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