I would like to do car siding on ceilings throughout most of first and second floors in a new construction. Attached pic is from current cottage. That was done directly on ceiling joists. Do you think I would have to drywall first or can I nail car siding directly to joists? Is this something inspector would want called out? Thanks
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Drywall would be an acceptable fire barrier.
For this purpose, I think you would need two layers of inch nominal lumber with staggered edges.
Thanks. Drywall under easy safety measure. Can you tell me what you mean by 2 layers of wood? Would that be plywood plus siding or 2 layers of siding?
https://up.codes/s/fireblocking
See paragraphs on fireblocking materials.
Fireblocking shall consist of the following materials:
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Two thicknesses of 1-inch (25 mm) nominal lumber with broken lap joints.
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One-half-inch (12.7 mm) gypsum board.
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Could be for the first floor ceiling, the second story subfloor could serve this purpose.
Be sure to acclimate and pre-finish your material prior to install as seasonal movement is guaranteed.