Yes, and judging by the original question, you might be totally missing the boat as to what is needed and what goes on in what sounds like a full stage situation. Its the sprinklers underneath the grid iron that do the heavy lifting, not the sprinklers above the grid iron. The theater sets and curtains get pulled up to the grid iron, so you’ll need to find out how high they go and you’ll have to be comfortable with whatever sprinkler spacing you come up with. It may be 6 or 8 feet from stage from to back. They’ll need guards, be multilevel and not be ordinary temperature. Beware the lights. Stages often get little AC or air movement because it can make noise and move the curtains. So up there at the grid iron and above is warmer than typical. There will probably be a catwalk level below the grid iron on the pulley side that requires sprinklers underneath it. There would also be an automatic smoke vent or two at the roof level that might have to be manually closed, which might mean some unlucky person has to do it from the grid iron level. You don’t want to have a part of the deck level sprinkler piping in the way making that task any more difficult than what it might be.
Allan Seidel St. Louis, MO > On Oct 6, 2017, at 5:57 PM, Matthew J Willis <[email protected]> wrote: > > Negative. Check IBC for Grid Iron above stage. You need a compliment below it > as well > R/ in the > Matt > > Sent from my Verizon 4G LTE Droid > On Oct 6, 2017 4:42 PM, "Reed A. Roisum, SET" <[email protected]> wrote: > I did take a look at the archives and found some information, but wondering > about positioning of sprinklers above and below an “slatted” ceiling. Not > sure if that is the correct terminology. > > It is above a stage where the rigging pulleys etc. are attached. There are > sprinklers at the deck which is probably 10’ above the slats. The slats are > between 3”-3 ½” wide (going off of photos) with approximately 1” – 1 /4” gap > between. They are about 1” – 1 ½” thick. They look roughly 2 x 4 sized, but > they are metal. There are no sprinklers located underneath the slats. There > are a few larger gaps to avoid other structural members etc. and then the > cross supports underneath are probably 4” wide every 5’ or so. > > Would this be considered an Open-Grid Ceiling from NFPA 13, 2013 ed. 8.15.14? > A.8.15.14 says, “The installation of open-grid egg crate, louver, or > honeycomb ceilings beneath sprinklers restricts the sideways travel of the > sprinkler discharge and can change the character of the discharge.” Is what > I described more like a “louver” ceiling? > > I know the gap is more than a ¼”. We will say that the thickness does not > exceed the least dimension of the opening (its close). It’s tough to say > whether it is 70% open or not?? In portions definitely not. > > Question is, if I can meet all three of the above requirements then I do not > need to install sprinklers under this slatted “ceiling”? But if can’t meet > one of the requirements then I do need sprinklers underneath? > > Thank you for any insight. > > Reed > > > > > > > > Reed A. Roisum, SET | Karges-Faulconbridge, Inc. | Senior Fire Protection > Designer | Fargo, ND | direct: 701.552.9903 | mobile: 701.388.1352 | > KFIengineers.com <http://www.kfiengineers.com/> > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please visit http://www.symanteccloud.com > ______________________________________________________________________ > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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