Forum discussion

NC-2009 SSc7.2:Heat Island Effect—Roof

Emissivity Values are Unknown

I apologize if this is a repeat comment. I tried posting it once before, but when I went back to the forum, I did not see my comment posted. The manufacturers color charts for the roofing we are using do not include a valuefor Emissivity. They do however include SRI and Reflectance values. The credit form requires a value for Emissivity. The Cool Roof Rating Council does not include this specific manufacturer.What am I supposed to do here?

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Fri, 07/31/2015 - 15:08

You can just enter the SRI. The SRI is a product of the emissivity and reflectance. You need to fill in the total roof area to have the percent compliance show up. No need to enter the reflectance and emittance if you've already entered the SRI.

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