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2. Housewrap - Wikipedia

   en.wikipedia.org/wiki/Housewrap

   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.

3. Tyvek - Wikipedia

   en.wikipedia.org/wiki/Tyvek

   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]

4. Air barrier - Wikipedia

   en.wikipedia.org/wiki/Air_barrier

   Air barrier systems – Combinations of air barrier assemblies and air barrier components, connected by air barrier accessories, that are designed to provide a continuous barrier to the movement of air through an environmental separator, which has an air leakage rate no greater than 2.00 L/(s•m 2) at a pressure difference of 75 Pa when tested ...

5. Vapor barrier - Wikipedia

   en.wikipedia.org/wiki/Vapor_barrier

   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.

6. Waterproofing - Wikipedia

   en.wikipedia.org/wiki/Waterproofing

   In construction, a building or structure is waterproofed with the use of membranes and coatings to protect contents and structural integrity. The waterproofing of the building envelope in construction specifications is listed under 07 - Thermal and Moisture Protection within MasterFormat 2004, by the Construction Specifications Institute, and includes roofing and waterproofing materials.

7. BS 1088 - Wikipedia

   en.wikipedia.org/wiki/BS_1088

   Moisture Content-- BS 1088 plywood must have a moisture content between 6% and 14% when it leaves the factory. Finishing -- Boards will be sanded on both sides equally. Length & Width -- The length or width of a board produced as a standard size shall not be less than the specified size nor more than 6.3 mm (0.25") greater than the specified size.