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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 ] That fluff was a form of polyethylene, which DuPont requested a patent for within a year of the discovery.
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.
Exterior insulation finishing system. A historic brick building in Germany covered with EIFS on the right side. Exterior insulation and finish system (EIFS) is a general class of non- load bearing building cladding systems that provides exterior walls with an insulated, water-resistant, finished surface in an integrated composite material system.
The function of a vapor barrier is to retard the migration of water vapor. A vapor barrier is not typically intended to retard the migration of air. This is the function of air barriers. [8] Air is mixed with water vapor. When air moves from location to location due to an air pressure difference, the vapor moves with it.
Olefin fiber. Olefin fiber is a synthetic fiber made from a polyolefin, such as polypropylene or polyethylene. It is used in wallpaper, carpeting, [1] ropes, and vehicle interiors. Olefin's advantages are its strength, colorfastness and comfort, its resistance to staining, mildew, abrasion, and sunlight, and its good bulk and cover.
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). Self-adhered membranes ...
In carpentry, scrim is a very heavy, coarsely-woven fabric (similar to hessian or to coarse canvas) which is stretched over interior boards to provide support for wallpaper and to add an extra rigidity. This method of construction, widely used in older houses, is often referred to as "scrim and sarking", the sarking being the board.
Optical disc packaging. Stacks of compact disc jewel cases. Optical disc packaging is the packaging that accompanies CDs, DVDs, and other formats of optical discs. Most packaging is rigid or semi-rigid and designed to protect the media from scratches and other types of exposure damage.
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