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v2009 LEED v2009
Retail-NC-v2009Retail – New construction Retail – New construction
SSSustainable Sites Sustainable Sites
SSc7.2Heat island effect - roof Heat island effect - roof

LEED CREDIT

Retail-NC-v2009 SSc7.2: Heat island effect - roof 1 point

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Credit language

USGBC logo

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

Intent

To reduce heat islands1 to minimize impacts on microclimates and human and wildlife habitats.

Requirements

Option 1
Use roofing materials with a solar reflectance index2 (SRI)equal to or greater than the values in the table below for a minimum of 75% of the roof surface. Roofing materials having a lower SRI value than those listed below may be used if the weighted rooftop SRI average meets the following criteria:

Area Roof Meeting Minimum SRI

————————————————

Total Roof Area

x

SRI of Installed Roof

——————————

Required SRI

75%

Alternatively, the following equation may be used to calculate compliance:

[

Area of Roof A

x

SRI of Roof A

———————

Required SRI

]

+

[

Area of Roof B

x

SRI of Roof B

———————

Required SRI

]

+

...

Total Roof Area

0.75

Roof Type

Slope

SRI

Low-sloped roof

≤ 2:12

78

Steep-sloped roof

> 2:12

29

OR

Option 2
Install a vegetated roof that covers at least 50% of the roof area.

OR

Option 3
Install high-albedo and vegetated roof surfaces that, in combination, meet the following criteria:

Area Roof Meeting Minimum SRI

————————————————

0.75

+

Area of Vegetated Roof

——————————

0.5

Total Roof Area

Roof Type

Slope

SRI

Low-sloped roof

≤ 2:12

78

Steep-sloped roof

> 2:12

29

Alternatively, a weighted approach may be used to calculate compliance for multiple materials:
1 Heat islands are defined as thermal gradient differences between developed and underdeveloped areas. 2 The solar reflectance index (SRI) is a measure of the constructed surface's ability to reflect solar heat, as shown by a small temperature rise. It is defined so that a standardblack surface (reflectance 0.05, emittance 0.90) is 0 and a standard white surface (reflectance 0.80, emittance 0.90) is 100. to calculate the SRI for a given material, obtain the reflectance value and emittance value for the material. SRI is calculated according to ASTM E 1980. Reflectance is measured according to ASTM E 903, ASTM E 1918, or ASTM C 1549. Emittance is measured according to ASTM E408 or ASTM C 1371. 3 For the purposes of this credit, under cover parking is defined as parking underground, under deck, under roof, or under a building.
SITES-LEED Equivalency
This LEED credit (or a component of this credit) has been established as equivalent to a SITES v2 credit or component. For more information on using the equivalency as a substitution in your LEED or SITES project, see this article and guidance document.
See all forum discussions about this credit »

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LEEDuser tip sheets, written by our team of LEED experts, fill gaps in knowledge we’ve observed between the LEED Reference Guide, LEED Online, and LEED Interpretations. We update them regularly so that our members get the most relevant guidance for current issues on their projects.

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LEEDuser tip sheets, written by our team of LEED experts, fill gaps in knowledge we’ve observed between the LEED Reference Guide, LEED Online, and LEED Interpretations. We update them regularly so that our members get the most relevant guidance for current issues on their projects.

( does not provide premium access to LEEDuser)

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LEEDuser tip sheets, written by our team of LEED experts, fill gaps in knowledge we’ve observed between the LEED Reference Guide, LEED Online, and LEED Interpretations. We update them regularly so that our members get the most relevant guidance for current issues on their projects.

( does not provide premium access to LEEDuser)

Go premium for just $19.95 » Go premium for just $15.95 » Firm or campus members – click here »

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USGBC logo

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

Intent

To reduce heat islands1 to minimize impacts on microclimates and human and wildlife habitats.

Requirements

Option 1
Use roofing materials with a solar reflectance index2 (SRI)equal to or greater than the values in the table below for a minimum of 75% of the roof surface. Roofing materials having a lower SRI value than those listed below may be used if the weighted rooftop SRI average meets the following criteria:

Area Roof Meeting Minimum SRI

————————————————

Total Roof Area

x

SRI of Installed Roof

——————————

Required SRI

75%

Alternatively, the following equation may be used to calculate compliance:

[

Area of Roof A

x

SRI of Roof A

———————

Required SRI

]

+

[

Area of Roof B

x

SRI of Roof B

———————

Required SRI

]

+

...

Total Roof Area

0.75

Roof Type

Slope

SRI

Low-sloped roof

≤ 2:12

78

Steep-sloped roof

> 2:12

29

OR

Option 2
Install a vegetated roof that covers at least 50% of the roof area.

OR

Option 3
Install high-albedo and vegetated roof surfaces that, in combination, meet the following criteria:

Area Roof Meeting Minimum SRI

————————————————

0.75

+

Area of Vegetated Roof

——————————

0.5

Total Roof Area

Roof Type

Slope

SRI

Low-sloped roof

≤ 2:12

78

Steep-sloped roof

> 2:12

29

Alternatively, a weighted approach may be used to calculate compliance for multiple materials:
1 Heat islands are defined as thermal gradient differences between developed and underdeveloped areas. 2 The solar reflectance index (SRI) is a measure of the constructed surface's ability to reflect solar heat, as shown by a small temperature rise. It is defined so that a standardblack surface (reflectance 0.05, emittance 0.90) is 0 and a standard white surface (reflectance 0.80, emittance 0.90) is 100. to calculate the SRI for a given material, obtain the reflectance value and emittance value for the material. SRI is calculated according to ASTM E 1980. Reflectance is measured according to ASTM E 903, ASTM E 1918, or ASTM C 1549. Emittance is measured according to ASTM E408 or ASTM C 1371. 3 For the purposes of this credit, under cover parking is defined as parking underground, under deck, under roof, or under a building.
SITES-LEED Equivalency
This LEED credit (or a component of this credit) has been established as equivalent to a SITES v2 credit or component. For more information on using the equivalency as a substitution in your LEED or SITES project, see this article and guidance document.
See all LEEDuser forum discussions about this credit » Subscribe to new discussions about Retail-NC-v2009 SSc7.2