Sri Roof Rating

Asphalt shingle products with an energy star rating do not utilize the sri compliance path.

Sri roof rating.

Recycled content of berridge metal. 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. Solar reflective index sri is important to understand when selecting a highly reflective roof coating that will help lower energy cooling costs. Metal roof sri ratings.

According to the manufacturer they quote ornl as saying it does help. 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. 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 a unit developed by scientists at lawrence berkeley national laboratory. 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. In fact this is fairly is common for highly reflective products with high emissivity for example light colored asphaltic membranes like gaf energycap. 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.

The shingles with the highest level of satisfaction appear first lower levels come later in the list. The sri is a calculation method using solar reflectance and thermal emittance values to determine the roof s overall capacity to refuse solar heat. Solar reflectance is the amount of solar energy or uv rays that is reflected away from the building back into the atmosphere. Roof info has been collecting consumer reviews of shingles since 2009.

Solar reflectance index sri. Numbers from 20 to 90 are typical but it s interesting to note that sri can be more than 100. Incorporates both solar reflectance and thermal emissivity in a single value. These ratings are presented below.