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- vapor diffusion
Movement of water vapor through a material; water vapor can diffuse through even solid materials if the permeability is high enough.
- vapor profile
A vapor profile is an assessment of the relative vapor permeabilities of each individual component in a building assembly and a determination of the assembly's overall drying potential and drying direction based on vapor permeabilities of all of the components. The vapor profile addresses not only how the building's enclosure assembly protects itself from getting wet, but also how it dries when it gets wet. For a detailed treatment of this subject, see Building Science Corporation's article Understanding Vapor Barriers.
- vinyl
Common term for polyvinyl chloride (PVC). In chemistry, vinyl refers to a carbon-and-hydrogen group (H2C=CH–) that attaches to another functional group, such as chlorine (vinyl chloride) or acetate (vinyl acetate).
- VOC
Volatile organic compound. An organic compound that evaporates readily into the atmosphere; as defined by the U.S.
Environmental Protection Agency, VOCs are organic compounds that volatize and then become involved in photochemical smog production.- VOCs
Volatile organic compound. An organic compound that evaporates readily into the atmosphere; as defined by the U.S. Environmental Protection Agency, VOCs are organic compounds that volatize and then become involved in photochemical smog production.
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