This is a detailed guidance paper on difference applications of vapour barriers in difference climates in the US. Where it is located in an assembly and its permeability is a function of climate, the characteristics of the materials that comprise the assembly and the interior conditions. Vapour barriers are not typically intended to retard migration of air. That is the function of air barriers. Confusion on the issue of vapour barriers and air barriers is common. The confusion arises because air often holds a great deal of moisture in vapour form. When this air moves from location to location, due to an air pressure difference, the vapour moves with it. This is a type of migration of water vapour. In the strictest sense air barriers are also vapour barriers when they control the transport of moisture-laden air.


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  • 8 March 2014 Creation Date
  • 25 September 2019 Last Updated