Vapor Barrier Tongue And Groove Ceiling

For example see how to build an insulated cathedral ceiling.

Vapor barrier tongue and groove ceiling.

The ceiling boards have a noticeable gap at the tongue and groove. I am concerned with air dust dirt leakage between the planks. Now i m a real fan ha ha of controlled mechanical ventilation to limit interior moisture levels in cold and mixed climates as well as to. The biggest air barrier blunder is to install tongue and groove boards as your finish ceiling without first installing taped.

If you pay attention to airtightness when you install your air barrier you don t have to worry very much about vapor diffusion. Gba has long advised people installing a tongue and groove board ceiling to first install an air barrier of gypsum drywall. I am considering putting up poly or tyvek. I am attaching the planks directly to the bottom of trusses.

I am adding a tongue and groove cedar plank ceiling to a heated room in my pole barn. It s also incorrect in a way. Should i have a vapor barrier between the planks and the blown in insulation. My thought is to remove the batts and install 1 foil faced foam board foil towards the heated rooms then seal any gaps between the foam board and ceiling rafters.

Omitting a ceiling vapor barrier by arguing that you have to let the moisture escape or because the house has to breathe out the top is actually correct in a way. A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor during the cold winter. The best air barrier under tongue and groove boards is a layer of gypsum wallboard. The article includes this advice.

Don t forget to use airtight electrical boxes and to seal all of the air leaks at all penetrations.