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LEED v4.1
New Construction
Sustainable Sites

Heat Island Reduction

LEED CREDIT

NC-v4.1 SSc5: Heat Island Reduction 1-2 points

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View the LEED v4 version of this credit »

SPECIAL REPORT

LEEDuser expert

emily reese moody

LEED AP BD+C, LFA, EcoDistricts AP, ENV SP, Fitwel Ambassador, GGP, GPCP, GCP

Jacobs
Sustainability Director, Certifications & Compliance

SPECIAL REPORT

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Credit language

USGBC logo

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

Requirements

Choose one of the following options:

Option 1. Nonroof and Roof (2 points except Healthcare, 1 point Healthcare)

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. 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. If the device or structure is a roof, it shall have an aged solar reflectance (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 solar reflectance information is not available, it shall have at installation an initial SR of at least 0.33 as measured in accordance with ANSI/CRRC S100.
  • Provide shade with vegetated structures.
  • Use paving materials with an initial solar reflectance (SR) value of at least 0.33.
  • Use an open-grid pavement system (at least 50% unbound).

High-reflectance roof Use roofing materials that have an aged SRI equal to or greater than the values in Table 1. If 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

OR

Aged SRI

Low-sloped roof

≤ 2:12

82

 

64

Steep-sloped roof

> 2:12

39

 

32

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 Install a vegetated roof using native or adapted plant species. 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 an aged SRI of at least 32 (if 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. The credit calculations must include all existing and new off-street parking spaces that are leased or owned by the project, including parking that is outside the project boundary but is used by the project. On-street parking in public rights-of-way is excluded from these calculations.

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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 »

Addenda

7/29/2022Updated: 8/1/2022
Rating System Correction
Description of change:
Revise the second sentence of Option 2 to say the following:

"Any roof used to shade or cover parking must (1) have an aged SRI of at least 32 (if aged SRI information is not available..."
Campus Applicable
No
Internationally Applicable:
No
4/9/2021Updated: 4/20/2021
Rating System Correction
Description of change:
Revise the below SS credit intents as follows:

SSp Construction Activity Pollution Prevention
"To reduce pollution from construction activities by controlling soil erosion, waterway sedimentation, and airborne dust that disproportionately impact frontline communities."

SSc Site Assessment
"To assess site conditions, environmental justice concerns, and cultural and social factors, before design to evaluate sustainable options and inform related decisions about site design."

SSc Rainwater Management
"To reduce runoff volume and improve water quality by replicating the natural hydrology and water balance of the site, based on historical conditions and undeveloped ecosystems in the region to avoid contributing to flooding downstream in frontline communities."

SSc Heat Island Reduction
"To minimize inequitable effects on microclimates and human, especially frontline communities, and wildlife habitats by reducing heat islands."

SSc Places of Respite
"To provide patients, all staff, and visitors with the health benefits of the natural environment by creating outdoor places of respite on the healthcare campus."

SSc Direct Exterior Access
"To provide patients, all staff, and visitors with the health benefits of the natural environment by creating outdoor places of respite on the healthcare campus."
Campus Applicable
No
Internationally Applicable:
No
7/25/2019Updated: 3/1/2021
Rating System Correction
Description of change:
For BD+C, revise language under Table 1 to read as follows. For O+M insert the language below under Table 1.

"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."
Campus Applicable
No
Internationally Applicable:
Yes
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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.

LEEDuser expert

emily reese moody

LEED AP BD+C, LFA, EcoDistricts AP, ENV SP, Fitwel Ambassador, GGP, GPCP, GCP

Jacobs
Sustainability Director, Certifications & Compliance

Get the inside scoop

Our editors have written a detailed analysis of nearly every LEED credit, and LEEDuser premium members get full access. We’ll tell you whether the credit is easy to accomplish or better left alone, and we provide insider tips on how to document it successfully.

USGBC logo

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

Requirements

Choose one of the following options:

Option 1. Nonroof and Roof (2 points except Healthcare, 1 point Healthcare)

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. 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. If the device or structure is a roof, it shall have an aged solar reflectance (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 solar reflectance information is not available, it shall have at installation an initial SR of at least 0.33 as measured in accordance with ANSI/CRRC S100.
  • Provide shade with vegetated structures.
  • Use paving materials with an initial solar reflectance (SR) value of at least 0.33.
  • Use an open-grid pavement system (at least 50% unbound).

High-reflectance roof Use roofing materials that have an aged SRI equal to or greater than the values in Table 1. If 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

OR

Aged SRI

Low-sloped roof

≤ 2:12

82

 

64

Steep-sloped roof

> 2:12

39

 

32

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 Install a vegetated roof using native or adapted plant species. 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 an aged SRI of at least 32 (if 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. The credit calculations must include all existing and new off-street parking spaces that are leased or owned by the project, including parking that is outside the project boundary but is used by the project. On-street parking in public rights-of-way is excluded from these calculations.

In the end, LEED is all about documentation. LEEDuser’s Documentation Toolkit, for premium members only, saves you time and helps you avoid mistakes with:

  • Calculators to help assess credit compliance.
  • Tracking spreadsheets for materials purchases.
  • Spreadsheets and forms to give to subs and other team members.
  • Guidance documents on arcane LEED issues.
  • Sample templates to help guide your narratives and LEED Online submissions.
  • Examples of actual submissions from certified LEED projects.

LEEDuser expert

emily reese moody

LEED AP BD+C, LFA, EcoDistricts AP, ENV SP, Fitwel Ambassador, GGP, GPCP, GCP

Jacobs
Sustainability Director, Certifications & Compliance

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