Underwriters Laboratories (UL) Inc. is introducing a new
classification program category for roofing products' radiative
properties. This new UL classification provides product
manufacturers and roofing professionals with a widely recognized
third-party source for testing, reporting and disseminating
products' solar-reflectance and thermal-emittance properties.
In addition to UL's existing certification categories for its
fire, impact and uplift ratings, UL has established a new
category—UL Category Code TGFE, Roof Covering Materials,
Solar Reflectance—addressing surface radiative properties for
low- and steep-slope roofing products. For the purposes of this new
category, low-slope products are defined as those intended for use
at slopes of 2-in-12 (9 degrees) or less; steep-slope products are
those used at slopes greater than 2-in-12 (9 degrees).
Solar-reflectance measurements are made according to ASTM C1549,
"Standard Test Method for Determination of Solar Reflectance Near
Ambient Temperature Using a Portable Solar Reflectometer." Solar
reflectance is identified as the fraction of solar flux reflected
by a material's surface expressed within the range of 0.00 and
1.00. A 0.00 value represents no measured reflectance; a 1.00 value
represents 100 percent...
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