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Related Concept
  • vapor barrier, vapor retarder



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    		• Concept:

    vapor barrier classification

    by permeance

    [CGSB vapor retarder classification (permeance: gn/s.m2.Pa)]: Type I: permeance < 15; TypeII: <45 before aging and <60 after aging

    by material:

    * rigid (reinforced plastics, aluminum, stainless steel), mechanically fastened in place and are vapor-sealed at the joints

    * flexible: metal foils, laminated foil and treated papers, coated felts and papers, plastic films or sheet; supplied in roll form or as an integral part of a building material, sealing of joints are required

    * coating: semifluid or mastic; paint, hot melt; basic composition: asphaltic, resinous, or polymeric, with or without pigments and solvents; applied by spray, brush, trowel, roller, dip or mop, or in sheet form.
    Related References



    CRDBER, at CBS, BCEE, ENCS, Concordia,