Poly air barrier on outside vaulted ceiling
I’m in climate zone 5A about to install a tongue and groove pine ceiling on the underside of the vaulted scissor trusses above a covered back deck. The homeowner had us to throw in Kraft faced insulation he had on hand incase he ever wants to close it in. From my understanding if he was going to close it in and blow any heat it would be necessary to create an air barrier behind the T&G. Inside we ran drywall to create an air barrier but this being outside I don’t think that would be the right thing to do. Would I be fine to run poly and carefully air seal to create my air barrier in case he ever decides to close this space in? We don’t run poly on the ceilings inside here but in theory I would be fine?
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