I'm merely asking 'cause I didn't look anything up and I don't even have an opinion but if your TJIs are blocked and compartmentalized to the 164 cuft (again, I didn't look anything up but think that's the number) would that then eliminate the 3000 sqft design area rule?
On Tue, May 4, 2010 at 11:00 AM, A.P.Silva <[email protected]> wrote: > My question is: > > For the 3000 ft2 design, do I need to (1) include all QR and RES heads in > the 3000 ft2 area. Or (2) do I need to go to the full 3000, regardless of > the "length" of the design area to include only QR heads? Or (3) include > only QR heads up to the "length" of the 3000 sq.ft. not necessarily the full > 3000 sq.ft. > > By "length" I mean the 1.2x sq.rt. Of 3000 sf. > > Tony > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Thom McMahon > Sent: April 3, 2010 10:33 AM > To: [email protected] > Subject: RE: Residential sprinklers > > Tony: > 11.2.3.1.4 Restrictions. Regardless of which of the two methods > (density/area or room design method) is used, the following restrictions > shall apply: > (3)*Unless the requirements of 11.2.3.1.4(4) are met for buildings having > un-sprinklered combustible concealed spaces, as described in 8.15.1.2 and > 8.15.6, the minimum area of sprinkler operation for that portion of the > building shall be 3000 ft2 (279 m2). The design area of 3000 ft2 > (279 m2) shall be applied only to the sprinkler system or portions of the > sprinkler system that are adjacent to the qualifying combustible concealed > space. > > I'd say that since Residential head design is not "Room Design" it does not > need to meet the room design criteria if you're using residential listed > heads. (4 Head design) When you switched from res. Heads to the QR heads for > your "other rooms" > your back to room design, and must meet 11.2.3.1.4(3) > > I spend a lot of time teaching AHJ's , that as soon as you see tji's you > need to start looking for a 3000 SF remote area, and if you don't see one > you need to look closely as to why you don't see one. Res. Heads will get > you out of it in res. Occupancies, but only where they are allowed. > > Don't forget the tail end of (3) says "The design area of 3000 ft2 > (279 m2) shall be applied only to the sprinkler system or portions of the > sprinkler system that are adjacent to the qualifying combustible concealed > space." > > Thom McMahon, SET > Firetech, Inc. > 2560 Copper Ridge Dr > P.O. Box 882136 > Steamboat Springs, CO 80488 > Tel: 970-879-7952 > Fax: 970-879-7926 > > > > Subject: RE: Residential sprinklers > > In the other rooms I'm using non-res heads and calculating all heads in such > rooms that are adjacent to each other. This works out to about 12 heads, > less than 3000 sf. I hope I don't have to extend the design area to the > corridors and patient rooms to get up to 3000 sf, as the different k factors > would create havoc. > > _______________________________________________ > 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) > -- Ron Greenman Instructor Fire Protection Engineering Bates Technical College Tacoma, WA Member: SFPE, ASCET, NFPA, AFSA, NFSA AFAA, NIBS, WSAFM, WFC _______________________________________________ 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)
