Vapor barrier


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vapor barrier

[′vā·pər ‚bar·ē·ər]
(civil engineering)
A layer of material applied to the inner (warm) surface of a concrete wall or floor to prevent absorption and condensation of moisture.

Vapor barrier

Airtight skin of polyethylene of aluminum that prevents moisture from warm damp air in a building from passing into a colder space, causing condensation.

vapor barrier

vapor barrier
SeeVapor retarder.
References in periodicals archive ?
The Class II vapor retarder allowed inward drying in the summer (we were here before as well, see from "How Come Double Vapor Barriers Work?
For a wall the physics are the same; vapor barriers should be on the warm side if at all.
So it appears that adding montmorillonite-layered silicates to LPDE improves the water vapor barrier properties of low-moisture food packaging systems under 23 C and 50% relative humidity conditions.
The rule-of-thumb model doesn't say when to change from placing the vapor barrier on the inside of the insulation to the outside of the insulation.
Lstiburek's comments on vapor barriers, I feel the vapor barrier saved our neck.
Exhibiting properties such as excellent stiffness and water vapor barrier, controlled gel levels and ease of processing, the new grade has been specifically designed for use as a blend partner in transparent coextruded film structures, conventional coextruded film structures or in monolayer film structures.
Techbarrier is a series of oriented films coated with SiOx to achieve oxygen and water vapor barrier properties approaching those of aluminum foil.
Installing the vapor barrier on the outside of the wall in Alaska results in warm air condensing its water against the exterior sheathing, resulting in rotting of the exterior wall.
Because of its high permeability, it does not act as a vapor barrier.
At first, the California Air Resources Board's 15-year anticorrosion requirement for PZEV vehicles, combined with the need for an effective vapor barrier, had the industry concentrating on sealed stainless steel tanks.
Chaisson described the benefits of mica as a slip plane material as well as its ability to be a vapor barrier to moisture and carbon monoxide that is permeating through the porous working lining.
They provide roofing and siding for barns, create a vapor barrier in a variety of agricultural buildings and stabilize muddy areas on farms.