Vapor retarder for insulated pipe

A method for applying a vapor barrier around an insulated pipe structure having a specific pipe joint having a three-dimensional structure, comprising:

• selecting a prefabricated vapor barrier having a vapor retarder layer, an adhesive layer disposed on one side of the vapor retarder layer, and a release layer covering the adhesive layer, wherein the prefabricated vapor barrier is sized and shaped to have a two-dimensional geometric profile with at least one portion having a same size and shape as at least one corresponding area on an outer surface of the three-dimensional structure of the specific pipe joint when the prefabricated vapor barrier is adhered to the specific pipe joint;
• removing a first portion of the release layer to expose a first portion of the adhesive layer;
• adhering the first portion of the adhesive layer to a first corresponding area on the outer surface of the specific pipe joint;
• removing a second portion of the release layer to expose a second portion of the adhesive layer;
• adhering the second portion of the adhesive layer to a second corresponding area on the outer surface of the specific pipe joint;
• forming an overlap seal in which a first portion of the prefabricated vapor barrier is adhered to itself via a third portion of the adhesive layer;
• and
• forming an edge seal in which a second portion of the prefabricated vapor barrier is adhered to a portion of adjacent insulation structure via one or more of the first, second, and third portions of the adhesive layer.