Vapour Barrier : A wall or other barrier constructed and placed with the objective of preventing the passage of vapour from any one place to some other place
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}