Vapor Barrier Tongue And Groove Ceiling

The ceiling boards have a noticeable gap at the tongue and groove.

Vapor barrier tongue and groove ceiling.

If you pay attention to airtightness when you install your air barrier you don t have to worry very much about vapor diffusion. Don t forget to use airtight electrical boxes and to seal all of the air leaks at all penetrations. A vapor retarder is a material used to prevent water vapor from diffusing into the wall ceiling or floor during the cold winter. 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.

Whether or not you need a vapor retarder hinges on three main factors your climate your home and the location of the wall you re insulating. That leads me to believe heated air may be escaping the rooms through the gaps. It s also incorrect in a way. 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.

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. To know if you need a vapor retarder ask yourself a few basic questions. For example see how to build an insulated cathedral ceiling. I am considering putting up poly or tyvek.

Gba has long advised people installing a tongue and groove board ceiling to first install an air barrier of gypsum drywall. The biggest air barrier blunder is to install tongue and groove boards as your finish ceiling without first installing taped. I am concerned with air dust dirt leakage between the planks. I am attaching the planks directly to the bottom of trusses.

The article includes this advice.