| Conceptual Reference Database for Building Envelope Research |
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Concept:vapor barrier, vapor retarderMaterials: asphalt laminated papers, aluminum foil and plastic film
Example of vapor retarders Desjarlais, A. O., Petrie, T. W., Childs, P.W., and Atchley, J. A., 1998 * a system typical of U.S. construction with a liquid water permeable vapor retarder, * a system typical of European construction with a liquid water permeable vapor retarder, * a top-ventilated system with a polyethylene vapor retarder, and * an impermeable control system with a polyethylene vapor retarder
Indoor Vapor Barrier Vapor barriers control the flow of exfiltration of conditioned air, which is moisture laden, into the wall sections. Vapor barriers are a polyethylene plastic that are impermeable to moisture movement, and are installed before the dry wall. They are always installed on the warm side of the home since Lincoln is in a heating climate. The vapor barrier should be continuous with all joints taped or caulked to make the wall section as airtight as possible. Moisture in the vapor form that is allowed to enter the wall section can result in condensation, which creates a structural durability issue. Rose, W. (1997a). "Control of Moisture in the Modern Building Envelope: the History of the Vapor Barrier in the United States 1923-1952." APT Bulletin, Vol. XVIII (No. 4, October 1997). Referred by Rose, W. B. and McCaa, D. J., 1998, Temperature and moisture performance of wall assemblies with fiberglass and cellulose insulation
Vapor retarders can be classified into two major groups: flexible or coatings. Metal foils, laminated foils, treated paper, and plastic films are flexible sheet goods, while paint, semi-fluid mastic, and hot melt are coatings. In typical residential construction and rehabilitation, the commonly used materials are exterior or / interior applied plastic films, interior-applied foil-faced products, interior treated paper-faced products, and interior paint coatings. | ||
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