##  [Air Barrier Failure](/air-barrier-failure) 

  ##  [Air Barrier Failure](https://engineering.quantumdictionary.io/air-barrier-failure-0) 

  

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**Engineering & Applied Technologies Dictionary**

 







 

 

 

 



 

 

 

 

Definition

Loss of continuity or integrity of the building air barrier system—membranes, membranes-plus‑connections, sheathing layers, or sealed assemblies—resulting in uncontrolled bulk air movement through the building envelope that degrades thermal, moisture and indoor‑air‑quality performance.