I believe that two layers of the Type X make the space between the presumably non-combustible ceiling and the sheetrock a non-combustible concealed space.
Steve Leyton (Sent from my smartphone; please excuse typos and voice-to-text corruptions.) -------- Original message -------- From: "George Medina Jr." <[email protected]> Date: 1/16/24 10:12 AM (GMT-08:00) To: Discussion List On Issues Relating To Automatic Fire Sprinklers <[email protected]> Subject: [Sprinklerforum] Concealed Spaces Not Requiring Sprinkler Protection There is a one hour floor assembly which consist of 22" Red-S joist (Wood Chords with Tube Bars) with 2 layers of type x gypsum board on channels below joist. Could it be considered limited combustible construction inside the bar joist? Or am I just grasping for straws, and it needs sprinklers. Thanks For any replies, George Medina Jr.
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