Exterior Roof Insulation and Interior Vapour-barriers

In his blog on cathedral ceilings  https://www.greenbuildingadvisor.com/article/five-cathedral-ceilings-that-work  Martin notes that assemblies with both exterior foam and permeable cavity insulation should not have an interior vapour-barrier so they can dry to… In his blog on cathedral ceilings  https://www.greenbuildingadvisor.com/article/five-cathedral-ceilings-that-work  Martin notes that assemblies with both exterior foam and permeable cavity insulation should not have an interior vapour-barrier so they can dry to…Read MoreGreenBuildingAdvisor