The guide to choosing a cool roof.
Solar reflectance index roofing materials.
Heat island effect roof.
After 3 years the solar reflectance must be 0 15.
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.
Solar reflectance measured in accordance with astm e 903 96 standard test method for solar absorptance reflectance and transmittance of materials using integrating spheres.
Requirements and is calculated according to astm e 1980 using values for reflectance and emissivity.
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.
Cool metal roof colors are optimal for reducing energy consumption particularly where cooling loads dominate.
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.
Furthermore it doesn t store as much thermal energy as an ordinary roof.
Low slope roofs must have an initial solar reflectance of 0 65.
The solar reflectance index or sri is a calculation using the aged solar reflectance and thermal emittance measurements of the asphalt shingles materials.
By lessening the demand for energy it decreases carbon emissions that cause pollution.
Berridge s kynar 500 hylar 5000.
Certainteed corporation has several solar reflective shingles to choose from in various style and color options to suit a range of different home styles and elevations.
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.
Emissivity is a material s ability to release absorbed energy.
After 3 years the solar reflectance must be 0 50.
It ranges from 0 to 100.
To meet leed requirements a roofing material must have a sri of 29 or higher for steep slope 2 12 roofing and a sri value of 78 or higher for low slope roofing.
The lower the sri the hotter a material is likely to become in the sunshine.
Compared to conventional roofing materials of lower reflectance index sri such as zincalume steel and all other roofing materials in the colorbond steel range.
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.
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.
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.
This measurement can be used as an indicator of how hot shingles are likely to become when they re exposed to the sun.
