Good point. I just assumed true arc. back to the chariot. On Tue, Jun 3, 2008 at 3:05 PM, Thom McMahon <[EMAIL PROTECTED]> wrote: > 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) >
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