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.
