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Vapour barrier
a layer which reduces or prevents the diffusion of water vapour.

Vapour pressure equalising layer
is a contiguous air layer for balancing on-site originating vapour pressure differences. It is achieved through partial bonding or loose laying of the next layer.

Ventilated roof (formerly known as a "cold roof")
is a roof construction with an upper and a lower frame with an intermediate attic that is ventilated and deaerated from the outside.