Sri Index Roof

It ranges from 0 to 100.

Sri index roof.

Leed 2 2 sustainable sites credit 7 2 states that to receive one point building owners should use a roof with a solar reflective index sri of 78 over at least 75 percent of the roof s surface for roofs with slopes less than 2 12. Sri is measured on a scale from 0 to 100. The sri is a measure of the roof s ability to repel solar heat as shown by a small temperature increase. Berridge s kynar 500 hylar 5000.

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. It defines that the standard black is 0 which is most likely to absorb heat. Solar reflective index sri is important to understand when selecting a highly reflective roof coating that will help lower energy cooling costs. 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. 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. Heat island effect roof. It is defined so that a standard black reflectance 0 05 emittance 0 90 is 0 and a standard white reflectance 0 80 emittance 0 90 is 100.

Solar reflectance index is a measure of a surface s ability to reflect the sun s solar energy solar reflectance and emit heat emissivity. The us department of energy defines the solar reflectance index sri as a measure of the roof s ability to reject solar heat as shown by a small temperature rise. The sri is a calculation method using solar reflectance and thermal emittance values to determine the roof s overall capacity to refuse solar heat. Emissivity is a material s ability to release absorbed energy.

The standard white is 100 which is most likely to reflect heat. Sri is a unit developed by scientists at lawrence berkeley national laboratory. An sri value closer to 0 indicates a darker or black surface and a value closer to 100 indicated a brighter or white surface. Cool metal roof colors are optimal for reducing energy consumption particularly where cooling loads dominate.

Cool roofing products are classified in many cases by their solar reflectance index sri. The solar reflectance index is used for compliance with leed requirements and is calculated according to astm e 1980 using values for reflectance and emissivity. So just what is sri. It stands for solar reflectance index which is a combination of two numbers a material s emissivity a measure of how effectively it rejects heat and reflectivity how much light energy it bounces back.