EcoGeek

White roofs for a green planet

Why did we decide that having roofs be black was a good idea? I know tar is black, and that's what most roofs are sealed with ... but I really can't imagine a much dumber choice.

Sure, black is great in the winter, when the roof becomes a giant solar heat collector. But there's no way to turn that giant solar heat collector off when the summer rolls around. Simply painting roofs white in warm climates decreases air conditioning bills for those buildings by 20 percent. That's one reason why California has required all new buildings to have white roofs for the past few years.

Now there's even more reason to spend the extra dough. If all the roofs in the world were white, enough sunlight would reflect back into the atmosphere to significantly reduce the effects of global warming. Such a simple change, such a massive effect!

This new study says that if the 100 biggest cities painted all their roofs white, and switched their road materials to lighter colors (concrete instead of asphalt) it would reflect enough light and heat back into space to entirely offset the warming of the last few decades.

It's not a true fix for the problem, obviously. For that, we need clean, sustainable energy. But it could buy us enough time to make the changes we truly need.

Via TreeHugger

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comments from our community

Showing 121 - 125 of 125 comments

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  • Posted by Caddy Wed May 27, 2009 2:14pm PDT
    This one new construction house in Hamptons, NY is aluminum ???? Sure is reflextive, hope no pilots go near.
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  • Posted by chris Wed May 27, 2009 2:18pm PDT
    so if we build more recycling plants, there-by using more energy and creating more waste and more stuff to recycle are we not self-perpetuating the process. The same can be said about painting roofs white, tearing off old shingles which must be recycled (into what) causing more use of energy to save energy....duh. How can it possibly have a net positive affect?
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  • Posted by Lyn Wed May 27, 2009 3:08pm PDT
    Many asphalt roofs in the South used to be white, but they "leak" tar in the heat, resulting in sad, dingy, dirty streaked looking roofs. What about the metal roofs? You can paint if you like (although I agree about white glare - horrible) and they last forever. Once again, high upfront costs, but better in the long run... Fire-resistant and the metal is recyclable, unlike all those comp roofs torn off/dumped in landfills every time we have a hail storm.
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  • Posted by raqinc Wed May 27, 2009 3:17pm PDT
    As an installation pro in the roofing industry, I believe a properly vented roof with a radiant barrier system is the most effective solution for residential applications. I do not know the $$$ saving but my customers have the freedom of choice in roof colors as well as green savings. very happy in houston.
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  • Posted by Trick Fri May 29, 2009 1:26pm PDT
    Should I be concerned that my comment is no longer posted on here? It was posted here two days ago. I looked through the complete list 3 times. It was a bit dissenting, but not rude. Any chance it was "censored out" of the conversation? I'm probably just paranoid. :-)
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