Air and vapour barriers
What is an air barrier?
...air barrier as being:
1. Continuous: no gaps, cracks or openings.
2. Impermeable to the leakage of air.
3. Rigid: supported in both directions from wind pressure.
4. Durable: must last the life of the building.
5. Repairable: access for repair if damaged.
A sampling of air barrier materials and techniques: ...