Look up: vapour-barrier

1. 
   Vapour Barrier
   An impervious layer, usually heavy gauge polythene sheeting, used to prevent passage of moisture in vulnerable parts of a structure.
   Found on http://www.interbuilders.co.uk/glossary/
   
   
2. 
   Vapour Barrier
   Usually a layer of polythene, Taylor Lane generally use125mu, supplied in rolls which is installed to restrict the passage of water vapour, e.g. on the inside of external wall panels on the warm side of insulation
   Found on http://www.taylor-lane.co.uk/glossary.ph
   
   
3. 
   Vapour barrier
   a protective barrier, usually of polythene or foil-backed plaster board designed to prevent the passage of moisture through a structure thereby eliminating its condensation on cooler surfaces behind. The point where vapour condenses is called the dew point.
   Found on http://www.trp.dundee.ac.uk/research/glo
   
   
4. 
   Vapour barrier
   An installation of polyethylene sheeting, to contain fuel oil vapour originating from the grossly contaminated area and isolates areas not impacted by spilled fuel oil. Typically used in conjunction with vapour recovery/treatment to generate a negative air pressure within the isolated area.
   Found on http://www.dlservicesinc.com/Terminology
   
   
5. 
   vapour Barrier
   In kiln drying, a material with high resistance to vapour movement that is applied to the surfaces of a dry kiln to prevent moisture migration
   Found on http://oak.arch.utas.edu.au/glossary/vie