An air barrier is a system integrated into a building envelope that controls air movement between the conditioned interior and the unconditioned exterior. It reduces air leakage, improves energy efficiency, and supports indoor comfort and air quality.
/ˈɛər ˈbæriər/
An air barrier is a system integrated into a building envelope that controls air movement between the conditioned interior and the unconditioned exterior. It reduces air leakage, improves energy efficiency, and supports indoor comfort and air quality.
What does an air barrier do in a building?
An air barrier limits uncontrolled air leakage through the building envelope. This keeps conditioned air inside, reduces drafts, and improves energy efficiency.
Source: The Cooling Company
Air barriers block leaks to keep conditioned air indoors.
A properly installed air barrier helps keep indoor temperatures stable and reduces HVAC workload, especially in windy or cold climates.
Even small leaks reduce effectiveness, so ensure the air barrier is sealed at all penetrations and junctions.
“Even small leaks reduce effectiveness, so ensure the air barrier is sealed at all penetrations and junctions.”
Historic buildings often lacked air barriers, leading to higher energy use and less consistent comfort.
Is an air barrier the same as a vapor barrier?
No. Air barriers stop airflow, while vapor barriers control moisture diffusion. Some materials can do both, but they serve different purposes.
Where should an air barrier be installed?
Air barriers should be continuous around the building envelope, including walls, rooflines, and around windows, doors, and penetrations.
How do I know if my home needs air sealing?
Drafts, uneven temperatures, and high utility bills often signal air leakage. A professional energy audit can identify problem areas.
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