“…All four types are used for the purpose of providing a vapour barrier (Anis, Quirouette & Rousseau 2007;CMHS 1982;Currie 2005;Lstiburek 2004Lstiburek , 2007US DOE 2000) and to reduce infiltration losses (Swinton, Brown & Chown 1990). As CSR Building Products was a major sponsor for the project, advice was sought as to the most suitable and most commonly used product.…”