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    The Effect of Reflective Roof Coatings on the Durability of Roofing Systems

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    Based on the knowledge obtained from the Roof Coatings Manufacturers Association (RCMA) sponsored Oak Ridge National Laboratory studies completed in 2000, the RCMA is launching a new long-term durability study. In the original study, preliminary data indicated that reflective coatings retarded the degradation of built-up roofing systems. This part of the study was minimal in scope and incidental to the original test program. As a result this new, more inclusive study is being undertaken.

    In the new study the effect of seven reflective coatings and a control will be determined over four different roofing membranes. The purpose of the study is to determine the long-term effect of the coatings on performance properties of the roofing membrane systems by the applied reflective coatings. The coatings used in the study will be selected from commercially available products. The roofing systems will be exposed in three different geographic regions: the midwest, the southeast and the southwest. The membranes will include a granule surfaced SBS membrane system, a smooth APP membrane system, a standard built-up roof system, and a black, non-reinforced EPDM membrane.

    The reflective roof coatings selected include two types of fibered aluminum coating, one white styrene acrylic elastomeric coating, one white acrylic elastomeric coating, one white solvent based elastomeric coating, one water-based aluminum coating, and a standard fibered black asphalt emulsion coating. The systems will be periodically tested throughout the aging process for a group of physical properties related to performance.

    Concurrent with the outdoor exposure, accelerated aging will be conducted using two conventional weathering techniques. The objective in this part of the study is to determine if there is a correlation between accelerated aging and in-field exposure. The subsequent effect of accelerated weathering on changes in reflectance and emissivity will be determined. The accelerated data will be compared to existing 3-year in-field data to determine if there is a correlation between the accelerated weathering and real time weathering.


    reflective, roof, coatings, durability, aluminum, acrylic, asphalt

    Author Information:

    Mellott, JW
    Vice President, Momentum Technologies, Inc., Uniontown, OH

    Portfolio, DC
    Vice President, PRI Asphalt Technologies, Inc., Tampa, FL

    Committee/Subcommittee: D08.20

    DOI: 10.1520/STP11450S