Cool Metal Roofing for pre-engineered steel buildings and metal building systems is a family of sustainable, energy efficient roofing products comprised of unpainted and pre-painted metal finishes. Cool metal roofing is available in a wide variety of finishes, colors, textures and profiles for both steep-slope and low-slope roofing applications.
The roof can have the greatest impact on the energy use of any building, including pre-engineered steel buildings and metal building systems.
Generally,
metal roofing's "coolness" is determined by its reflectivity and
emissivity. As the diagram demonstrates, when solar radiation strikes a
roof surface, some of that radiation - up to 70 percent in the case of
a "cool metal roof" - is reflected off the roof's surface, less heat is
tranferred into the building and the building remains cooler.
Therefore, a roof surface with high reflectivity as well as high
emittance value, such as a "cool metal roof" will remain cooler and
less heat will be transferred into the building or into ambient air
than with a roof surface having low reflectivity, such as a typical
asphalt shingle roof system.
Mill-finish metal roof systems for steel buildings have very high solar reflectance but limited emittance. Metal roofs with oven-cured, pre-painted organic coatings that incorporate new "cool pigment" technology offer high total solar reflectance and high infrared emittance even with dark colors. Emissivity as high as 90% can be achieved for painted metal roofs.
Energy Savings up to 40%
Cool metal roofs help
reduce energy consumption by lowering cooling loads. Reflective roofs
directly save up to 40% in heating and cooling energy costs, as
reported by Laurence Berkeley National Laboratory.
ZEUS-SHIELD Roof Panels are available with TRINAR® COOL CHEMISTRY® Series coatings which contain ceramic infrared reflective pigments. These special pigments are designed to reflect infrared energy while still absorbing visible light energy, thus appearing as the same color yet staying much cooler. Painted metal roofs retain 95% of their initial reflectance and emittance over time.
End Result
The
end result is sustainable building material that can reduce peak energy
demand and help to mitigate urban heat island effects.
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