White roofs aka cool roofs are a hot topic these days as a means to help stem global warming.
White rooftops.
White roofs don t absorb as much heat which greatly extends the life of the roofing material.
As a result white rooftops help to reduce the heat loads inside buildings and thus reduce the energy demand for air conditioning.
Painting roofs white or sometimes planting gardens on rooftops has become popular on in places like new york city and chicago.
White rooftops can also be high albedo roofs.
White rooftops in contrast scatter a percentage of visible light back into the atmosphere without converting it into heat energy.
Albedo is the ratio of the amount of.
Most of us know better than to wear black on a hot day but when it comes to the roofs on our.
Can white roofs help cool world s warming cities.
But new research indicates that making surfaces more light reflecting can have a.
Research by the national center for atmospheric research shows that black asphalt roofs raise temperatures 2 4 degrees f and in theory painting roofs white could mitigate that.
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New york city has painted about 7 million square feet of tar rooftops white to lower temperatures.