Leed Roof Sri

The requirement for sri can be met by using concrete rather than asphalt for 50 of all sidewalks parking lots drives and other impervious surfaces.

Leed roof sri.

The environmental protection agency s energy star roof product program www energystar gov has cool roofing specifications for both low sloped and sloped roofs. 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. Cool roof coating products are available for most roof types according to the department of energy. The intent is to provide a standard certification process that registers buildings constructed with environmental performance efficiency and occupant health and well being as primary goals.

Sri is a unit developed by scientists at lawrence berkeley national laboratory. 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. Green roofs and leed certification. As shown in table 1 the minimum sri for cool roofing has increased in the newer leed v4.

In the earlier leed 2009 requirements cool roofing did not consider aged sri as an option for qualification. Recycled content of berridge metal. 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. Leadership in energy and environmental design leed is the green building rating system developed by the united states green building council usgbc.

A steep sloped roof must have an initial sri of 39 or a three year aged sri of 32. This credit is worth 1 point. Emissivity is a material s ability to release absorbed energy. Leadership in energy and environmental design.

For leed v4 in existing buildings low sloped roofs must have an initial sri of 82 or a three year aged sri of 64. Under roof or under building. Projects seeking leed v4 have the option of qualifying using either initial sri or by obtaining the 3 year aged sri value. Concrete is typically the material of choice for parking structures.