 13D, which would lend credence to a .10 > density/900 sq. ft. design area (after reduction), etc. and for a simple 13D > simple coming off of a 1" meter it won't wont (I already tried the calcs, not > even close). > > HOWEVER, the appendix (section A.8.6.4) states that a simple (2) head design > area using residential -or- quick response sprinklers may be used in > instances where the local AHJ requires the attic to be sprinkled. While this > is just the garage it kinda is in the same ballpark, intent-wise. > > In addition, section 8.1.2 states that the design area is to consist of (2) > sprinklers in the most demanding compartment although this appears to be > intended to apply to residential heads only, and not non-residential > sprinklers. > > I would love to use the Tyco, residential pendent but since Tyco is the only > manufacturer that makes a residential dry head they are getting their money's > worth and even if the owner is ok with semi-rec heads out in these areas he > may not be ok with the potential cost. > > I hate to admit that a "little" house is kicking my backside but this is a > bit of a grey area. > > What does everyone think ? I would like to say I can figure this out on my > own but I need to humble myself a bit and reach out into the community since > I have been eating too much humble pie lately, lol. > > > Sean Lockyer > Project Designer 4617 Parkbreeze > Court > Cell 386-279-1197 Orlando, > Florida 32808 > [email protected] Phone: 407-816-9101 > www.AITLifeSafety.com Fax: > 407-816-9104 > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
