Product Brochure

14
Building Envelope
A series of interrelated systems designed to provide comfort and safety to the occupants with
a high-degree of energy efficiency
Vapor Retarder
A material that is used to resist the diffusion of moisture through a floor, ceiling or wall of a
building assembly
Smart Vapor Retarder
A vapor retarder material with the ability to change its permeability based on the ambient
humidity condition of its environment
Air-Barrier
A material that is used to manage the air-leakage into and out of a building
Continuous Air-Barrier
An air barrier that is applied in such a manner that it provides a consistent air-barrier across the
entirety of the building envelope that is free from cracks and voids
Infiltration (and
Exfiltration)
The air-leakage through cracks and leaks around windows and doors, and through floors and
walls of the building envelope of any type of building
Perm
A unit of measurement typically used in characterizing the water vapor permeance of materials.
It measures the flow of water vapor through a material
Glossary of Terms