The Importance of Vapor Retarders in
Certain Climates
Vapor travels from high pressure to low
pressure. Moisture-laden air is literally "pushed" through
penetrations in the building envelope. The moisture could damage the insulation
and even the framing members, but a continuous vapor barrier helps prevent this
from happening.
Source: http://www.energycodes.gov/training/res_wbt/vapor_pressure.stm
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