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Cold and moisture vapor barrier

Published:2014-01-12 14:18:38 Source:
Envelope cold insulating layer is provided to reduce heat transfer, but in the heat transfer process, the water vapor in the atmosphere at different temperatures and also transmitted as the low temperature side from the high temperature side (i.e., high partial pressure of water vapor transmitted to the side of the low pressure side of the water vapor). When water vapor through the building envelope, the envelope in the pore structure of the material condenses into water. Cold water or ice cream is formed, so that the thermal conductivity of the material greatly increased insulation material loses its insulating properties, and in severe damage to the cold storage building envelope. Thus, in the heat insulation material side vapor barrier must be set in order to prevent roof water, groundwater, surface water, water penetrated library insulation layer disposed vapor barrier is also very necessary.
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