[Greenbuilding] Metal Roof Colors

[Shawna Henderson]

Check out the work at

http://www.coolroofs.org/links.html

Also, google 'heat island' and 'cool roofs' for more links. There's lots 
of stuff out there.


Cheers


Shawna Henderson
Abri Sustainable Design & Consulting
Halifax, NS


Nadav Malin wrote:

>Hi Leta,
>
>This is one area where technology seems to be 
>providing an opportunity to have your cake and 
>eat it too!
>
>Over the last few years, most (all?) of the metal 
>roof coating manufacturers have started offering 
>coatings that are reflective to sunlight even in 
>darker colors. Here is an excerpt from a short 
>article that I wrote on one such product in 
>Environmental Building News in 2003:
>
>________________________________________________
>PPG Coil and Extrusion Coatings has released a 
>variant of its Duranar® coatings for metal roofs 
>that contains special pigments to reduce solar 
>gain. With these new "Duranar SPF" coatings, 98% 
>of PPG's standard colors meet the EPA Energy Star 
>steep-roof threshold of 25% total solar 
>reflectivity, whereas with standard Duranar 
>coatings about half of the medium and dark colors 
>do not meet the threshold.
>
>Increased reflectivity is achieved by using 
>pigments that are highly reflective in the 
>nonvisible, infrared portion of the solar 
>spectrum. The use of "SPF" in the product name is 
>a reference to the sun-protection factor ratings 
>for sunscreen. Interestingly, the reflective 
>pigments affect some colors' ratings 
>dramatically, others more modestly, and in some 
>colors they do not affect reflectivity at all.
>________________________________________________
>
>Nadav
>
>
>
>At 9:27 AM -0600 10/18/06, Leta wrote:
>
>>Does anyone know of any study done that measures the amount of heat gain
>>
>>from different colors of roof? Like how much difference is there between a
>
>>sage green and a charcoal color or rust red roof?
>>
>>We are trying to make the decision of roof color and it is ending up being
>>ascetics verses practicality.
>>
>>Thanks,
>>
>>Leta
>>
>>
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>
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