AIR BARRIER CRITERIA
- Impermeable to air
flow
- Installed anywhere in building
envelope assembly
- CONTINUOUS, by
sealing all seams, edges, gaps, holes, etc.
- DURABLE during
construction and for the expected life of building
- Rigid and strong enough to
withstand air-pressure differences
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VAPOUR RETARDER CRITERIA
- Impermeable to moisture
flow
- Installed to the warm side of
the insulation
- Must cover as much surface area
as possible, NOT CONTINUOUS
- DURABLE during
construction and for the expected life of the building
- Not necessarily resistant to air
flow
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