bob bob
11/5/2009
how does the industry measure the reflective value of metal roofing. the city has an ordinance that states a metal roof can not have a reflectivity factor of 20 percent or greater? Where would one find this?
Todd Miller
Isaiah Industries, Inc.
11/7/2009
The reflectivity ratings you will see on some panels are referencing solar radiation -- their ability to reflect away radiant heat. In that case, higher numbers are good. I think these folks do not want shiny roofs. That is unrelated to solar reflectivity and I do not know of any measurements for it, including the 20% they reference. There is some confusiion afoot with them.
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