Attic ventilation is:Attic ventilation is the flow of outside air through the space at the underside of the deck of an asphalt shingle roof system. The proper ventilation of this space is a critical design and performance consideration. The benefits of proper ventilation include:Ventilation moves heat out
Read more →Introduction The application of any type of bituminous roofing system in cold weather poses special challenges. Specific to built-up roofing systems, these challenges can include maintaining the proper asphalt temperature at the point of application, slower cure time of cold-applied adhesives, and increased stiffness of roofing materials.
Read more →The formation of a “tobacco juice” residue, so named for its color, has been widely attributed to the weathering of asphalt roofing (i.e., roof coatings, base and cap sheets, and shingles – to name a few) or the exudation of asphalt fractions from the roofing material. In
Read more →While volatile organic compound (VOC) regulations have tightened over the years, there continue to be compliant adhesive, cement, primer, and coating options available for the installation and maintenance of asphalt roofing systems. Asphalt roofing systems—installed and maintained with VOC-compliant adhesives, cements, primers, and coatings—continue to provide long-term
Read more →Asphalt shingles have been used successfully in cold climates for over one hundred years. Improved application efficiency, and more importantly, enhanced long-term shingle performance, can be achieved by following the cold weather application recommendations outlined below: Be sure to follow the manufacturer’s installation instructions carefully, as most
Read more →ASTM D3462, the Standard Specification for Asphalt Shingles Made from Glass Felt and Surfaced with Mineral Granules, provides that compliance is to be measured at the time of manufacture. Asphalt shingles are complex composite products made by combining materials with significantly different properties. Shingles that are in
Read more →Sampling is the process of selecting material to be tested. The process used for collecting test samples directly affects the conclusions that can be supported by the test results. Statisticians use the term “inference” to describe the extension of test results from a sample to a broader
Read more →Introduction: Moisture content within a roofing assembly may fluctuate significantly over the life of the roof depending on a variety of factors including, but not limited to moisture in the existing roof assembly at time of installation; interior and exterior temperatures; interior and exterior humidity conditions; deck
Read more →Self-adhering underlayment is generally applied to the roof deck on the eaves, rakes, and valley areas of steep slope roofs and as flashing around roof penetrations. Self-adhering underlayments are installed on critical areas of the roof to minimize the likelihood of water penetrating the roofing system. In
Read more →While properly designed roof systems installed over lightweight structural concrete roof decks have performed successfully, moisture-related complications can be an issue when these roof decks are used as a roof substrate. Higher absorptive properties of aggregates typically used in lightweight structural concrete can result in an elevated
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