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  2. 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.

  3. Waterproofing - Wikipedia

    en.wikipedia.org/wiki/Waterproofing

    Walls also have vapor barriers or air barriers. Damp proofing is another aspect of waterproofing. Masonry walls are built with a damp-proof course to prevent rising damp , and the concrete in foundations needs to be damp-proofed or waterproofed with a liquid coating, basement waterproofing membrane (even under the concrete slab floor where ...

  4. Damp proofing - Wikipedia

    en.wikipedia.org/wiki/Damp_proofing

    Concrete normally allows moisture to pass through so a vertical vapor barrier is needed. Barriers may be a coating or membrane applied to the exterior of the concrete. The coating may be asphalt, asphalt emulsion, a thinned asphalt called cutback asphalt, or an elastomer. [9] Membranes are rubberized asphalt or EPDM rubber. Rubberized products ...

  5. 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.

  6. Breathability - Wikipedia

    en.wikipedia.org/wiki/Breathability

    Because the ionic bond is relatively weak, the water then gets pushed through the gaps until the water vapor passes all the way through. Driving Force is the difference in the level of heat and humidity on one side of the material compared to the other side. Also known as the Differential Pressure.

  7. Building envelope - Wikipedia

    en.wikipedia.org/wiki/Building_envelope

    The difference can be illustrated by the fact that an insulated attic floor is the primary thermal control layer between the inside of the house and the exterior while the entire roof (from the surface of the roofing material to the interior paint finish on the ceiling) is part of the building envelope. [11]

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