A steep sloped roof must have an initial sri of 39 or a three year aged sri of 32.
Leed sri roof.
One way to make a decision is to use the solar roof index sri to evaluate a cool roof.
Emissivity is a material s ability to release absorbed energy.
New construction and major renovation about leed the leed leadership in energy and environmental design green building rating system is a voluntary consensus based market driven program that provides third party verification of high performance energy efficient sustainable.
Buildings can earn a credit for reducing the heat island effect with a high reflectance roof but it depends on the type of roof.
Leadership in energy and environmental design leed is the green building rating system developed by the united states green building council usgbc the intent is to provide a standard certification process that registers buildings constructed with environmental performance efficiency and occupant health.
Green building council s leed 2 2 uses sri as a way to evaluate a cool roof.
Low sloped roofs those below 2 12 and flat roofs must have an average initial albedo of at least 0 65 and steep sloped roofs must have an average initial albedo of 0 25 or more.
For leed v4 in existing buildings low sloped roofs must have an initial sri of 82 or a three year aged sri of 64.
In the earlier leed 2009 requirements cool roofing did not consider aged sri as an option for qualification.
For leed compliance please reference the sri values for the berridge color finishes below.
The environmental protection agency s energy star roof product program www energystar gov has cool roofing specifications for both low sloped and sloped roofs.
Any roof used to shade or cover parking must 1 have a three year aged sri of at least 32 if three year aged value information is not available use materials with an initial sri of at least 39 at installation 2 be a vegetated roof or 3 be covered by energy generation systems such as solar thermal collectors photovoltaics and wind turbines.
Gaf green building playbook for leed v4 updated february 2020 4 gaf green building playbook leed v4 for bd c.
Incorporates both solar reflectance and thermal emissivity in a single value.
Leadership in energy and environmental design.
Solar reflectance index sri.
Projects seeking leed v4 have the option of qualifying using either initial sri or by obtaining the 3 year aged sri value.
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.
Green roofs and leed certification.
Berridge s kynar 500 hylar 5000.
