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LEED v4.1
Existing Retail
Sustainable Sites
Heat Island Reduction

LEED CREDIT

Retail-EBOM-v4.1 SSc2: Heat Island Reduction 1 point

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SPECIAL REPORT

Credit achievement rate

XX%

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LEEDuser expert

Jenny Carney

LEED Fellow, RESET AP, Fitwel Ambassador

WSP
Vice President

SPECIAL REPORT

LEEDuser’s viewpoint

Explore this LEED credit

Post your questions on this credit in the forum, and click on the credit language tab to review to the LEED requirements.

Credit language

USGBC logo

© Copyright U.S. Green Building Council, Inc. All rights reserved.

Intent

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

Requirements

Have in place strategies to minimize the project’s overall contribution to heat island effects and that meet the following criterion:

Area of Nonroof Measures   Area of High-Reflectance Roof   Area of Vegetated Roof   Total Site Paving Area   Total Roof Area
———— + —————— + —————— +
0.50   0.75   0.50    

 

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

Use any combination of the following strategies.

Nonroof Measures
  • Plants that provide shade over paving areas (including playgrounds) on the site. For newly installed plants, base shade area on 10-year canopy width at noon.
  • Vegetated planters.
  • Shade with structures covered by energy generation systems, such as solar thermal collectors, photovoltaics, and wind turbines.
  • 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 meet an initial SR of at least 0.33.
  • Shade with vegetated structures.
  • 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, meet an initial SR of at least 0.33.
  • Open-grid pavement system (at least 50% unbound).
High-Reflectance Roof

Roofing materials with an SRI equal to or greater than the values in Table 1. Meet the three-year aged SRI value if available, otherwise, meet the initial SRI value.

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

Slope Initial SRI 3-year aged SRI
Low-sloped roof ≤ 2:12 82 64
Steep-sloped roof > 2:12 39 32
Vegetated Roof

Vegetated roof. If newly installed, sufficient growing medium and plant material must be in place to provide full vegetative cover within 3-years.

Have in place a maintenance program that ensures all high-reflectance surfaces are cleaned at least annually to maintain good reflectance, all vegetation is maintained for plant health, and any vegetated structures or vegetated roofs are maintained for good structural condition.

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What does it cost?

Cost estimates for this credit

On each BD+C v4 credit, LEEDuser offers the wisdom of a team of architects, engineers, cost estimators, and LEED experts with hundreds of LEED projects between then. They analyzed the sustainable design strategies associated with each LEED credit, but also to assign actual costs to those strategies.

Our tab contains overall cost guidance, notes on what “soft costs” to expect, and a strategy-by-strategy breakdown of what to consider and what it might cost, in percentage premiums, actual costs, or both.

This information is also available in a full PDF download in The Cost of LEED v4 report.

Learn more about The Cost of LEED v4 »

Documentation toolkit

The motherlode of cheat sheets

LEEDuser’s Documentation Toolkit is loaded with calculators to help assess credit compliance, tracking spreadsheets for materials, sample templates to help guide your narratives and LEED Online submissions, and examples of actual submissions from certified LEED projects for you to check your work against. To get your plaque, start with the right toolkit.

Credit achievement rate

XX%

Upgrade to LEEDuser Premium to see how many projects achieved this credit. Try it free »

LEEDuser expert

Jenny Carney

LEED Fellow, RESET AP, Fitwel Ambassador

WSP
Vice President

USGBC logo

© Copyright U.S. Green Building Council, Inc. All rights reserved.

Intent

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

Requirements

Have in place strategies to minimize the project’s overall contribution to heat island effects and that meet the following criterion:

Area of Nonroof Measures   Area of High-Reflectance Roof   Area of Vegetated Roof   Total Site Paving Area   Total Roof Area
———— + —————— + —————— +
0.50   0.75   0.50    

 

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

Use any combination of the following strategies.

Nonroof Measures
  • Plants that provide shade over paving areas (including playgrounds) on the site. For newly installed plants, base shade area on 10-year canopy width at noon.
  • Vegetated planters.
  • Shade with structures covered by energy generation systems, such as solar thermal collectors, photovoltaics, and wind turbines.
  • 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 meet an initial SR of at least 0.33.
  • Shade with vegetated structures.
  • 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, meet an initial SR of at least 0.33.
  • Open-grid pavement system (at least 50% unbound).
High-Reflectance Roof

Roofing materials with an SRI equal to or greater than the values in Table 1. Meet the three-year aged SRI value if available, otherwise, meet the initial SRI value.

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

Slope Initial SRI 3-year aged SRI
Low-sloped roof ≤ 2:12 82 64
Steep-sloped roof > 2:12 39 32
Vegetated Roof

Vegetated roof. If newly installed, sufficient growing medium and plant material must be in place to provide full vegetative cover within 3-years.

Have in place a maintenance program that ensures all high-reflectance surfaces are cleaned at least annually to maintain good reflectance, all vegetation is maintained for plant health, and any vegetated structures or vegetated roofs are maintained for good structural condition.

XX%

Upgrade to LEEDuser Premium to see how many projects achieved this credit. Try it free »

LEEDuser expert

Jenny Carney

LEED Fellow, RESET AP, Fitwel Ambassador

WSP
Vice President

See all LEEDuser forum discussions about this credit » Subscribe to new discussions about Retail-EBOM-v4.1 SSc2