Vapor barrier - Wikipedia
A vapor barrier (or vapour barrier) is any material used for damp proofing, typically a plastic or foil sheet, that resists diffusion of moisture through the wall, floor, ceiling, or roof assemblies of buildings and of packaging to prevent interstitial condensation.
BSD-106: Understanding Vapor Barriers | buildingscience.com
2011年4月15日 · The function of a vapor barrier is to retard the migration of water vapor. Where it is located in an assembly and its permeability is a function of climate, the characteristics of the materials that comprise the assembly and the interior conditions. Vapor barriers are not typically intended to retard the migration of air.
Understanding Moisture Barriers - This Old House
2024年8月28日 · A moisture barrier, also called a vapor barrier or vapor retarder, is a material that stops water and moisture from passing through walls, floors, and other parts of a building. These barriers can come in different forms, like sheets, coatings, and membranes, and they’re categorized based on their permeability—how much moisture they allow ...
Vapor Barrier Definition in Construction: Importance, Types, and ...
2024年12月24日 · What is a Vapor Barrier in Construction? A vapor barrier is a material that is used to control the flow of water vapor into and out of building materials. It is typically installed in areas where there is a potential for moisture buildup, such as in walls, floors, and ceilings.
Vapor Barriers or Vapor Retarders | Department of Energy
An air barrier/vapor retarder attempts to accomplish water vapor diffusion and air movement control with one material. This type of material is most appropriate for southern climates where keeping humid outdoor air from entering the building cavities is critical during the cooling season.
The Science Behind Vapor Barriers: How They Work
2024年11月15日 · A vapor barrier is a material designed to prevent water vapor from passing through walls, ceilings, and floors, protecting the structure from moisture-related damage. Vapor barriers are typically made from impermeable or low-permeability materials, such as polyethylene sheeting or foil, which block water vapor from entering the building envelope.
The Ultimate Vapor Barrier Guide (Your Top 10 FAQs Answered)
2022年10月23日 · Before installing one in your house, there is a lot to know about vapor barriers, so read on for answers to all your critical FAQs in this ultimate guide. When Should a Vapor Barrier Be Installed? Does Mold Grow Under Crawl Space Vapor Barriers? Should a House Crawl Space Be Vented? Is Tyvek a Vapor Barrier?
What Exactly Is a Vapor Barrier and What Does It Do? - Dragon …
A vapor barrier is a material that helps to prevent vapor from diffusing through building materials. In general, moisture will always flow from an area with a higher concentration to a space with a lower concentration.
What is a vapor barrier, and why is it important? | Northwest ...
A vapor barrier, sometimes referred to as a moisture barrier, is a material designed to restrict the movement of water vapor through the building envelope. When warm air comes into contact with a cold surface, it cools down, and its capacity to hold …
Vapor Barriers | Building Science Education
A vapor barrier, also called a vapor retarder, is a layer in the building envelope that prevents water vapor from entering the wall cavity. There are three different classes of vapor barriers. The class of vapor required depends on the climate zone and cladding type.