This credit offers several different compliance paths to choose from, making it a very achievable credit for most projects. It’s common for teams to pursue the reflective materials option for roof and/or hardscapeThe inanimate elements of the building landscaping. It includes pavement, roadways, stonewalls, wood and synthetic decking, concrete paths and sidewalks, and concrete, brick, and tile patios.. Providing parking undercover is another popular option that’s highly achievable for projects that include a parking garage.
Teams also have the option to retain existing shade trees and plant new trees to shade paved areas onsite. Vegetated roofs contribute to this credit as well.
Teams must provide manufacturer documentation or independent testing demonstrating SRI value for roofing material and SR value for nonroof material.
Typical SR values for gray cement concrete, white cement concrete and asphalt concrete can be used for standard nonroof materials per LEED Interpretation #10411.
Cool Roof Rating Council (CRRC) has a searchable product database.
If independent testing is required, page 6 of the Cool Roof Rating Council Standard (CRRC-1) (PDF download) outlines the test methodology and number of tests required for different nonroof materials.
If the top level of your parking structure has parking spaces, it is considered a nonroof surface, and needs to be included in the calculations for Option 1 under “Area of nonroof measures.”
No. USGBC intentionally did not publish standard SRI values for LEED v4. According to USGBC, they found that the values for LEED 2009 were not appropriate for all materials (they were over-generalized), and they actually changed over the years in a couple instances as technologies improved, so they wound up being outdated. Projects should get information from other sources.
To minimize effects on microclimates and human and wildlife habitats by reducing heat islands.
Choose one of the following options:
Meet the following criterion:
Alternatively, an SRIA measure of the constructed surface's ability to stay cool in the sun by reflecting solar radiation and emitting thermal radiation. It is defined such that a standard black surface (initial solar reflectance 0.05, initial thermal emittance 0.90) has an initial SRI of 0, and a standard white surface (initial solar reflectance 0.80, initial thermal emittance 0.90) has an initial SRI of 100. To calculate the SRI for a given material, obtain its solar reflectance and thermal emittance via the Cool Roof Rating Council Standard (CRRC-1). SRI is calculated according to ASTM E 1980. Calculation of the aged SRI is based on the aged tested values of solar reflectance and thermal emittance. and SR weighted average approach may be used to calculate compliance.
Use any combination of the following strategies.
Use roofing materials that have an SRI equal to or greater than the values in Table 1. Meet the three-year aged SRI value. If three-year aged value information is not available, use materials that meet the initial SRI value.
Install a vegetated roof.
Place a minimum of 75% of parking spaces under cover. 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.
This LEED credit (or a component of this credit) has been established as equivalent to a SITES v2 credit or component. For more information on using the equivalency as a substitution in your LEED or SITES project, see this article and guidance document.
There are no comments yet. Start the discussion!
LEED AP ID+C, O+M
LEEDuser is produced by BuildingGreen, Inc., with YR&G authoring most of the original content. LEEDuser enjoys ongoing collaboration with USGBC. Read more about our team
Copyright 2017 – BuildingGreen, Inc.