Sri Roof Rating

The sri is a calculation method using solar reflectance and thermal emittance values to determine the roof s overall capacity to refuse solar heat.

Sri roof rating.

Roof info has been collecting consumer reviews of shingles since 2009. Sri is a unit developed by scientists at lawrence berkeley national laboratory. According to the manufacturer they quote ornl as saying it does help. In fact this is fairly is common for highly reflective products with high emissivity for example light colored asphaltic membranes like gaf energycap.

Higher sri ratings for shingles mean greater reduction in cooling load on a home. Asphalt roofing shingles with higher sri ratings are cooler in the sunshine. Asphalt shingle products with an energy star rating do not utilize the sri compliance path. These shingles must have an initial solar reflectance of at least 0 25 and a three year solar reflectance measurement of at least 0 15.

Recycled content of berridge metal. 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. The shingles with the highest level of satisfaction appear first lower levels come later in the list. These ratings are presented below.

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. To meet leed requirements a roofing material must have a sri of 29 or higher for steep slope 2 12 roofing and a sri value of 78 or higher for low slope roofing. Solar reflectance is the amount of solar energy or uv rays that is reflected away from the building back into the atmosphere. In addition to a description of what they like and dislike about their shingles homeowners also rate their satisfaction from 5 very satisfied to 1 very unsatisfied.

Metal roof sri ratings. Solar reflective index sri is important to understand when selecting a highly reflective roof coating that will help lower energy cooling costs. Incorporates both solar reflectance and thermal emissivity in a single value. Does having a cool roof help with the r value of roof assembly.