Boral Pavers Solar Reflectance Index
As urban areas develop, buildings, pavements, and other infrastructure replace open land and vegetation. Surfaces that were once permeable and moist become impermeable and dry. These changes cause urban regions to become warmer than their rural surroundings, forming and "island" of higher temperatures in the landscape. In order to power the collective heat island effect, a measurement of the heat contribution of each surface must be attainable. The solar reflectance index is a value that incorporates both solar reflectance and emittance in a single value to represent a material's temperature in the sun. It is calculated using equations based on previously measured values as laid out in ASTM standard E1980.
Clay segmental pavements can earn a LEED point under Credit 7.1 - Sustainable Sites "Heat Island Effect, Non-Roof". The requirements can be met if materials that stay relatively cooler in sunlight are used on at least half of the site's non-roof impervious surfaces such as roads, sidewalks, courtyards, and parking lots. The material's solar reflectance index must be at least 29 on a scale from black (0) to white (100). Where paved surfaces are required, using materials with a higher SRI will reduce the heat island effect, consequently reducing the demand for air conditioning, improving air and storm water runoff quality, and providing more comfort to people interacting with the space.
Of Boral's nine standard colors, Parquet Tan, Peachtree Avenue, Red and Burgundy surpass the LEED SRI threshold of 29. Following is a list of all Boral paver colors with their respective SRI range:
- Bourbon Street (15-20 SRI)
- Parquet Tan (45-50 SRI)
- Peachtree Avenue (40-45 SRI)
- Red (35-40 SRI)
- Santee Gray (25-30 SRI)
- Burgundy (30-35 SRI)
- Heartland Flashed (20-25 SRI)
- Savannah Brown (25-30 SRI)
- Cape Town (15-20 SRI)
Actual test reports are available upon request.