Energy Glossary Definition (English)
Vapor Barrier Defined
The following is in context to Energy, because it's common for a single word to have multiple meanings you will find additional research links near the bottom of the page.
"A material with a permeance of one perm or less which provides resistance to the transmission of water vapor. [See California Code of Regulations, Title 24, Section 2-5302]"
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Additional Vapor Barrier Definition Starting Points
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Expert Dictionary: Vapor Barrier
