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    New Concepts in the Blistering of Asphalt Shingles

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    This paper discusses some recent concepts regarding the blistering of single-thickness asphalt roofing shingles.

    Attention is concentrated upon the upper layer of stabilized asphalt coating, and it is shown that a correlation exists between the intensity of observable shingle blistering after prolonged test deck exposure and the relative diameters of the air pockets or voids in this coating.

    More particularly, it is shown that the production of large voids of diameters in excess of 220 μ and the percentage of these voids to the total number of voids are critical factors in determining the intensity of blistering.

    Methods of reducing the number of large voids formed in the asphalt coating during the manufacture of shingles are discussed. These are: (1) the use of a relatively coarse mineral stabilizer in the coating; (2) the use of a holding tank after the introduction of mineral stabilizer into the coating; and (3) the use of asphalt in the coating that has been held at an elevated temperature for some time after blowing or oxidation.

    Author Information:

    Knight, R. S.
    Building Products Limited, Montreal,

    Platt, R. B.
    Building Products Limited, Montreal,

    Smith, D. J.
    Building Products Limited, Montreal,

    Committee/Subcommittee: D08.02

    DOI: 10.1520/STP44537S