The sr value is a number from 0 to 1 0.
Sri value of roofing materials.
They have a class a fire rating and can withstand winds of up to 180mph.
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.
It is calculatedi from solar reflectance and thermal emittance values.
Solar reflectance index in the built environment designing buildings wiki share your construction industry knowledge.
Many roofing manufacturers have already obtained independent laboratory testing of the sri of their product catalog.
Solar reflectivity r solar reflectance index sri by color.
The third metric used to measure the performance of cool roof coverings is called the solar reflectance index sri.
The higher the sri the cooler the roof will be.
Leed requires specific sri values for your individual product or material.
Plus their superior aesthetics increase the value of any structure.
Incorporates both solar reflectance and thermal emissivity in a single value.
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.
A value of 0 indicates that the material absorbs all solar energy and a value of 1 0 indicates total reflectance.
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.
In many cases asphalt shingle manufacturers use a shingles third party certified aged sri value to demonstrate compliance with cool roof energy codes.
The higher the value the more heat the material emits.
Solar reflectivity or reflectance is the ability of a material to reflect solar energy from its surface back into the atmosphere.
Solar reflectance index sri is another metric for comparing the coolness of roof surfaces1.
The higher the sri the cooler the roof will be in the sun.
The lower the sri the hotter a material is likely to.
For exampleii a clean black roof could have an sri of 0 while a clean white roof could have an sri of 100.
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.
Te is also measured from 0 to 1.
Cool roofing products are classified in many cases by their solar reflectance index sri.
Concrete tile roofs can also withstand the most severe weather conditions.
Sri as a method for reporting cool roof data will probably take a little while to catch on.
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.
