The high reflectivity emissivity and solar reflectance index sri of berridge metal roofing helps mitigate the heat island effect.
Metal roof solar reflectance index.
Berridge s kynar 500 hylar 5000.
Appearance differs for black aluminum and matte black steel 10 year finish warranty.
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.
Requirements and is calculated according to astm e 1980 using values for reflectance and emissivity.
Steep slope roofs must have an initial solar reflectance of 0 25.
This is called the solar reflectivity index sri.
Emissivity is a material s ability to release absorbed energy.
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 cool roof rating council was created in 1998 to develop accurate and credible methods for evaluating and labeling the solar reflectance and thermal emittance radiative properties of roofing products and to disseminate the information to all interested parties.
Also important characteristic to a metal building panel color is the ability of the panel to release absorbed energy called emissivity.
Emissivity uses astm c1371.
For every 10 increase in roof reflectance heating cooling costs drop 2 cents per square foot per year.
The solar reflectance index is used for compliance with leed.
Reflectivity uses astm c1549.
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.
Berridge metal roofing is cool and sustainable.
Cool metal roof colors are optimal for reducing energy consumption particularly where cooling loads dominate.
For every 1 increment in roof reflectance the surface temperature of the metal roof decreases 1 degree fahrenheit.
Low slope roofs must have an initial solar reflectance of 0 65.
Only those roof products that meet the specifications listed in either table 1 or table 2 below may qualify as energy star qualified.
When a darker color absorbs the solar energy of the sun that heat is transferred back into the interior of the building.
After 3 years the solar reflectance must be 0 50.
The epa energy star guidelines include initial solar reflectance 0 25 for steep slope and 0 65 for low slope weathered solar reflectance 0 15 for steep slope and 0 50 for low slope after three years of normal exposure and a comparable warranty to non reflective roof products.
Energy star performance criteria.
Low gloss low sheen 70 pvdf finish.
Heat island effect roof.
