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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. Moisture vapor transmission rate - Wikipedia

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

    Moisture vapor transmission rate (MVTR), also water vapor transmission rate (WVTR), is a measure of the passage of water vapor through a substance. It is a measure of the permeability for vapor barriers. There are many industries where moisture control is critical.

  4. 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 ...

  5. Tyvek - Wikipedia

    en.wikipedia.org/wiki/Tyvek

    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).

  6. Visqueen - Wikipedia

    en.wikipedia.org/wiki/Visqueen

    Visqueen is used as a condensation barrier inside walls when installing HVAC systems. It is also used as a ground cover in the crawl space of home foundations as a vapor barrier . [ 3 ] The use of Visqueen underneath a basement is to prevent water infiltration from water present in the ground that would pass through the concrete or dirt floor ...

  7. Lithium vanadium phosphate battery - Wikipedia

    en.wikipedia.org/wiki/Lithium_vanadium_phosphate...

    Vanadium phosphates have been investigated as potential cathodes for Li-ion batteries: including lithium vanadium phosphate, Li 3 V 2 (PO 4) 3; [1] [2] the same material prepared by sol gel methods showed lithium insertion/removal over a 3.5 to 4.1 V range, with evidence of three stages of insertion/removal.

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