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Old 07-02-09, 07:04 PM   #4
TimJFowler
Apprentice EcoRenovator
 
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Join Date: Dec 2008
Location: Santa Fe, NM
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Quote:
Originally Posted by ldjessee View Post
I have heard (not researched, just kind of like rumors) that the new white metal roofs are better for efficiency.
Yes, it's true, light-colored metal "pro-panel" roofs can be MUCH more efficient at reflecting heat than a asphalt shingle roof. The important number to look for is SRI (Solar Reflectance Index) and the higher the number the better.

Quote:
Originally Posted by ldjessee View Post
Is the white metal roof more efficient in both winter and summer? Compared to just dark colored shingles?
Attics should be well insulated to minimize heat loss and/or gain in the home. Given that heat rises, heating your house via a dark roof surface would be very inefficient and very difficult to control at best. A hot attic will heat a home in the summer, accelerate the aging of the roof deck and can cause ice damming and water damage in the winter.

Quote:
Originally Posted by ldjessee View Post
What about noise during heavy rain storms?
There has been no noticeable difference in noise in our home.

Here is some of the research I did on the advantages of a cool roof - Cool Roof: Pro-Panel vs. Asphalt Shingle | EcoNewMexico.com
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