Cool Roof Coatings Mat-Su Valley
The Facts
Approximately $40 billion is spent annually in the United States to cool buildings, one-sixth of all energy consumed annually. Black and dark-colored roofing materials can dramatically increase a building's cooling load. Cool Roof Technology - Power Factors - Albany

Energy-efficient roofing systems, also called "cool roofs", can reduce roof temperature by as much as 100°F during the summer, and thereby reduce the building's energy requirements for air conditioning.

Cool roofs reflect the sun's radiant energy before it penetrates into the interior of the building. In fact, reflective materials also help keep the building's neighborhood cool.

Cool Roof Technology - Power Factors - Albany
Solar Reflectance
There are many types of roofing materials with a varying range of reflectance and emittance levels.

Asphalt shingles, the most common type of roofing material, are the least efficient at reflecting the sun's heat energy.
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The asphalt is composed of asphalt-saturated mats made from organic felts or fiberglass.

Roofing granules, one-millimeter sized stones coated with an inorganic silicate material, protect the roof from the sun's ultraviolet light.

The coating contains microscopic pigment particles, similar to those used in paint, to provide color.

Asphalt's low solar reflectance can be attributed to several factors:
Solar Reflectance Index