weather barrier

Air Barriers and Building Envelope: Why the Invisible Layer Drives Energy Performance and Comfort

Air barriers — the continuous layer that resists air movement through building walls and roofs — affect energy consumption, indoor comfort, moisture management, and envelope durability more than most other envelope decisions. Code requirements (IECC air barrier mandates) have made air barriers standard. Execution quality determines whether the designed performance is actually delivered. Continuous installation with sealed transitions is what separates tight buildings from leaky ones.