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Air barriers control air leakage into and out of the building envelope. This allows for more durable buildings as moisture is kept out and also results in significant energy savings. Air barrier products may take several forms:
- Mechanically-attached membranes, also known as housewraps, usually a polyethylene-fiber or spun-bonded polyolefin product that allows vapor transmission, such as Tyvek
- Self-adhered membranes, which are typically waterproof and vaporproof
- Fluid-applied membranes, such as heavy-bodied paints or coatings
- Closed-cell spray-applied polyurethane foam, which typically provides insulation as well
Air barriers and water vapor
Air barriers may be permeable to water vapor. This is because water fits through narrower pores than the other main constituents of air, oxygen and nitrogen.
See also
External links
- Air Barrier Design
- Air Barrier Association of America
- National Air Barrier Association (Canadian)
- Air Barrier Systems for Walls of Low-Rise Buildings
- U.S. Markets Seeking Air Barrier Expertise
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- This page was last modified on 18 November 2008, at 21:32.
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