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The albedo of several types of roofs (lower values means higher temperatures). Reflective surfaces, or ground-based albedo modification (GBAM), is a solar radiation management method of enhancing Earth's albedo (the ability to reflect the visible, infrared, and ultraviolet wavelengths of the Sun, reducing heat transfer to the surface).
This is different from the "cool roof" strategy which reflects solar energy before it heats the roof, but both are a means of reducing radiant heat. According to a study by the Florida Solar Energy Center, [ 8 ] a white tile or white metal cool roof can outperform a traditional black shingle roof with a radiant barrier in the attic, but the ...
On top of the roof, a passive solar hot water system provides nearly all of the house’s hot water, and light-colored shingles reflect heat and save energy. Tim Chapman.
A PDRC installed on a roof in Kolkata exhibited a nearly 4.9 °C (8.8 °F) decrease in surface ground temperatures (with an average reduction of 2.2 °C or 4.0 °F). [9] PDRC surfaces can mitigate extreme heat from the urban heat island effect that occurs in over 450 cities worldwide.
The shingles or slates are nailed directly to the sarking boards without timber battens, providing a strong, wind-resistant roof. An additional layer within a roof that insulates or reflects heat, such as a layer of felt, reflective foil, or polystyrene.
Light-colored roof shingles and reflective paint. Often called cool roofs, these help to keep attics cooler in the summer and in hot climates. To maximize radiative cooling at night, they are often chosen to have high thermal emissivity, whereas their low emissivity for the solar spectrum reflects heat during the day.
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