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Housewrap (or house wrap), also known by the genericized trademark homewrap (or home wrap), generally denotes a modern synthetic material used to protect buildings. 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.
The moisture barrier is applied to the entire wall surface with a mesh tape over joints and a liquid-applied membrane or a protective wrap like tyvek or felt paper. Then a drainage cavity is created and the other 3 layers, described above, are added.
Tyvek is a nonwoven product consisting of spun bond olefin fiber.It was first discovered in 1955 by a researcher for the DuPont textile company working in an experimental lab, who noticed a type of white fluff coming out of a pipe. [2]
Air barriers control air leakage into and out of the building envelope.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).
An improved continuous air barrier is almost always worth adding, as older homes tend to be drafty, and such an air barrier can be significant for energy savings and durability. Care should be exercised when adding a vapor barrier as it can reduce drying of incidental moisture or even cause summer (in climates with humid summers) interstitial ...
Can serve as a semi-permeable vapor barrier with a better permeability rating than plastic sheeting vapor barriers and consequently reduce the buildup of moisture, which can cause mold growth. Can fill wall cavities in finished walls without tearing the walls apart (as required with batts). Works well in tight spaces (like loose-fill, but ...
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