Good morning Brian, Your fitters will hate you if they have to set the main high towards the ridge.
The best way is to use a single main, hung low, with 1" or 1-1/4" sprigs to the back to back sprinklers at the ridge. If you have a mechanical chase that extends in to the attic, you may have to be below that to make sure everything can drain. If you can coordinate with the attic catwalk, you want it to be offset of center and you'll hang your main on the side that the catwalk is not located. Be sure to "restrain" your sprigs as they will be over 4 feet. Taylor Schumacher CET -----Original Message----- From: Sprinklerforum <[email protected]> On Behalf Of Fpdcdesign via Sprinklerforum Sent: Wednesday, October 27, 2021 6:24 AM To: Sprinklerforum <[email protected]> Cc: Fpdcdesign <[email protected]> Subject: Re: Attic Piping I typically use option 2. Sometimes the framing at the peak can be a little funky and it is easier to adjust a smaller line. Also, I will put 1” outlets on any welded pipe for attic sprinklers, in case sprigs become necessary. Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080 (tel:860-535-2080) (ofc) 860-554-7054 (tel:860-554-7054) (fax) 860-608-4559 (tel:860-608-4559) (cell) > > On Oct 27, 2021 at 7:04 AM, <Brian Harris via Sprinklerforum > (mailto:[email protected])> wrote: > > > > Seems were seeing more and more wood framed buildings these days and with > that comes attics. Just curious what the general school of thought is with > running piping in these spaces. Is it better to run the Main high under the > ridges with back to back heads (size permitting) or is it better run Mains > low and then run smaller Mains up the slope feeding branches at the ridges? > I'm working on a job now that kinda resembles a long rectangle with no center > (courtyards). I have all the heads laid out with B/B at the ridges, some AP's > in the corners & throughout as needed. Just looking for ideas from some of > you with much more attic experience than I have. Brian Harris, CET BVS > Systems Inc. Design Manager bvssystemsinc.com > (http://bvssystemsinc.com)<http://bvssystemsinc.com/> Phone: 704.896.9989 > (tel:704.896.9989) Fax: 704.896.1935 (tel:704.896.1935) > _______________________________________________ Sprinklerforum mailing list > [email protected] > (mailto:[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 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
