Cool roofing techniques were installed to lower both peak energy demands and electricity costs, while also avoiding future blackouts in the area. Due to excessive demand for energy and an insufficient power supply, rolling blackouts were occurring frequently. It was found that innovations such as vegetated roofs and solar-reflective roofs could lower overall air temperatures in urban areas.Īfter 20 years, these technologies emerged in 2001 in California. More research was also done at the same time to study the impact of light-colored coatings on rooftops. It was found that energy costs decreased when these coatings were used however, this technology was not significant to designers and builders at the time. In the 1980s, research was conducted by the Departments of Energy in California and Tennessee to analyze “solar radiation control coatings” on rooftops. By doing this, cool roofs allow for a more comfortable and controlled indoor environment.Īlthough cool roofing is one of the most significant green technologies today, it is not a new concept. A cool roof prevents heat absorption by reflecting the sun’s heat and then emitting its radiation back into the atmosphere. Cool roofing is an emergent and powerful technology used for temperature control of buildings and areas. In light of this, cool roofing is one of the main strategies used to prevent future occurrences of heat island effects. Research states that average city air temperatures can be up to 5.4 degrees Fahrenheit warmer than their surroundings during the day and up to 22 degrees Fahrenheit warmer during the evenings! "Using Green Roofs to Reduce Heat Islands.One area where this situation is commonly seen is in dense, populated areas such as cities, which have adopted the term “heat islands” due to their drastic temperature increases. "Using Green Roofs to Reduce Heat Islands." (May 9, 2022) "Reducing Urban Heat islands: Compendium of Strategies." June 2014. "Benefits of Single-Ply Roofing Membranes." Jan. "Cost of Modified Bitumen Roof." (May 9, 2022) "Is Ballast Green?" Professional Roofing Magazine. "How Much Does It Cost to Replace A Rubber Roof in 2022?" June 15, 2021. "City of Chicago Recognizes Ballasted EPDM as 'Cool Roof" Alternative." May 29, 2009. "Other Types of Roofing That Can Save Energy." (May 9, 2022) "General Cool Roof and Wall FAQs." (May 9, 2022) "Steep Slope Cool Roofing Systems Increase Energy Efficiency." (May 9, 2022) Asphalt Roofing Manufacturers Association.This typically requires one coat of a reflective material and another of an emissive material that releases heat. Finally, special coatings or pigments can sometimes be added to an existing asphalt surface to convert a standard roof to a cool roof. Another is to apply something called a mineral surfaced cap sheet, which incorporates reflective granules or a reflective coating into the roofing material itself. One is to replace the surface layer with white gravel or reflective marble chips to increase its solar reflectance. Traditionally, the asphalt and surface gravel in a built-up roof have been black or dark gray, trapping much more light and heat than they release, but there are several ways to make a built-up roof cooler. Built-up roofing involves layering a base sheet of asphalt or bitumen with fabric, followed by a protective layer of gravel, mineral granules or some sort of aggregate rock. Because it's inexpensive, easy to apply and easy to repair, it's among the most commonly used roofing systems for flat and low-sloped roofs. Built-up roofing is the term for the standard tar-and-gravel roof.
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