Am I right by saying,
Air barrier - prevents air leakage, so prevents air from going through, but we want it to be breathable - so it will allow vapor to pass through
Vapor barrier - prevent vapor and air from passing through
so say for a cold climate, we put vapor barrier on the inside of the insulation, to prevent air and vapor from going through the wall. However, if vapor does get through ( no barrier is 0 perm) it can still escape to the outside by going through the air barrier ( as it should be breathable and allows air to go through)?
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