It is defined so that a standard black surface reflectance 0 05 emittance 0 90 is 0 and a standard white surface reflectance 0 80 emittance 0 90 is 100.
Solar reflectance index roofing materials.
By lessening the demand for energy it decreases carbon emissions that cause pollution.
Only those roof products that meet the specifications.
Berridge metal roofing is cool and sustainable the high reflectivity emissivity and solar reflectance index sri of berridge metal roofing helps mitigate the heat island effect.
This measurement can be used as an indicator of how hot shingles are likely to become when they re exposed to the sun.
Cool metal roof colors are optimal for reducing energy consumption particularly where cooling loads dominate.
Emissivity is a material s ability to release absorbed energy.
The solar reflectance index or sri is a calculation using the aged solar reflectance and thermal emittance measurements of the asphalt shingles materials.
Heat island effect roof.
Furthermore it doesn t store as much thermal energy as an ordinary roof.
After 3 years the solar reflectance must be 0 50.
Compared to conventional roofing materials of lower reflectance index sri such as zincalume steel and all other roofing materials in the colorbond steel range.
Low slope roofs must have an initial solar reflectance of 0 65.
Berridge s kynar 500 hylar 5000.
Solar reflectance measured in accordance with astm e 903 96 standard test method for solar absorptance reflectance and transmittance of materials using integrating spheres.
The solar reflectance index sri is a measure of the constructed surface s ability to reflect solar heat as shown by a small temperature rise.
The requirements apply to new construction and to retrofits or additions that replace or re coat at least 2 000 ft 2 of roof space for nonresidential buildings and 1 000 ft 2 of roof space for.
The guide to choosing a cool roof.
Requirements and is calculated according to astm e 1980 using values for reflectance and emissivity.
Using solar reflective shingles and solar reflective roofing products that reflect ultraviolet and primarily infrared radiation will reduce damage caused by u v and heat degradation.
After 3 years the solar reflectance must be 0 15.
Installing a cool roof can cut your energy costs while contributing toward a better environment.
Steep slope roofs must have an initial solar reflectance of 0 25.
California s building energy efficiency standards for residential and nonresidential buildings title 24 part 6 contains requirements for the thermal emittance three year aged reflectance and solar reflectance index sri of roofing materials used in new construction and re roofing projects.
It ranges from 0 to 100.
The solar reflectance index is used for compliance with leed.
The solar reflectance index sri is a measure of the solar reflectance and emissivity of materials that can be used as an indicator of how hot they are likely to become when solar radiation is incident on their surface.
