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Remember that emissivity and reflectivity both play a part in the surface temperature of a roof. Back to Top Why does a white prepainted metal roof have a much higher emissivity than an unpainted metal roof?

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Remember that emissivity and reflectivity both play a part in the surface temperature of a roof. Back to Top Why does a white prepainted metal roof have a much higher emissivity than an unpainted metal roof?

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The physical characteristics of paint made from organic and inorganic materials are much different than the characteristics of a metallic material. White paint is a better emitter of radiation than bare metal. The controlling characteristic is the surface finish and not the underlying material.

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