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    Effect of Moisture on the Strength Characteristics of Built-Up Roofing Felts

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    Stress-strain properties of Type 15 asphalt-saturated, organic, and asbestos felts are compared at room temperature and 50 percent relative humidity. The rate of water sorption by asphalt-saturated organic felt immersed for 520 h in distilled water at room temperature and the effect of moisture on its strength characteristics are assessed. The structure of unsaturated organic felt and the inter-locking characteristics of the fibers were examined by a scanning electron miscroscope.


    roofing, moisture, strength, felts, asphalts

    Author Information:

    Laaly, HO
    Research officer, Building Materials Section, Division of Building Research, National Research Council of Canada, Ottawa, Ont.

    Committee/Subcommittee: D08.03

    DOI: 10.1520/STP27791S