October 2002

Updated steep-slope standards | Technology Today

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Updated steep-slope standards

by Mark S. Graham
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ASTM International recently changed its material standards that apply to steep-slope roll-roofing and underlayment products. If you specify, procure or install steep-slope roof systems, I encourage you to become familiar with these changes.

Roll roofing

In 2001, ASTM published a material standard applicable to asphalt-saturated organic felt products commonly used in roll-roofing applications. The standard is designated as ASTM D6380-01, “Standard Specification for Asphalt Roll Roofing (Organic Felt).” (“-01” designates the year of publication; in this case, it is 2001.)

ASTM D6380-01 provides three class designations, Class S, Class M and Class WS, defining smooth-surfaced, mineral granule-surfaced and wide-selvage-edge roll products, respectively. These classes further are divided into types. Classes S and WS include Types III and IV designations, and Class M includes a Type II designation only. These designations differentiate among products within the same class based on products’ minimum net...

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