Should You Invest in a White Roof?


Common sense fashion advice: When the weather’s warm, light colored clothes keep you cool. Recent studies have shown that the same is true for buildings: White roofs and roads reflect heat instead of absorbing it, reducing scorching summer temperatures in cities (cities are hotter than rural areas because of the “heat island effect“)—and possibly even slowing global warming.

The latest white-roofs study used computer simulations to figure out what might happen if every roof in every city of the world were white. The finding: An average temperature reduction of .7 degrees Farenheit. Good news in general, but here’s the problem for homeowners: Since white roofs cool buildings all year round, some people have pointed out that folks with white roofs in northern climates might end up cranking the thermostat higher than their neighbors with dark-colored roofs during winter months.

Roofs of the future might solve this problem: Last year, a team of MIT researchers came up with a prototype of high-tech tiles that change color based on the air temperature. A cool idea for sure, but unfortunately the smart tiles aren’t on the market yet. So till they are, should you spring for a white roof even if you live in the chilly north? Hashem Akbari, a senior scientist and leader of the Heat Island Group at the Lawrence Berkeley National Laboratory, says yes, since AC typically uses a lot more energy than heat. “The wintertime penalties are only a fraction of summer time savings.”

Most of the studies so far are have focused on cities—but Akbari says that white roofs make sense for folks in rural areas and the ‘burbs, too. One thing to keep in mind: Whitewashing your roof won’t cut it—the roof materials themselves have to be white. “Many roofing materials come in an assortment of colors at the same cost,” says Akbari. “One can select a white rather than a dark color.”

DOES IT FEEL LIKE POLITICS IS AT A BREAKING POINT?

Headshot of Editor in Chief of Mother Jones, Clara Jeffery

It sure feels that way to me, and here at Mother Jones, we’ve been thinking a lot about what journalism needs to do differently, and how we can have the biggest impact.

We kept coming back to one word: corruption. Democracy and the rule of law being undermined by those with wealth and power for their own gain. So we're launching an ambitious Mother Jones Corruption Project to do deep, time-intensive reporting on systemic corruption, and asking the MoJo community to help crowdfund it.

We aim to hire, build a team, and give them the time and space needed to understand how we got here and how we might get out. We want to dig into the forces and decisions that have allowed massive conflicts of interest, influence peddling, and win-at-all-costs politics to flourish.

It's unlike anything we've done, and we have seed funding to get started, but we're looking to raise $500,000 from readers by July when we'll be making key budgeting decisions—and the more resources we have by then, the deeper we can dig. If our plan sounds good to you, please help kickstart it with a tax-deductible donation today.

Thanks for reading—whether or not you can pitch in today, or ever, I'm glad you're with us.

Signed by Clara Jeffery

Clara Jeffery, Editor-in-Chief

We Recommend

Latest

Sign up for our newsletters

Subscribe and we'll send Mother Jones straight to your inbox.

Get our award-winning magazine

Save big on a full year of investigations, ideas, and insights.

Subscribe

Support our journalism

Help Mother Jones' reporters dig deep with a tax-deductible donation.

Donate

Share your feedback: We’re planning to launch a new version of the comments section. Help us test it.