Solar Reflectance Index Metal Roofing

New technology helps to close the gap between aesthetics and solar reflectance.
Solar reflectance index metal roofing. Requirements and is calculated according to astm e 1980 using values for reflectance and emissivity. 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. Cool metal roofing coated with kynar 500 based resin is one way to limit the urban heat island effect. 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.
Kynar 500 based painted metal roofing can achieve solar reflectance of over 70. Emissivity is a material s ability to release absorbed energy. The guide to choosing a cool roof. Leed requires a roofing material to have a value of 29 or higher for a steep roof pitch 2 12 and 78 or higher for a roof pitch 2 12.
Darker colors like dark brown have an average solar reflectance of 5 9 while white granules have a solar reflectance of 31 3. The solar reflectance index is used for compliance with leed. Also important characteristic to a metal building panel color is the ability of the panel to release absorbed energy called 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.
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. This is called the solar reflectivity index sri. Heat island effect roof. Berridge s kynar 500 hylar 5000.
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. Urban heat island a built environment where the large portion of dark absorbing. Furthermore it doesn t store as much thermal energy as an ordinary roof.
By lessening the demand for energy it decreases carbon emissions that cause pollution. The cool metal roofing paint resin formula formulated by sherwin williams or another paint supplier contains innovative solar reflective pigments which is the key differentiator.