It is theorized that dark-coloured roofs can contribute to the urban heat island effect (the temperature in cities is higher than the surrounding unpopulated areas). This theory, based on satellite temperature sensing observations and computer models, suggests that if homeowners replaced their dark shingles or other roof coverings with lighter coloured (more reflective) products, the overall ambient temperature will be reduced, enabling lower cooling costs in the warm summer months. Some reflective roofing products have been listed as “Energy Star qualified”, a program that makes it easy for consumers to identify and purchase energy-efficient products.
Read full article on Canadian Asphalt Shingle Manufacturers’ Association website or view PDF file CASMA_Technical_Bulletin_No_31_-_COOL_ROOFING_IN_CANADIAN_CLIMATES.
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