In this study, all of the white paints generally exhibit industry acceptable initial solar reflectance index
values, (2) and thus offer varying degrees of potential savings over a black roof baseline.
Green Building Council Solar Reflectance Index
(SRI) of 78 for low-slope and 29 for steep-sloped roofs.
Solar Reflectance Index
(SRI) rating: A measure of the roof's ability to reject solar heat.
The incorporation of native adaptive vegetation and highly efficient irrigation design has reduced landscape water demand by 68% while 22% of the roof area is covered with vegetation and 51% is covered with roofing materials with high SRI value (Solar Reflectance Index
) which reduces heat island effect.
* ASTM E 1980 Standard Practice for Calculating Solar Reflectance Index
of Horizontal and Low-Sloped Opaque Surfaces represents a new term, Solar Reflectance Index
(SRI), which combines both TSR and TE into one value
The resulting value, known as Solar Reflectance Index
(SRI), denotes surface temperature relative to a standard black and standard white surface.
The Cool Roof Rating Council publishes emittance values that can be used in evaluating membranes against the California Energy Code requirements for cool roofing The CRRC also provides a solar reflectance index
that combines reflectance and emittance to simplify comparisons.
Researchers at LBNL have developed a solar reflectance index
, which is the combined value of reflectivity arid emissivity, the measure of a surface's ability to emit its energy in the form of heat radiation.