Best Vapor Barrier For Cathedral Ceiling. (air leakage causes far more problems than vapor diffusion.) for more information, see how to build an insulated cathedral ceiling. if it's just a 2x12, not a truss, a high density. here are a few best practices to remember when insulating vaulted ceilings:
Class 1 ( or class i) vapor barriers have a permeability of 0 to 0.1 perm. (air leakage causes far more problems than vapor diffusion.) for more information, see how to build an insulated cathedral ceiling. if it's just a 2x12, not a truss, a high density. It is essential to have a vapor barrier installed with your ceiling insulation.
here are a few best practices to remember when insulating vaulted ceilings: watch this 3 1/2 minute q&a about a real situation in southern quebec. the question now is if you’ll also need to protect your ceiling from moisture caused by insulation. as with all cathedral ceilings, you have to pay attention to airtightness.
