What is SRI?

Solar Reflectance Index (SRI): Incorporates both solar reflectance and thermal emissivity in a single value. SRI measures the roof’s ability to reject solar heat. Standard black (reflectance 0.05, emittance 0.90) is 0 and a standard white (reflectance 0.80, emittance 0.90) is 100.

Solar radiation heats up the roof surface. Heat transfer ensues, and some heat absorbed by the roof and transferred into the building. Due to the high Solar Reflectance of Berridge’s Kynar 500®/Hylar 5000® Cool Colors, a percentage of solar radiation is reflected by the roof. Thermal Emissivity is the roof’s relative ability to emit or release the absorbed heat. Some materials release heat faster than others.

The Heat Island Effect happens when ambient temperature outside buildings is heated through convection and conduction and contributes to the significant warmer temperatures in metropolitan areas than in surrounding rural areas.

For steep-slope roofs greater than 2:12, the Berridge colors Almond, Antique Copper-Cote, Champagne, Cityscape, Copper-Cote™, Deep Red, Parchment, Preweathered Galvalume®, Shasta White, Sierra Tan, Zinc-Cote™, Zinc Grey and Acrylic Coated Galvalume® meet or exceed LEED v4 and Energy Star requirements. For low slope roofs less than or equal to 2:12, Natural White meets or exceeds LEED v4 requirements.

The high reflectivity, emissivity and solar reflectance index (SRI) of Berridge metal roofing helps mitigate the heat island effect. Berridge’s Kynar 500®/Hylar 5000® cool metal roof colors are optimal for reducing energy consumption, particularly where cooling loads dominate. For LEED® compliance, reference SRI values for Berridge color finishes below:

Berridge ColorsSolar ReflectanceEmissivitySRI
Aged Bronze0.300.8630
Award Blue0.170.8311
Bristol Blue0.330.8533
Charcoal Grey0.310.8430
Colonial Red0.330.8534
Copper Brown0.300.8529
Dark Bronze0.280.8527
Deep Red0.390.8441
Forest Green0.250.8322
Hartford Green0.280.8326
Hemlock Green0.310.8330
Matte Black0.260.8926
Medium Bronze0.310.8531
Natural White0.760.8493
Patina Green0.340.8636
Royal Blue0.260.8525
Shasta White0.600.8470
Sierra Tan0.390.8542
Teal Green0.270.8727
Zinc Grey0.390.8542
Acrylic Coated Galvalume0.670.2059
Metallic Colors
Antique Copper Cote0.330.8434
Preweathered Galvalume0.400.8543