Just wondering if there is a consensus on whether or not drywall is required behind a ship lap ceiling. Above the ship lap would be strapping, then poly which is my air barrier that was installed before interior walls and sealed, followed by blown in cellulose. I’ve tried to minimize punctures in the poly as much as possible and will be taping it up as best I can before insulation/finished ceiling.
Another cheaper option than finished drywall would be 3/8 plywood with seems taped, then my ship lap would go on that. Plywood would be somewhat difficult to seal to electrical boxes, bath fans etc. in a meaningful way. Seems like this method might be overkill.
Thanks for any input!
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