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Roof Products Key Product Criteria

Equipment Specification
Roofing
  • Low Slope roofs must have an initial solar reflectance of >= 0.65. After 3 years, the solar reflectance must be >= 0.50.
  • Steep Slope roofs must have an initial solar reflectance of >= 0.25. After 3 years, the solar reflectance must be >= 0.15.

Only those roof products that meet the specifications listed in either Table 1 or Table 2, below, may qualify as ENERGY STAR qualified. For roof products that may be applied to either low-slope or steep-slope roofs, such as roof coatings and single-ply membranes, Table 1 contains the applicable ENERGY STAR specifications.

Table 1 — Specifications for ENERGY STAR Qualified Low-Slope Roofs
Characteristic Performance Specification
Energy Efficiency
Initial Solar Reflectance Greater than or equal to 0.65.
Maintenance of Solar Reflectance Greater than or equal to 0.50 three years after installation under normal conditions.
Reliability
Manufacturer warranty for defects in materials and manufacturing Each company's warranty for reflective roof products must be equal in all material respects to the product warranty offered by the same company for comparable non-reflective roof products. A company that sells only reflective roof products must offer a warranty that is equal in all material respects to the standard industry warranty for comparable non-reflective roof products.
Table 2 — Specifications for ENERGY STAR Qualified Steep-Slope Roofs
Characteristic Performance Specification
Energy Efficiency
Initial Solar Reflectance Greater than or equal to 0.25.
Maintenance of Solar Reflectance Greater than or equal to 0.15 three years after installation under normal conditions.
Reliability
Manufacturer warranty for defects in materials and manufacturing Each company's roof product warranty for reflective roof products must be equal in all material respects to the product warranty offered by the same company for comparable non-reflective roof membrane products. A company that sells only reflective roof products must offer a warranty that is equal in all material respects to the standard industry warranty for comparable non-reflective roof products.
Roof Surface:
The uppermost part of the roof system that is in direct contact with solar radiation.
Low-Slope Roofs:
Surfaces with a slope of 2:12 inches or less. (As defined in ASTM Standard E 1918-97).
Steep-Slope Roofs:
Surfaces with a slope greater than 2:12 inches.
Low-Slope Roof Products:
Products that are typically installed on low-slope surfaces such as single-ply membranes, built-up-roofs (BUR), modified bitumen, spray polyurethane foam, roof coatings, and standing-seam profiled metal. Some products that are typically installed on low-slope roofs may also be installed on steep-slope roofs (e.g., single-ply membranes and roof coatings). For the purposes of this Web site, the roof product will constitute the uppermost surface of the building structure.
Steep-Slope Roof Products:
Products that are typically installed on steep-slope surfaces such as composite shingles, clay, concrete, or fiber-cement tile, slate, shakes, architectural profiled metal and individual metal roof components. Some products that are typically installed on low-slope roofs may also be installed on steep-slope roofs (e.g., single-ply membranes and roof coatings). For the purposes of this Web site, the roof product will constitute the uppermost surface of the building structure.
Solar Spectrum:
Radiation originating from the sun, including ultraviolet, visible, and near-infrared radiation. Approximately 99% of solar energy lies between wavelengths of 0.3 to 3.5 micrometers.
Solar Flux:
The direct and diffuse radiation from the sun received at ground level over the solar spectrum expressed in Watts per square meter.
Solar Reflectance:
The fraction of solar flux reflected by a surface expressed as a percent or within the range of 0.00 and 1.00.