Effect of Embedded Seams on Tested Water Vapor Transport Properties of Low Permeance Materials

    Volume 6, Issue 4 (April 2009)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 3 April 2009

    Page Count: 12


    Indyke, David
    Consultant, Hackettstown, NJ

    Danny, Frank
    Sanofi Pasteur S. A., Swiftwater, PA

    (Received 18 July 2008; accepted 24 February 2009)

    Abstract

    A method based on ASTM E96/E96M-05 is described for testing the comparative effect of seams and closure types on the water vapor transmission properties of low permeance materials typically applied as moisture vapor retarders. The baseline performance of two materials with water vapor permeance values at 23°C around 5 and 50 ng⋅Pa−1⋅s−1⋅m−2 was measured at both 23°C with 50 % relative humidity and 38°C with 90 % relative humidity. Seams and closures of various types were imposed on both materials including simple overlap, C-fold, lap joint closed with double-sided tape, gap covered by single-sided tape, and lap joint closed with sealant. Testing at 23°C with 50 % relative humidity was repeated using seam widths of 20, 40, and 60 mm. Samples with seam widths of 40 mm were additionally tested at 38°C with 90 % relative humidity. The method gave comparative results indicating that tape and sealant closures are the more effective types in limiting leakage and that seam width can have a significant influence on water vapor transmission through the seam.


    Paper ID: JAI102028

    DOI: 10.1520/JAI102028

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    Author
    Title Effect of Embedded Seams on Tested Water Vapor Transport Properties of Low Permeance Materials
    Symposium Second Symposium on Heat-Air-Moisture Transport: Measurements and Implications in Buildings, 2009-04-20
    Committee C16