to reduce the thermal gradient differences between developed and
undeveloped land by implementing the use of highly-reflective or
vegetative roofing surfaces.
Requirements for Certification:
Option 1 - Use roofing materials with an acceptable Solar
Reflectance Index (SRI) for 75% of the roof surface. SRI must be
equal to or greater than 78 for a low-sloped roof (less than 2:12
slope) or 29 for a steep-sloped roof.
Option 2 - Install a vegetated roof for at least 50% of the roof
Option 3 - Use a combination of the strategies above such that:
(SRI Roof compliant area / 0.75) + (Vegetated Roof / 0.5) >=
Total Roof Area.
- Vegetated/Garden Roofs
- Energy Star rated roofing systems
- High reflectivity coatings
- Highly reflective and emissive roofs do not only mean white
roofs. A wide variety of roofing colors and styles meet the minimum
- White membrane roofs are not as good in kitchen/restaurant
applications as they quickly degrade under grease exhaust.
- Confirm roofing cutsheets indicate surface reflectivity and
emissivity to calculate the SRI through ASTM Standard
- Garden roofs may be difficult to permit (due to stormwater
run-off related issues) in jurisdictions where it has not been
- 61% of all California LEED Certified projects achieved this
credit for LEED v2.1.
Additional EDR Resources
Thinking outside the Box
Design Briefs: Design
For Your Climate
E-News for Designers: e-News #24: Heat On A Cool White Roof: The
Energy Efficiency Benefits of Reflective Roofing Materials.