1:5:10:365 EcoTip Blog

September 30, 2008

:274 Cool Pavement

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

1:5:10:274 EcoTip: Cool pavement is more reflective so it doesn’t build up as much heat as asphalt. This has the advantage of increasing the amount of light available because it is reflected off of the ground. When light is absorbed by asphalt or other dark surface materials the wavelength changes to heat energy that can contribute to the heat island effect in cities and higher cooling costs for individual buildings. The temperature of asphalt can be as much as 70 degrees F (40 degrees C) hotter than light colored paving.

 

Source: Heat Island Group

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 Additional Information:

Suggested Review: :273

You can learn more about the heat island effect cool roofs and cool pavement from the Heat Island Group  

Tomorrow’s 1:5:10:365 EcoTip is about how cool pavement can also benefit from being pervious.

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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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