When Is A Vapor Retarder Required?

Vapor Retarder Installation

Good construction practice calls for installing vapor retarders in walls of all new buildings. Local building codes should be followed with regard to the need for vapor retarders in ceilings. When it is convenient to do so, vapor retarders should be installed in existing buildings. In some cases local building codes may conflict with common building practices regarding the use of vapor retarders. Always confer with local building departments before beginning construction.