Heat island reduction

Intent

To minimize effects on microclimates and human and wildlife habitats by reducing heat islands.

Requirements

Choose one of the following options:

Option 1. nonroof and roof (2 points except Healthcare, 1 point Healthcare)

Meet the following criterion:

Alternatively, an SRI and SR weighted average approach may be used to calculate compliance.

Use any combination of the following strategies.

Nonroof measures

• Use the existing plant material or install plants that provide shade over paving areas (including playgrounds) on the site within 10 years of planting.
• Install vegetated planters. Plants must be in place at the time of occupancy permit and cannot include artificial turf.
• Provide shade with structures covered by energy generation systems, such as solar thermal collectors, photovoltaics, and wind turbines.
• 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).

High-reflectance roof
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.

Table 1. Minimum solar reflectance index value, by roof slope

Vegetated roof
Install a vegetated roof.

OR

Option 2. parking under cover (1 point)

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