Return to the Home Repair Forum | Post a Follow-Up

 o
Black Roofs versus Light Gray Roofs?

Posted by plumeriavine (My Page) on
Tue, Feb 2, 10 at 17:50

Do black roofs make houses and attics hotter than light colored roofs?


Follow-Up Postings:

 o
RE: Black Roofs versus Light Gray Roofs?

Not enough to worry about if you are considering a black roof for cosmetic reasons. Once the asphalt base is heated, that is what is transfering the heat. Asphalt heats up and holds it. A lighter color is going to reflect some, but a miniscule amount. For a cooler attic, there are materials such as radiant barrier along with proper venting that contribute to a cooler attic.


 o
RE: Black Roofs versus Light Gray Roofs?

radiant barriers - -hmm. That might be good to explore


 o
RE: Black Roofs versus Light Gray Roofs?

In field tests of different roofing materials and attic venting it was found that the only factor that made a significant difference in the temperature of the shingles was the color. The lighter color the cooler the shingles so it's hard to say how effective grey would be.

A radiant barrier will reduce the heat transfer to the attic floor and so will insulation.


 o
RE: Black Roofs versus Light Gray Roofs?

I was looking at Timberline Cool Color Shingles. I haven't seen them in real life yet. Anyone with opinions? Are they a gimmick?
Not sure I want to sacrifice appearance for energy savings. . .

http://www.gaf.com/Roofing/Residential-Roofing/Roofing-Products/Shingles-Styles-Shingle-Colors/Timberline-Shingles/Timberline-Cool-Series-Shingles/Timberline-Cool-Series-Shingles.asp#

Here is a link that might be useful: Cool Series Shingles


 o
RE: Black Roofs versus Light Gray Roofs?

A few random thoughts

The GAF timberline cool colors have a special coating on the granule and will reflect more light. They are produced in limited quanity and cost considerably more so its a wash with the energy rebate.

It cost more to cool a building than to heat it.

Dark colored roofs tend to look better longer - light colors will show stains sooner

light color roofs tend to last longer.

If you have proper insulation and ventilation, the roof color will not impact attic temp that much.

Best color - Weatherwood. It goes with everything and sits in the middle between light & dark.


 o
RE: Black Roofs versus Light Gray Roofs?

Ventilation has little effect on the heat from the underside of a roof because radiant heat energy (infrared) is transmitted through the air without heating it and is then absorbed by the attic floor and the floor then heats the air in the attic. Ventilation helps but it's primary purpose is to help moisture to escape. Excessive ventilation can introduce unwanted moisture.


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Home Repair Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here