Leed Cool Roof Requirements

Cool roof requirements depend on the roof s slope.

Leed cool roof requirements.

202 742 3737 crrc annual membership meeting june 14 2017. The tabs below outline each rating system s requirements and options for seeking the heat island reduction credit. In the earlier leed 2009 requirements cool roofing did not consider aged sri as an option for qualification. A green roof is an ideal way to earn leed credits because it can be something your occupants can take advantage of and use.

1 heat islands are defined as thermal gradient differences between developed and underdeveloped areas. Under new leed version 2 2 requirements approved oct. 31 2005 roofing materials used on low slope roofs with a slope of less than 2 12 must now meet a solar reflectance index sri of 78 while. Under new leed version 2 2 requirements approved oct.

31 2005 roofing materials used on low slope roofs with a slope of less than 2 12 must now meet a solar reflectance index sri of 78 while steep sloped roofs with a slope of more than 2 12 must have an sri of 29. Usgbc leadership in energy and environmental design leed program currently uses minimum sri values of 78 and 29 for low and steep sloped cool roofs respectivelyiii. Check your local energy code regarding the use of cool roof colors. Cool roof savings cool roofs can reduce heat transfer to the indoor environment thereby lowering air conditioning costs.

As shown in table 1 the minimum sri for cool roofing has increased in the newer leed v4. Studies monitoring buildings in california and florida demonstrate that cool roofs save residents and building owners 20 to 70 percent in annual cooling energy use and cool metal roofing can qualify for tax incentives and earn leed credits. Green roofs are another way to turn your roof into a cool roof and lower the heat island effect and can also promote biodiversity for the surrounding environment. Low sloped roofs have a pitch of 9 5 or less 2 12 rise over run.

2 the solar reflectance index is a measure of the constructed surface s ability to reflect solar heat as shown by a small temperature rise it is defined so that a standardblack surface reflectance 0 05 emittance 0 90 is 0 and a standard white surface. Credit values shown on this table reflect those available and do not represent a guarantee of credits to be issued. Leed requirements are based on all materials constructed under the project contract of which metal products are only a portion. When cool roofs are used for the heat island reduction credit the crrc rated products directory can be used to find products that meet the requirements.

Projects seeking leed v4 have the option of qualifying using either initial sri or by obtaining the 3 year aged sri value.