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
