Also, look at the IBC for stages and prosceniums. I believe that is where you'll find Allen's standpipe requirement, among other whats and wheres.
On Sat, Oct 7, 2017 at 5:11 AM, Mark.Phelps <[email protected]> wrote: > All good and true information Allen. I'm away from the "books" Right now > but I believe a standpipe valve also needs to be installed at the stage > area. Look up "Proscenium protection" in a word search in NFPA 13 and get > the whole story. > > Mark at Aero > 602 820-7894 <(602)%20820-7894> > > Sent from my iPhone > > On Oct 6, 2017, at 9:20 PM, AKS-Gmail-IMAP <[email protected]> wrote: > > 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. 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