I am the building designer. I am trying not to have to put a hard lid above the wood slat ceiling. We are using an Armstrong product, class A rated, with 6" wood slats and a 1/2" gap between the slats (and black felt at the gaps so you can't see through them but the felt is porous, obviously)...
Hello, I have a question relating to fire sprinkler systems above a wood slat ceiling where the space above is a open plenum return. The space is about 5,500 SF and in a type 5, 1-hour rated construction type. The wood trusses have two layers of gyp board on the bottom chord of the truss but...
