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.
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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