Sri Value Of Roofing Materials

Many roofing manufacturers have already obtained independent laboratory testing of the sri of their product catalog.

Sri value of roofing materials.

The higher the sri the cooler the roof will be in the sun. Solar reflectance index sri is another metric for comparing the coolness of roof surfaces1. 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. The higher the sri the cooler the roof will be.

The lower the sri value the hotter the asphalt shingles are likely to be in sunlight. They have a class a fire rating and can withstand winds of up to 180mph. Te is also measured from 0 to 1. This measure is calculated from the tsr and te.

Conversely roofing shingles with a higher sri will help reduce the cooling load on your home. For exampleii a clean black roof could have an sri of 0 while a clean white roof could have an sri of 100. Cool roofing products are classified in many cases by their solar reflectance index sri. The lower the sri the hotter a material is likely to.

So just what is sri. Leed requires specific sri values for your individual product or material. The higher the value the more heat the material emits. Your desired roofing or hardscape sri specifications may be readily available in the form of a manufacturer datasheet which can be used as leed documentation.

Incorporates both solar reflectance and thermal emissivity in a single value. Concrete tile roofs can also withstand the most severe weather conditions. It is calculatedi from solar reflectance and thermal emittance values. Solar reflectivity or reflectance is the ability of a material to reflect solar energy from its surface back into the atmosphere.

Sri as a method for reporting cool roof data will probably take a little while to catch on. 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. Solar reflectivity r solar reflectance index sri by color. The sr value is a number from 0 to 1 0.

A value of 0 indicates that the material absorbs all solar energy and a value of 1 0 indicates total reflectance. The third metric used to measure the performance of cool roof coverings is called the solar reflectance index sri. In order to determine the cost of eagle roofing products concrete roof tile contact your local roofing contractor or distributor. Sri measures the roof s ability to reject solar heat defined such that a standard black reflectance 0 05 emittance 0 90 is 0 and a standard white reflectance 0 80 emittance 0 90 is 100.

In many cases asphalt shingle manufacturers use a shingles third party certified aged sri value to demonstrate compliance with cool roof energy codes.