höyrytiiveystaso
Höyrytiiveystaso is a Finnish term that translates to "vapor barrier level" or "vapor retarder level" in English. It refers to a material or layer within a building's construction assembly that is designed to limit the passage of water vapor from a warmer, more humid space to a colder, drier space. This is crucial for preventing condensation within the building structure, which can lead to moisture damage, mold growth, and reduced thermal performance.
The effectiveness of a vapor barrier is measured by its vapor permeance, often expressed in perms (US
Common materials used as vapor barriers include polyethylene sheeting, asphalt-coated papers, and certain paints or coatings.