Sri Value Of Roofing Materials

Te is also measured from 0 to 1.

Sri value of roofing materials.

Solar reflectivity r solar reflectance index sri by color. So just what is sri. Cool roofing products are classified in many cases by their solar reflectance index sri. In many cases asphalt shingle manufacturers use a shingles third party certified aged sri value to demonstrate compliance with cool roof energy codes.

Incorporates both solar reflectance and thermal emissivity in a single value. The third metric used to measure the performance of cool roof coverings is called the solar reflectance index 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. Solar reflectance index in the built environment designing buildings wiki share your construction industry knowledge.

They have a class a fire rating and can withstand winds of up to 180mph. Solar reflectivity or reflectance is the ability of a material to reflect solar energy from its surface back into the atmosphere. Many roofing manufacturers have already obtained independent laboratory testing of the sri of their product catalog. Sri as a method for reporting cool roof data will probably take a little while to catch on.

It is calculatedi from solar reflectance and thermal emittance values. Plus their superior aesthetics increase the value of any structure. In order to determine the cost of eagle roofing products concrete roof tile contact your local roofing contractor or distributor. The lower the sri the hotter a material is likely to.

A value of 0 indicates that the material absorbs all solar energy and a value of 1 0 indicates total reflectance. Leed requires specific sri values for your individual product or material. 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.

The higher the sri the cooler the roof will be in the sun. 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. The sr value is a number from 0 to 1 0. Most manufacturers still report separate emissivity and reflectivity data in their literature but the cool roof rating council an organization that verifies and labels cool roofing products has begun using the measure while retaining reflectivity and.

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. The higher the value the more heat the material emits. Solar reflectance index sri is another metric for comparing the coolness of roof surfaces1. 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.

The lower the sri value the hotter the asphalt shingles are likely to be in sunlight.