Here in the Adirondacks, building in the “great camp” style requires that one do a considerable amount of ceiling and wall areas in wood. Planks, birchbark, twigs, log slabs, beadboard, etc., etc. Do the codes in your areas typically require that a finish like this, whether on wall or ceiling, first be sheeted in gypboard?
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Not necessarily required by code, but its a good idea, not only as a fire barrier, but it also helps seal up a living space against spiders, cluster flies (really bad in the NW this year), bat intrusion from the attic (in the case of twigs) and, if not bats, then guano from them and rodents. And if not any of the above, the drywall can help seal out dust from the attic.
With T&G materials, there's less of a problem, especially with narrower pieces (3") where there might be shrinkage after installation. It's quite common for log homes, or timber frames to have vaulted ceilings planked with wood and there's seldom a problem from my observation. But these have been occupied homes with a fairly stable temp/humidity environment indoors.
I don't know your situation, but I've worked on some vacation homes and cabins that get occasional use and the above problems have cropped up frequently. Those twig ceilings can look very attractive, but they can also have their downside.
I've seen a couple situations where rosen paper was put up first, which seemed to help some, but there was evidence the mice had been chewing on it some.