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LEED v2009
Neighborhood Development
Green infrastructure & buildings
Heat island reduction

LEED CREDIT

ND-v2009 GIBc9: Heat Island Reduction 1 point

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Credit language

USGBC logo

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

Intent

To reduce heat islands to minimize effects on the microclimate and human and wildlife habitat.

Requirements

Option 1. Nonroof measures

Use any combination of the following strategies for 50% of the nonroof site hardscape (including roads, sidewalks, courtyards, parking lots, parking structures, and driveways):

  1. Provide shade from open structures, such as those supporting solar photovoltaic panels, canopied walkways, and vine pergolas, all with a solar reflectance index (SRI) of at least 29.
  2. Use paving materials with an SRI of at least 29.
  3. Install an open-grid pavement system that is at least 50% pervious.
  4. Provide shade from tree canopy (within ten years of landscape installation).

OR

Option 2. High-reflectance and vegetated roofs

Use roofing materials that have an SRI equal to or greater than the values in Table 1 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 50% 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

Roof slope SRI
Low (≤ 2:12) 78
Steep (> 2:12) 29

OR

Option 3. Mixed nonroof and roof measures

Use any of the strategies listed under Options 1 and 2 that in combination meet the following criterion:

Area of Nonroof Measures
––––––––––––––
0.5
+ Area of SRI Roof
—————
0.75
+ Area of Vegetated Roof
––––––––––––
0.5
Total Site Hardscape Area + Total Roof Area
See all forum discussions about this credit »

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 »

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USGBC logo

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

Intent

To reduce heat islands to minimize effects on the microclimate and human and wildlife habitat.

Requirements

Option 1. Nonroof measures

Use any combination of the following strategies for 50% of the nonroof site hardscape (including roads, sidewalks, courtyards, parking lots, parking structures, and driveways):

  1. Provide shade from open structures, such as those supporting solar photovoltaic panels, canopied walkways, and vine pergolas, all with a solar reflectance index (SRI) of at least 29.
  2. Use paving materials with an SRI of at least 29.
  3. Install an open-grid pavement system that is at least 50% pervious.
  4. Provide shade from tree canopy (within ten years of landscape installation).

OR

Option 2. High-reflectance and vegetated roofs

Use roofing materials that have an SRI equal to or greater than the values in Table 1 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 50% 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

Roof slope SRI
Low (≤ 2:12) 78
Steep (> 2:12) 29

OR

Option 3. Mixed nonroof and roof measures

Use any of the strategies listed under Options 1 and 2 that in combination meet the following criterion:

Area of Nonroof Measures
––––––––––––––
0.5
+ Area of SRI Roof
—————
0.75
+ Area of Vegetated Roof
––––––––––––
0.5
Total Site Hardscape Area + Total Roof Area
See all LEEDuser forum discussions about this credit » Subscribe to new discussions about ND-v2009 GIBc9