[RE-wrenches] White Roof Temperature

Jerry Shafer jerrysgarage01 at gmail.com
Thu Aug 25 11:10:28 PDT 2022

I did some infrared tests years ago on metal vs comp,vs TPO this along with
color, attic temps. As an example regular comp roof (Dark color non
reflective) in clear sun, gable end vented rafters and plywood temps were
135 degrees and under the modules a foot away was 85 Degrees, so in short
it will not really matter what is under the modules as long as there is
ventilation AKA air gap between the array and the roof, the attic will be
much cooler. As I am sure you all know steel gets colder in the winter then
comp and hotter in the summer but when you shade the roof it basically does
not matter what you are using. I do suggest going into customers' attic
during the day with a IR camera or gun and you can see with good detail the
shade of the modules, even the conduite on the roof, plus the attic temp
being cooler under the modules. In 2017 we tested homes in Honolulu that
were getting a white silicone coating over an asphalt roof, you could see
in the attic where they were coating in real time and the results were
NABCEP PV Inspector

On Thu, Aug 25, 2022 at 10:39 AM Drake Chamberlin via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Hello Wrenches,
> A client installed a beautiful white standing seam roof. Suddenly their
> air conditioning loads dropped way down.
> We were planning to put an array on the roof, but she is concerned that
> the roof would become much hotter with dark colored solar modules over
> it.
> Is there any data on this issue?
> Thank you,
> Drake
> Drake Chamberlin
> Athens Electric LLC
> Ohio Electrical Contractor’s License 44810
> CO Master Electrician’s License 4526
> NABCEP Certified PV Installation Professional
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