Confusion Between Vapor Barrier and Air Barrier
The function of a vapor barrier is to retard the migration of water vapor, which are not typically intended to retard the migration of air. This is the function of air barriers. Air is mixed with water vapor. When air moves from location to location due to an air pressure difference, the vapor moves with it. This is a type of migration of water vapor. In the strictest sense air barriers are also vapor barriers when they control the transport of moisture-laden air. A discussion about the differences between vapor barriers and air barriers can be found in Quirouette.
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