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Painting Roofs White

  1. -Disposal of Left-Over Paint (
      "I’ve been painting the inside of our home and find myself with paintbrushes and rollers filled with latex paint (don’t worry, it’s a zero-VOC paint!). I can either 1) wash out all this paint in the sink, which seems to take forever and makes me worried about the water treatment facility; or 2) throw them away, which, wow, seems horribly wasteful." 08-14

  2. -Study: Climate Effects of Painting Roofs White: Against (
      " 'Cooling your house with white roofs at the expense of [slightly] warming the planet is not a very desirable trade-off,' Jacobson says. 'There are more effective methods of reducing global warming.' "

      "The study, however, did not account for how white roofs might reduce electricity use for cooling, which could help lower temperatures by reducing emissions from power plants." 09-12

  3. -Study: Climate Effects of Painting Roofs White: For (
      " 'If the building is air-conditioned, it's going to be a lot cooler, it can use 10 or 15 per cent less electricity... you also do something in that you change the albedo of the Earth – you make it more reflective," Professor Chu said. Now scientists, led by Professor Hashem Akberi, of Concordia University in Canada, have studied this in detail and found that it can have a significant impact.' "

      "They estimate that a city or town where the roofs and the pavements and roads have light-coloured surfaces can increase their albedo by about 10 per cent, which globally would provide a CO2 offset of between 130 billion and 150 billion tonnes – the same as taking every car in the world off the road for 50 years." 09-12

  1. Global Reflective Cities Effort (Global Cool Cities Alliance)
      "Global Cool Cities Alliance will accelerate a world-wide transition to highly reflective, cooler, healthier cities. Its mission is to advance policies and programs that increase the solar reflectance of our buildings and pavements to promote cool buildings, cool cities, and, most importantly, to mitigate the effects of climate change through global cooling." 09-12

  2. Unintended Consequences of Painting Roofs White (
      "Obama’s Energy Secretary Steven Chu once pitched painting roofs white as a solution to global warming. Maybe, but new research finds that there are unintended consequences: reduction of rainfall in the Southwest U.S."

      "Researchers from Arizona State University have found that 'warming resulting from megapolitan expansion is seasonally dependent, with greatest warming occurring during summer and least during winter. Among the most practical ways to combat urbanization-induced warming – the painting of buildings’ roofs white – was found to disrupt regional hydroclimate, highlighting the need for evaluation of tradeoffs associated with combating urban heat islands (UHI).' " 09-12

  3. White Roofs for New York City (
      "NYC °CoolRoofs is an exciting collaboration between NYC Service and the NYC Department of Buildings to promote and facilitate the cooling of New York City’s rooftops. Applying a reflective surface to a roof helps reduce cooling costs, cut energy usage and lower greenhouse gas emissions. Join us as we coat New York City rooftops to make a greener, greater New York!" 09-12


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