Sri Roof Rating

Sri is a unit developed by scientists at lawrence berkeley national laboratory.

Sri roof rating.

Recycled content of berridge metal. Higher sri ratings for shingles mean greater reduction in cooling load on a home. Solar reflectance is the amount of solar energy or uv rays that is reflected away from the building back into the atmosphere. 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.

Asphalt roofing shingles with higher sri ratings are cooler in the sunshine. Roof info has been collecting consumer reviews of shingles since 2009. Does having a cool roof help with the r value of roof assembly. 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.

According to the manufacturer they quote ornl as saying it does help. These ratings are presented below. Incorporates both solar reflectance and thermal emissivity in a single value. Solar reflectance index sri.

In fact this is fairly is common for highly reflective products with high emissivity for example light colored asphaltic membranes like gaf energycap. Asphalt shingle products with an energy star rating do not utilize the sri compliance path. 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. Peter l posted in energy efficiency and durability on april 12 2015 09 40am if a cool roof design has a sri of 40 would going for a sri of 54 make that much more of a difference.

The sri is a calculation method using solar reflectance and thermal emittance values to determine the roof s overall capacity to refuse solar heat. The shingles with the highest level of satisfaction appear first lower levels come later in the list. Metal roof sri ratings. 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.