EBOM-v5 SSc1: Heat Island Reduction 1 point
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Credit language
© Copyright U.S. Green Building Council, Inc. All rights reserved.
Intent
To mitigate disparate impacts on microclimates and habitats caused by heat islands and extreme heat events.
Requirements
Implement strategies to minimize the project’s overall contribution to heat island effects that meet the criteria outlined in Equation 1:
Equation 1. Nonroof and roof calculation
Alternatively, a solar reflectance index (SRI) and solar reflectance (SR) weighted average approach may be used to calculate compliance.
Use any combination of nonroof, high-reflectance roof, and vegetative roof strategies so that the weighted sum of site design strategies is greater than or equal to the sum of the total pavement and roof areas. Each surface may only be counted once, even if it is addressed through multiple strategies.
Nonroof Measures
- Provide shade over pavement areas, measured in plain view at noon, through:
- Plants or vegetated structures that provide shade over paving areas (including playgrounds) on the site. For newly installed plants, base shade area on 10-year canopy.
- Vegetated planters.
- Structures covered by energy generation systems, such as solar thermal collectors, photovoltaics, and wind turbines.
- Architectural devices or structures. If the device or structure is a roof, it shall have an aged SR value of at least 0.28 as measured in accordance with ANSI/CRRC S100. If the device or structure is not a roof, or if aged SR information is not available, it shall have an initial SR of at least 0.33 as measured in accordance with ANSI/CRRC S100.
- Use paving materials with an initial SR value of at least 0.33.
- Create an open-grid pavement system (at least 50% unbound).
High-Reflectance Roof
Use roofing materials that have an aged solar SRI value equal to or greater than the values in Table 1. If an aged SRI is not available, the roofing material shall have an initial SRI equal to or greater than the values in Table 1.
Table 1. Minimum Solar Reflectance Index Value, by Roof Slope
| Slope | Initial SRI | Aged SRI |
Low-sloped roof | ≤ 2:12 | 82 | 64 |
Steep-sloped roof | > 2:12 | 39 | 32 |
A roof area that consists of functional, usable spaces (such as helipads, recreation courts, and similar amenity areas) may meet the requirements of nonroof measures. Applicable roof area excludes roof area covered by mechanical equipment, solar energy panels, skylights, and any other appurtenances.
Vegetated Roof
If newly installed, sufficient growing medium and plant material must be in place to provide full vegetative cover within three years.
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Credit language
© Copyright U.S. Green Building Council, Inc. All rights reserved.
Intent
To mitigate disparate impacts on microclimates and habitats caused by heat islands and extreme heat events.
Requirements
Implement strategies to minimize the project’s overall contribution to heat island effects that meet the criteria outlined in Equation 1:
Equation 1. Nonroof and roof calculation
Alternatively, a solar reflectance index (SRI) and solar reflectance (SR) weighted average approach may be used to calculate compliance.
Use any combination of nonroof, high-reflectance roof, and vegetative roof strategies so that the weighted sum of site design strategies is greater than or equal to the sum of the total pavement and roof areas. Each surface may only be counted once, even if it is addressed through multiple strategies.
Nonroof Measures
- Provide shade over pavement areas, measured in plain view at noon, through:
- Plants or vegetated structures that provide shade over paving areas (including playgrounds) on the site. For newly installed plants, base shade area on 10-year canopy.
- Vegetated planters.
- Structures covered by energy generation systems, such as solar thermal collectors, photovoltaics, and wind turbines.
- Architectural devices or structures. If the device or structure is a roof, it shall have an aged SR value of at least 0.28 as measured in accordance with ANSI/CRRC S100. If the device or structure is not a roof, or if aged SR information is not available, it shall have an initial SR of at least 0.33 as measured in accordance with ANSI/CRRC S100.
- Use paving materials with an initial SR value of at least 0.33.
- Create an open-grid pavement system (at least 50% unbound).
High-Reflectance Roof
Use roofing materials that have an aged solar SRI value equal to or greater than the values in Table 1. If an aged SRI is not available, the roofing material shall have an initial SRI equal to or greater than the values in Table 1.
Table 1. Minimum Solar Reflectance Index Value, by Roof Slope
| Slope | Initial SRI | Aged SRI |
Low-sloped roof | ≤ 2:12 | 82 | 64 |
Steep-sloped roof | > 2:12 | 39 | 32 |
A roof area that consists of functional, usable spaces (such as helipads, recreation courts, and similar amenity areas) may meet the requirements of nonroof measures. Applicable roof area excludes roof area covered by mechanical equipment, solar energy panels, skylights, and any other appurtenances.
Vegetated Roof
If newly installed, sufficient growing medium and plant material must be in place to provide full vegetative cover within three years.