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COOL METAL ROOFING

Going Green

METAL ROOFING ~ Cool & Sustainable

Builders and architects are changing the way they select building materials and design for energy performance. The roof can have the greatest impact on the energy use of a building. All of Metal Martís Kynar 500ģ Finishes qualify as a recognized cool roof product.

Buildings consume 1/3 of all energy and 2/3 of all electricity generated. Cool roofs can can help reduce energy consumption by lowering cooling loads. Lightly colored, more reflective roofs save up to 40% in cooling energy, as reported by the Heat Island Group of Lawrence Berkeley National Laboratory. Highly emissive roofs can lower urban air temperatures, thereby benefiting the environment by reducing smog formation.

Metal roofing has many attractive features. Its architectural appeal, texture, color, flexibility, and durability make it popular for residential and commercial projects, both in low-slope and steep-slope applications. Metal roofing and its finishes are inert, safe materials that donít pose a health risk. Metal roofing is tested for wind, fire, and hail resistance, and is listed with various building codes and entities. Its non-combustibility can reduce the spread of fire in and among buildings.

METAL ROOFING is the choice for a cool roof!
For more information about its energy efficiency, visit
www.coolmetalroofing.org

Energy Efficiency

A buildingís cooling and heating costs can be effectively reduced by insulation under the roof surface. Adding increasing amounts of insulation is not always the best way to save energy. As part of total system design, a Metal Mart cool metal roof can be an economical method for better energy efficiency.

Metal Mart cool metal roofing is available unpainted or with oven-baked paint finishes. This family of roofing can achieve solar reflectance of over 70%. Reflected solar energy allows the roof surface to remain cooler, which means less heat is transferred into the building.

The infrared emittance of a roof is a measure of absorbed solar radiation that is remitted from the roof surface to the sky. Emittance of metal roofing varies with the surface finish. Emittance of painted metal roofing can be as high as 90%.

Where annual cooling loads dominate, a highly reflective and emissive painted metal roof is optimal for reducing energy consumption. Where annual heating loads dominate, an unpainted metal roof is more desirable because of itís low emittance.

The Florida Solar Energy Center found that metal roofing...

ď...saves the most energy as a result of itís high reflectance and superior ability to cool quickly at night.Ē

Metal roofing was reported to save a Florida homeowner about 23% annually in cooling costs, compared to a dark gray asphalt shingle roof.

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