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2. Vapor barrier - Wikipedia

   en.wikipedia.org/wiki/Vapor_barrier

   A vapor barrier on the warm side of the envelope must be combined with a venting path on the cold side of the insulation. This is because no vapor barrier is perfect, and because water may get into the structure, typically from rain. In general, the better the vapor barrier and the drier the conditions, the less venting is required. [7]

3. Tyvek - Wikipedia

   en.wikipedia.org/wiki/Tyvek

   According to DuPont's website, Tyvek fibers are 0.5–10 μm (2.0 × 10 −5 –0.000394 in) (compared to 75 μm (0.0030 in) for a human hair). The nondirectional fibers (plexifilaments) are first spun and then bonded by heat and pressure, without binders. [10] Tyvek is also: Lightweight; Has a Class 1 flammability rating. "When exposed to a ...

4. Air barrier - Wikipedia

   en.wikipedia.org/wiki/Air_barrier

   Air barrier products may take several forms: Mechanically-attached membranes, also known as housewraps, usually a polyethylene-fiber or spun-bonded polyolefin, such as Tyvek is a generally accepted moisture barrier and an air barrier (ASTM E2178). Self-adhered membranes, which are typically also a water-resistant barrier and a vapor barrier

5. Housewrap - Wikipedia

   en.wikipedia.org/wiki/Housewrap

   Housewrap functions as a weather-resistant barrier, preventing rain or other forms of moisture from getting into the wall assembly while allowing water vapor to pass to the exterior. If moisture from either direction is allowed to build up within stud or cavity walls, mold and rot can set in and fiberglass or cellulose insulation will lose its ...

6. Moisture vapor transmission rate - Wikipedia

   en.wikipedia.org/wiki/Moisture_vapor...

   The building materials industry also manages the moisture barrier properties in architectural components to ensure the correct moisture levels in the internal spaces of buildings. Optoelectronic devices based on organic material, generally named OLEDs , need an encapsulation with low values of WVTR to guarantee the same performances over the ...

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