![]() However, before the specifier can call for a cool roof, he or she needs to understand exactly what it is…and how it works. To stay cool, then, a surface should ideally have both high reflectance and high emittance. Materials with low emittance tend to heat up more easily because they collect and trap heat. Emittance deals with the energy actually absorbed, and is defined as the percentage of energy a material can radiate away. Reflectance, or albedo, is the percentage of solar energy reflected by a surface the higher the percentage, the more energy reflected from the surface. Cool roof systems are typically white or light-colored, and are characterized by levels of reflectance and emittance high enough to help reduce the amount of solar energy retained by a building and potentially transmitted into the structure. When embarking upon a roof resurfacing project for a commercial structure, this technology can be an attractive choice, given its potential savings and positive impact upon the environment. When embarking upon a roof resurfacing project for a commercial structure, this technology can be an attractive choice, given its potential savings and positive impact upon the environment.Ĭool roofing evolved as a means to help keep buildings cooler and make them more energy efficient. For several years, a trend toward energy-efficient roof technology has been emerging in design and construction circles.Cool roofing evolved as a means to help keep buildings cooler and make them more energy efficient.
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