Requirements
Option 1. Nonroof (1 point)
Use any combination of the following strategies for 50% of the nonroof site paving (including roads, sidewalks, courtyards, parking lots, parking structures, and driveways).
- Use the existing plant material or install plants that provide shade over the paving areas on the site within 10 years of plant material installation.
- Install and plant planters, either at grade or raised. Plant material cannot include artificial turf.
- Provide shade with structures covered by energy generation systems, such as solar thermal collectors , photovoltaics, and wind turbines, that produce energy used to offset some nonrenewable resource use.
- Provide shade with architectural devices or structures that have a three-year aged solar reflectance (SR) value of at least 0.28. If three-year aged value information is not available, use materials with an initial SR of at least 0.33 at installation,
- Provide shade with vegetated structures.
- Use paving materials with a three-year aged solar reflectance (SR) value of at least 0.28. If three-year aged value information is not available, use materials with an initial SR of at least 0.33 at installation.
- Use an open-grid pavement system (at least 50% unbound).
OR
Option 2. High-reflectance and vegetated roofs (1 point)
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) for a minimum of 75% of the
roof area of all new buildings within the project, or install a vegetated (“green”) roof for at least 75% of the
roof area of all new buildings within the project. Combinations of
SRI-compliant and vegetated roofs can be used, provided they satisfy the equation in Option 3.
Table 1. Minimum solar reflectance index value, by roof slope
|
Slope |
Initial SRI |
OR |
3-year aged SRI |
Low-sloped roof |
≤ 2:12 |
82 |
|
64 |
Steep-sloped roof |
> 2:12 |
39 |
|
32 |
OR
Option 3. Mixed nonroof and roof measures (1 point)
Use any of the strategies listed under Options 1 and 2 that in combination meet the following criterion:
Area of Nonroof Measures |
|
Area of High-Reflectance Roof |
|
Area of Vegetated Roof |
|
Total Site Paving Area |
|
Total Roof Area |
—————— |
+ |
—————— |
+ |
—————— |
≥ |
+ |
0.5 |
|
0.75 |
|
0.75 |
|
|
Alternatively, an
SRI and SR weighted average approach may be used to calculate compliance.
