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Tyvek's properties—such as being difficult to tear but easily cut, and waterproof against liquids while allowing water vapor to penetrate—have led to it being used in a variety of applications. Tyvek is often used as housewrap , a synthetic material used to protect buildings during construction, or as personal protective equipment (PPE).
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).
A building wrapped with Tyvek-brand housewrap during construction. Housewrap (or house wrap), also known by the genericized trademark homewrap (or home wrap), generally denotes a modern synthetic material used to protect buildings.
Tyvek: Dupont Company produces non-woven polyethylene which can be converted into bag. This cloth is used as a damp proofing membrane, envelopes and protective clothing amongst other things. These types of bags are strong but not as breathable as others.
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]
The simplest, least expensive package is a paper envelope. More expensive versions add a transparent window to the envelope allowing the disc label to be seen. [21] The envelope can also be made out of spunbonded polyethylene (trade-named Tyvek) which is stronger and lighter than paper and is resistant to moisture. [22]
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