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What is the name of this roof sheathing?


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Try this for gypsum board/roof sheathing info:


Unless you know the manufacturer you should use the generic name.

Yeah, I thought so too but I'd still like more info. We see whole condos built out here with gypsum board incorporated into exterior cladding and roofs as a means to control flame spread.



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It's hard to tell from the photo, but I see no evidence of that gyp board being mounted on the inside of the truss; it almost looks like it's installed in place of the OSB; is that correct?

The gyp board is installed on top of the trusses and the structural sheathing on top of that. The trusses that are installed within 4' of the area separation walls are 5/8" shorter than the others to allow for the thickness of the gyp board.
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