It would only be a problem if the rafter depth plus gob depth exceeded deflector depth, so you're looking at 16" to 22" (6" variation, like you said).
But in that regard, it is not an activation issue, it is only an obstruction issue. Shave it where necessary to not be an obstruction? On Mar 29, 2016 12:07 PM, "Brian Harris" <[email protected]> wrote: > Brad- > The real issue we're having is the haphazard way the sprayed on insulation > was installed, there's no way to establish minimum & maximum deflector > distances. > > Brian Harris, CET > BVS Systems Inc. > bvssytemsinc.com > > > -----Original Message----- > From: Sprinklerforum [mailto: > [email protected]] On Behalf Of Brad > Casterline > Sent: Tuesday, March 29, 2016 11:23 AM > To: [email protected] > Subject: RE: Tyco Attic Heads > > Nope. Smoothness above the sprinkler only affects activation times, and > the differences are only a few seconds. > Do you worry if the intermediate framing members are 2x4, 2x6, 2x8, or > 2x10 (a 6" variation)? Do you worry if they are perpendicular or parallel > to the throw? No, because min deflector distance for back-to-back at the > peak is 16". This is to get the throw beneath the 'unsmoothness' of the > bottom of the deck. > The U.L. tests of Tyco BB heads 'started' with previously listed QR, EC > heads- only the Deflectors were changed, and the throw patterns at > different pressures were measured. They did that by not changing the bottom > of the deck or changing deflector distance, but by raising and lowering the > Floor :). > > And actually I think a little roughness at the bottom of the deck might > even enhance activation a bit-- but I am certainly no Sprinkler Scientist- > and the Modeling of BB heads activation and patterns I have done has been > rather coarse, i.e., quick and dirty ;) > > b > On Mar 29, 2016 9:46 AM, "Brian Harris" <[email protected]> wrote: > > > I talked with tech support and while he wasn't too concerned about the > > roughness off the insulation he did agree the insulation needs to be > > "shaved" to a uniform depth to assure proper deflector distances. > > > > Brian Harris, CET > > BVS Systems Inc. > > bvssytemsinc.com > > > > > > -----Original Message----- > > From: Sprinklerforum [mailto: > > [email protected]] On Behalf Of Bruce > > Verhei > > Sent: Tuesday, March 29, 2016 10:44 AM > > To: [email protected] > > Subject: Re: Tyco Attic Heads > > > > I like Matt's advice. Tyco may have information from original test > series. > > Sometimes some of conditions are to meet extreme distance or a minimum > > available pressure. > > > > While I'd repeat that Tyco's comments would apply to this particular > > project only, could you post? > > > > Best > > > > Bruce > > > > > On Mar 29, 2016, at 06:41, Matt Grise <[email protected]> wrote: > > > > > > I would call tyco's technical hotline. > > > > > > Matt Grisé PE*, LEED AP, NICET II > > > Sales Engineer > > > Alliance Fire Protection > > > 130 w 9th Ave. > > > North Kansas City, MO 64116 > > > > > > *Licensed in KS & MO > > > > > > 913.888.0647 ph > > > 913.888.0618 f > > > 913.526.7443 cell > > > www. AFPsprink.com > > > > > > > > > > > > -----Original Message----- > > > From: Sprinklerforum > > > [mailto:[email protected]] On Behalf Of > > > Brian Harris > > > Sent: Tuesday, March 29, 2016 8:40 AM > > > To: [email protected] > > > Subject: RE: Tyco Attic Heads > > > > > > "bounce..." > > > > > > Brian Harris, CET > > > BVS Systems Inc. > > > bvssytemsinc.com > > > > > > -----Original Message----- > > > From: Sprinklerforum > > > [mailto:[email protected]] On Behalf Of > > > Brian Harris > > > Sent: Tuesday, March 29, 2016 8:23 AM > > > To: [email protected] > > > Subject: Tyco Attic Heads > > > > > > Working on a project that we've installed Tyco attic heads and the > > > GC > > has now gone in and added roughly several inches of spray on insulation. > > When I say roughly I mean roughly, the depth varies from 6" to 12" > > with no consistency what so ever. I've told them that most of the > > piping will have to be lowered to stay within the required clearances > > but I also think the insulation needs to be "shaved" to a smooth > > consistent finish, obviously that didn't go over so well. Since attic > > heads are considered extended coverage I think it's safe to assume > > they need to be installed per the requirements of NFPA as well, under > > a smooth flat surface. Am I missing something? > > > > > > Brian Harris, CET > > > BVS Systems Inc. > > > Sprinkler Division > > > bvssystemsinc.com<http://bvssystemsinc.com/> > > > Phone: 704.896.9989 > > > Fax: 704.896.1935 > > > > > > _______________________________________________ > > > Sprinklerforum mailing list > > > [email protected] > > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprin > > > kl er.org _______________________________________________ > > > Sprinklerforum mailing list > > > [email protected] > > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprin > > > kl er.org _______________________________________________ > > > Sprinklerforum mailing list > > > [email protected] > > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprin > > > kl > > > er.org > > > > _______________________________________________ > > Sprinklerforum mailing list > > [email protected] > > > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > > er.org _______________________________________________ > > Sprinklerforum mailing list > > [email protected] > > > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > > er.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 > _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
