I would agree, but only if you could have a head located far enough from the edge of the vault so it was on a slope less than or = to 2/12 then the heads around the perimeter of the vault would act similar to a "Ceiling Pocket" with heads in the pocket. (In the barrel) But because this starts at a wall, it is no ceiling pocket. And I just don't think that you can get far enough in to have the heads on a slope of less than 2/12. The only way to check this is to know the true shape of the ceiling. Is it part of a true ARC or some other curved shape? What is the highest point, maybe you can still get a reduction in area to offset some of the 30% by using QR.
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 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ron Greenman Sent: Tuesday, June 03, 2008 3:49 PM To: [email protected] Subject: Re: Barrel Ceiling Thom, I'm not so sure I agree. if you plot out the degrees between where 3 1/2//12 and 0//12 on a quarter circle you get a pretty shallow arc. The 3 1/2//12 to 2 1/2//12 portion is a lot like attaching a collar tie to a 45 degree rafter a foot or so above the plate, rocking it all and then arguing for a 30% increase based on the foot or so section around the edge that's at 6//12. Since code does not address a solution to either situation the simple, conservative approach would be yours but I think an average slope along the entire arc should be the criterion. I didn't calculate this but I'd bet it's less than 2//12. On Tue, Jun 3, 2008 at 1:34 PM, Thom McMahon <[EMAIL PROTECTED]> wrote: > If you exceed the 2/12 (Flat) ceiling anywhere, increase by 30% > > 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 > > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Russell > Sent: Tuesday, June 03, 2008 10:24 AM > To: AFSA > Subject: Barrel Ceiling > > I'm looking at a project which has a room about 40 feet wide and has a > ceiling which is barrel shaped. It is not a deep barrel but rather a > large radius, it starts out at the wall with about a 3/12 pitch and as > it nears the apex it, of course, levels out. In trying to apply the > rule for design area increase due to sloping ceilings this situation > seems not to fit the written text very clearly. Can anyone offer an > opinion or point me towards a standard/code I can apply? > > > > Thanks, > > Russell > > _______________________________________________ > 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) > -- Ron Greenman at home.... _______________________________________________ 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)
