Wörterbuch (en): Vapour barrier / Moisture barrier / Damp barrier
de: 
Dampfsperre (f) 
fr: 
Pare-vapeur (m) / Barrière de vapeur (f) 
it: 
Barriera al vapore (f) 
es: 
Barrera de vapor (f) 
A component with a defined water vapour diffusion resistance that impedes the diffusion of moisture from the warm indoor air into the thermal insulation of a building so that no harmful condensation forms inside the underlying components.

