Energy Efficient and Sustainable Cool Metal Roofing
Considered to be a collective group of sustainable, energy efficient roofing products, cool metal roofing for metal building systems is made up of unpainted and pre-painted metal finishes. "Cool" metal roofing comes in a variety of colours, finishes, profiles and textures for both steep and low slope roofing systems.
The roof has the most impact on the use of energy in any building, including a metal building system or pre-engineered steel building.
The "coolness" of a cool metal roof is measured by the roof's reflectivity and emissivity. Demonstrating with the diagram to the right, when the sun's rays shines on a roof surface, up to 70% of the radiation is reflected off the surface. Less heat is transferred to the building's interior thereby keeping it cooler. So this means that a high reflectivity and emittance value will remain cooler and less heat is transferred into the building, unlike an asphalt shingle roof system.
Metal roof systems for steel buildings from the mill have a very high solar reflectance but also limited in its emittance. To offer the high total solar reflectance and high infrared emittance, a pre-painted organic coating is applied to the metal roof and oven-cured. This gives the roof total solar reflectance and high infrared emittance even with dark colours – almost as high as 90%!
Energy Savings up to 40%
You can save up to 40% in heating and cooling costs because reflective roofs lower cooling loads which helps reduce energy consumption. This was reported by the Laurence Berkeley National Laboratory.
Containing ceramic infrared reflective pigments, ZEUS-SHIELD Roof Panels include Trinar® Cool Chemistry® Series. The pigments are designed to reflect infrared energy while still absorbing visible light energy. This design allows the panels to remain the same colour yet stay much cooler because these painted metal roofs retain 9%% of their reflectance and emittance over time.
End Result
The end result is a strong, sturdy, long-lasting material that reduces energy and helps to alleviate urban heat island (UHI) effects.
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