1:5:10:365 EcoTip Blog

September 29, 2008

:273 Cool Roofs

Welcome to today’s 1:5:10:365 Tip for becoming a better steward for our home and planet environment.

1:5:10:273 EcoTip: Cool roof is a term used to describe roofs that reflect light instead of becoming hot. According to a paper presented by Lawrence Berkeley National Laboratory scientist Hashem Akbari if every roof and area of pavement in the 100 largest cities in the world was switched to a cool roof and more reflective pavement, the reduced heat would offset 44 metric gigatons of greenhouse gases – an amount greater than all the greenhouse gases emitted by all the countries on our planet each year.

Image reprinted from the Cool Roofs Rating Council Website

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 Additional Information:

In 2005 the state of California required that all flat roofed commercial structures switch to white roofs. The technology has developed such that in 2009 California will require that all new and retrofitted roofs on both residential and commercial structures be heat-reflecting. When properly manufactured even colored roofs can be reflective.

 For additional information see the Los Angles Times September 10, 2008 articleTo slow global warming, install white roofs.

The Cool Roof Rating Council (CRRC) is an independent, non-profit organization that maintains a third-party rating system for radiative properties of roof surfacing materials.  You can use their directory to search for cool roof products.

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1 Comment »

  1. Everybody is aware with the fact that darker materials absorb more heat from sun than white/light colors, but an interesting data I want to share that black surface in the sun can be 40°C (70°F) hotter than the reflective white surface. This phenomenon occurs in the case of roofs also and heated roof then transfer their heat to surrounded air and contribute to heat island effect, while reflective metallic/ ceramic roof can reflect 65-75 %solar light. According to California energy commissioner “White roofs can cut a building’s energy use by 20% and save consumers money,” and “The potential energy savings in the U.S. is in excess of $1 billion annually.”

    http://buildinggreenlife.wordpress.com/2009/08/17/magic-of-white-roofs/

    Comment by ritublog — August 18, 2009 @ 6:11 am


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