Code Definition

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An Air Barrier, as defined by the National Building Code:

"Air barrier assembly means the combination of air barrier materials and air barrier accessories within the environmental separator that are designed to act as a continuous barrier to the movement of air through the environmental separator."


Plain Language:

  • An air barrier prevents air flow through wall, floor and roof assemblies.
  • Continuous is key
  • Materials like tapes, peel-and-stick membranes, caulking and gaskets are part of the air barrier.
  • Windows and doors are part of the air barrier

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