NC-v4 SSc5: Heat island reduction

  • A menu of heat island reduction options

    This credit offers several different compliance paths to choose from, making it a very achievable credit for most projects. It’s common for teams to pursue the reflective materials option for roof and/or hardscapeHardscape consists of the inanimate elements of the building landscaping. Examples include pavement, roadways, stone walls, concrete paths and sidewalks, and concrete, brick, and tile patios.. Providing parking undercover is another popular option that’s highly achievable for projects that include a parking garage.

    Teams also have the option to retain existing shade trees and plant new trees to shade paved areas onsite. Vegetated roofs contribute to this credit as well.

    What’s New in LEED v4

    • This credit combines the roof and nonroof heat island credits contained in LEED 2009.
    • USGBC now determines credit compliance for nonroof hardscape using SR values instead of SRISolar Reflectance Index (SRI) incorporates solar reflectance and emittance in a single quantitative value representing a material's temperature in the sun relative to standard black or white surfaces. values.
    • High-reflectance and vegetated roof surfaces now have equal weight in performance calculations.
    • USGBC now calculates the shade area from tree canopy after 10 years of landscape installation rather than five years.
    • LEED increased the initial SRI thresholds for roofing material.
    • LEED now factors in the three-year aged SRI values for roofing material for this credit.

    FAQs 

    If the manufacturer cannot provide the SR or SRI values, can standard values be used based on the color of the material?

    Teams must provide manufacturer documentation or independent testing demonstrating SRI value for roofing material and SR value for nonroof material.

    Typical SR values for gray cement concrete, white cement concrete and asphalt concrete can be used for standard nonroof materials per LEED Interpretation #10411.

    Cool Roof Rating Council (CRRC) has a searchable product database.

    If independent testing is required, page 6 of the Cool Roof Rating Council Standard (CRRC-1) (PDF download) outlines the test methodology and number of tests required for different nonroof materials.

    If the top floor of a parking garage includes parking spaces, is it considered a roof or non-roof surface?

    If the top level of your parking structure has parking spaces, it is considered a nonroof surface, and needs to be included in the calculations for Option 1 under “Area of nonroof measures.”

    In LEED v4, are there standard allowed SRI values for things like concrete, as in LEED 2009?

    No. USGBC intentionally did not publish standard SRI values for LEED v4. According to USGBC, they found that the values for LEED 2009 were not appropriate for all materials (they were over-generalized), and they actually changed over the years in a couple instances as technologies improved, so they wound up being outdated. Projects should get information from other sources.

  • SS Credit 5: 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:

    Area of Nonroof Measures   Area of High-Reflectance Roof   Area of Vegetated Roof   Total Site Paving Area   Total Roof AreaRoof area is the area of the uppermost surface of the building which covers enclosed Gross Floor Area, as measured when projected onto a flat, horizontal surface (i.e. as seen in Roof Plan view). ‘Roofs’, or portions of roofs, covering unenclosed areas (e.g. roofs over porches and open covered parking structures) are not included in the areas used to evaluate compliance with SSc7.2, though they may be applicable to SSc7.1.
    —————— + —————— + —————— +
    0.5   0.75   0.75    



    Alternatively, an SRISolar Reflectance Index (SRI) incorporates solar reflectance and emittance in a single quantitative value representing a material's temperature in the sun relative to standard black or white surfaces. 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 reflectanceAlso known as albedo: the fraction of solar energy that is reflected by a surface on a scale of 0 to 1. Black paint has a solar reflectance of 0; white paint (titanium dioxide) has a solar reflectance of 1. The standard technique for its determination uses spectrophotometric measurements, with an integrating sphere to determine the reflectance at each wavelength. The average reflectance is then determined by an averaging process, using a standard solar spectrum, as documented by ASTM Standards E903 and E892 (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 Pavements that consist of loose substrates supported by a grid of a more structurally sound grid or webbing. Pervious concrete and porous asphalt are not considered open grid as they are considered bounded materials. Unbounded, loose substrates do not transfer and store heat like bound and compacted materials do.(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

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



    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.

    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.

Design Submittal

PencilDocumentation for this credit can be part of a Design Phase submittal.

32 Comments

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Edgar Arevalo
Jan 17 2017
Guest
45 Thumbs Up

Garbage Truck Maintenance Garage

Project Location: United States

Even though the vehicles parked inside the garage are garbage trucks and not vehicles used by FTEFull-time equivalent (FTE) represents a regular building occupant who spends 8 hours a day (40 hours a week) in the project building. Part-time or overtime occupants have FTE values based on their hours per day divided by 8 (or hours per week divided by 40). Transient Occupants can be reported as either daily totals or as part of the FTE.

Residential occupancy should be estimated based on the number and size of units. Core and Shell projects should refer to the default occupancy table in the Reference Guide appendix.

All occupant assumptions must be consistent across all credits in all categories.
employees, can I still consider those parking spaces for Option 2?

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Summer Minchew LEED AP ID+C, O+M , Ecoimpact Consulting Jan 17 2017 LEEDuser Expert 293 Thumbs Up

I think a vehicle maintenance garage does not meet the intent of the credit.

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Tristan Roberts LEED AP BD+C, Executive Editor – LEEDuser, BuildingGreen, Inc. Jan 17 2017 LEEDuser Moderator

I would agree. This is more like just space that is used for the function of the site, not the kind of parking intended to be addressed by this credit.

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Edgar Arevalo Jan 20 2017 Guest 45 Thumbs Up

Understood. Not to switch to another topic but, by that logic, the project would also not comply with LTc: Reduced Parking FootprintParking footprint refers to the area of the project site occupied by the parking areas and structures. nor LTc: Green Vehicles, correct?

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Juan Carlos Contreras INEDIT
Nov 05 2016
LEEDuser Member
6 Thumbs Up

LEED interpretation ID # 10235

Project Location: Mexico

Hi,

Is the “LEED interpretation ID # 10235” available for a LEED v4 project?

LEED interpretation ID # 10235:
Roof areaRoof area is the area of the uppermost surface of the building which covers enclosed Gross Floor Area, as measured when projected onto a flat, horizontal surface (i.e. as seen in Roof Plan view). ‘Roofs’, or portions of roofs, covering unenclosed areas (e.g. roofs over porches and open covered parking structures) are not included in the areas used to evaluate compliance with SSc7.2, though they may be applicable to SSc7.1. that consists of functional, usable spaces- such as helipads, recreation courts, and areas covered by equipment, solar panels, and appurtenances- can be exempted from the roof calculations for SSc7.2. Projects are not eligible for SSc7.2 if the exempted spaces encompass the entire roof area. Applicable Internationally.

We have a helipad in our project.

Thanks.

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Summer Minchew LEED AP ID+C, O+M , Ecoimpact Consulting Nov 08 2016 LEEDuser Expert 293 Thumbs Up

Great question. LEED ID #10235 does not specifically state applicability to LEED v4 but I think the logic holds. I have asked around and will post a response when received.

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Summer Minchew LEED AP ID+C, O+M , Ecoimpact Consulting Nov 08 2016 LEEDuser Expert 293 Thumbs Up

Juan: I have an update for you. As of now, LEED InterpretationLEED Interpretations are official answers to technical inquiries about implementing LEED on a project. They help people understand how their projects can meet LEED requirements and provide clarity on existing options. LEED Interpretations are to be used by any project certifying under an applicable rating system. All project teams are required to adhere to all LEED Interpretations posted before their registration date. This also applies to other addenda. Adherence to rulings posted after a project registers is optional, but strongly encouraged. LEED Interpretations are published in a searchable database at usgbc.org. 10235 does NOT apply to v4 projects. I believe this is because Heat Island EffectHeat island effect refers to the absorption of heat by hardscapes, such as dark, nonreflective pavement and buildings, and its radiation to surrounding areas. Other sources may include vehicle exhaust, air-conditioners, and street equipment. Reduced airflow because of tall buildings and narrow streets exacerbate the effect. Roof and Non-Roof credits are combined in v4.

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Steven Burke Sustainability Manager SMMA
Sep 16 2016
LEEDuser Member
100 Thumbs Up

Solar Reflectance of Porous Playground Paving Materials

Project Location: United States

The reference guide does specifically mention that playgrounds are one of the non-roof areas that should receive shading, though after the one line where playgrounds are mentioned in parentheses, they don't show up again in the credit language.

I am wondering for my project if the rubber playground surfacing we use, which does have some porosity (though less than 50%) to it and is not a traditional paving material like concrete or asphalt, has to meet the same solar reflectanceAlso known as albedo: the fraction of solar energy that is reflected by a surface on a scale of 0 to 1. Black paint has a solar reflectance of 0; white paint (titanium dioxide) has a solar reflectance of 1. The standard technique for its determination uses spectrophotometric measurements, with an integrating sphere to determine the reflectance at each wavelength. The average reflectance is then determined by an averaging process, using a standard solar spectrum, as documented by ASTM Standards E903 and E892 requirements of other paved surface areas. If anyone has experience please share.

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Summer Minchew LEED AP ID+C, O+M , Ecoimpact Consulting Sep 20 2016 LEEDuser Expert 293 Thumbs Up

Steven: Refer to LEEDUser FAQ for Schools v2009 SSc7.1 Heat Island EffectHeat island effect refers to the absorption of heat by hardscapes, such as dark, nonreflective pavement and buildings, and its radiation to surrounding areas. Other sources may include vehicle exhaust, air-conditioners, and street equipment. Reduced airflow because of tall buildings and narrow streets exacerbate the effect. Non-Roof, "What is HardscapeHardscape consists of the inanimate elements of the building landscaping. Examples include pavement, roadways, stone walls, concrete paths and sidewalks, and concrete, brick, and tile patios.?" For your reference here it is: "According to the LEED Reference Guide, "Hardscape consists of the inanimate elements of the building landscaping. Examples include pavement, roadways, stone walls, concrete paths and sidewalks, and concrete, brick, and tile patios." While this clearly demonstrates that gravel roads and paved tennis courts are hardscape, it leaves some gray area. LEEDuser is not aware of specific guidance relating to marginal surfaces like wood, turf, or pea-gravel, but when in doubt, we recommend considering any 'inanimate" surface hardscape, which would include all of those. This should be seen as an opportunity to meet the credit intent by using high-SRISolar Reflectance Index (SRI) incorporates solar reflectance and emittance in a single quantitative value representing a material's temperature in the sun relative to standard black or white surfaces. materials." Sounds like your playground surface meets the definition of hardscape and should be included in the calculations.

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Jonathan Hickerson Architectural and Brand Strategist EDA Architects
Aug 29 2016
Guest
3 Thumbs Up

Glass skylights and existing roof

Project Location: United States

I have an existing metal standing seam roof that is historic and will remain, and there is a new skylight going in. How do I calculate the heat island impact under LEED v4 New Construction with these two features? Also, do I need to have the existing roof examined to get the actual SRISolar Reflectance Index (SRI) incorporates solar reflectance and emittance in a single quantitative value representing a material's temperature in the sun relative to standard black or white surfaces. from it?

Thanks,

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Summer Minchew LEED AP ID+C, O+M , Ecoimpact Consulting Aug 30 2016 LEEDuser Expert 293 Thumbs Up

Hi Jonathan. You will need to have the existing roof tested to get the actual SRISolar Reflectance Index (SRI) incorporates solar reflectance and emittance in a single quantitative value representing a material's temperature in the sun relative to standard black or white surfaces. value unless you have existing building documentation confirming the manufacturer listed 3 year aged SRI value for the material. The skylight should be excluded per page 200 of the LEED v4 Reference Guide.

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Pam Lynch
Jul 24 2016
Guest
15 Thumbs Up

SRI values and roof slope

Why does a low-slope roof require a higher initial SRISolar Reflectance Index (SRI) incorporates solar reflectance and emittance in a single quantitative value representing a material's temperature in the sun relative to standard black or white surfaces. value over a steep-sloped roof? I'm trying to understand how the SRI requirements are calculated.

Thanks

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Tristan Roberts LEED AP BD+C, Executive Editor – LEEDuser, BuildingGreen, Inc. Jul 29 2016 LEEDuser Moderator

Pam, this requirement is based on the availability of products, as well as issues with reflectivity. If you picture a steep-sloped roof on a house, for example, a white or reflective roof might at the least look out of place, or even cause problems with being too bright. The LEED requirements are flexible on that point.

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Juan Carlos Contreras INEDIT
Jul 19 2016
LEEDuser Member
6 Thumbs Up

SR Natural stone

Project Location: Mexico

Hello,
About the option 1 Nonroof and Roof, we are using a natural Stone (local material), Off-White color, for the pavement in the main square and walkway. But the manufacturer can not provide the SR value for paving and the standard nonroof materials per LEED InterpretationLEED Interpretations are official answers to technical inquiries about implementing LEED on a project. They help people understand how their projects can meet LEED requirements and provide clarity on existing options. LEED Interpretations are to be used by any project certifying under an applicable rating system. All project teams are required to adhere to all LEED Interpretations posted before their registration date. This also applies to other addenda. Adherence to rulings posted after a project registers is optional, but strongly encouraged. LEED Interpretations are published in a searchable database at usgbc.org. 10411 either. Is there another reference about SR which includes this material or we must apply the testing?

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Summer Minchew LEED AP ID+C, O+M , Ecoimpact Consulting Jul 19 2016 LEEDuser Expert 293 Thumbs Up

Hi Juan. You are correct LEED InterpretationLEED Interpretations are official answers to technical inquiries about implementing LEED on a project. They help people understand how their projects can meet LEED requirements and provide clarity on existing options. LEED Interpretations are to be used by any project certifying under an applicable rating system. All project teams are required to adhere to all LEED Interpretations posted before their registration date. This also applies to other addenda. Adherence to rulings posted after a project registers is optional, but strongly encouraged. LEED Interpretations are published in a searchable database at usgbc.org. 10411 only provides typical solar reflectanceAlso known as albedo: the fraction of solar energy that is reflected by a surface on a scale of 0 to 1. Black paint has a solar reflectance of 0; white paint (titanium dioxide) has a solar reflectance of 1. The standard technique for its determination uses spectrophotometric measurements, with an integrating sphere to determine the reflectance at each wavelength. The average reflectance is then determined by an averaging process, using a standard solar spectrum, as documented by ASTM Standards E903 and E892 values for gray cement concrete, white cement concrete and asphalt concrete. Cool Roof Rating Council (CRRC) does have a searchable product database you might try. http://coolroofs.org/products/results

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Francis McNulty OCSC
Apr 12 2016
LEEDuser Member
284 Thumbs Up

SR Values for Paving

Project Location: Ireland

Hi,

Under LEED V4, if the manufacturer can not provide the SR value for paving can we use standard SR values based on the colour of the paving? Or to comply under V4 must we have specific manufacturer information?

Thank you!

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Summer Minchew LEED AP ID+C, O+M , Ecoimpact Consulting Apr 12 2016 LEEDuser Expert 293 Thumbs Up

Under v4 project teams must provide manufacturer documentation or independent testing demonstrating SRISolar Reflectance Index (SRI) incorporates solar reflectance and emittance in a single quantitative value representing a material's temperature in the sun relative to standard black or white surfaces. value for roofing material and SR value for nonroof material.

Typical SR values can be used for standard nonroof materials per LEED InterpretationLEED Interpretations are official answers to technical inquiries about implementing LEED on a project. They help people understand how their projects can meet LEED requirements and provide clarity on existing options. LEED Interpretations are to be used by any project certifying under an applicable rating system. All project teams are required to adhere to all LEED Interpretations posted before their registration date. This also applies to other addenda. Adherence to rulings posted after a project registers is optional, but strongly encouraged. LEED Interpretations are published in a searchable database at usgbc.org. 10411.

If independent testing is required, page 6 of the Cool Roof Rating Council Standard (CRRC-1) (http://coolroofs.org/documents/CRRC-1_Program_Manual_-_2015-11-19_Final.pdf) outlines the test methodology and number of tests required for different nonroof materials.

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Francis McNulty OCSC Apr 26 2016 LEEDuser Member 284 Thumbs Up

HI Summer,

Thank you for your response, however, it has raised further questions for me. If the non-roof materials do not fall under the categories outlined within the LEED InterpretationLEED Interpretations are official answers to technical inquiries about implementing LEED on a project. They help people understand how their projects can meet LEED requirements and provide clarity on existing options. LEED Interpretations are to be used by any project certifying under an applicable rating system. All project teams are required to adhere to all LEED Interpretations posted before their registration date. This also applies to other addenda. Adherence to rulings posted after a project registers is optional, but strongly encouraged. LEED Interpretations are published in a searchable database at usgbc.org. 104411 must we seek manufacturer documentation confirming the SR values? We are having great difficulty in sourcing any SR values from manufacturers.

Under V4 for International projects we can refer to the Cool Roof Council for similar materials however this does not cover non roof materials. Would we be ok to use comparative figures for non-roof materials as was allowed in V3?

Thank you

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Summer Minchew LEED AP ID+C, O+M , Ecoimpact Consulting Apr 26 2016 LEEDuser Expert 293 Thumbs Up

Based on GBCIThe Green Building Certification Institute (GBCI) manages Leadership in Energy and Environmental Design (LEED) building certification and professional accreditation processes. It was established in 2008 with support from the U.S. Green Building Council (USGBC). reviewer comments for a current LEEDv4 project, my understanding is that they are looking for at minimum one of the following: manufacturer documentation of the nonroof material SR value, utilization of the typical SR values for standard nonroof materials per LEED InterpretationLEED Interpretations are official answers to technical inquiries about implementing LEED on a project. They help people understand how their projects can meet LEED requirements and provide clarity on existing options. LEED Interpretations are to be used by any project certifying under an applicable rating system. All project teams are required to adhere to all LEED Interpretations posted before their registration date. This also applies to other addenda. Adherence to rulings posted after a project registers is optional, but strongly encouraged. LEED Interpretations are published in a searchable database at usgbc.org. 10411, or an independent testing report showing the tested SR value. For example, we had our concrete paving material third-party tested and submitted the report to GBCI as documentation. As to your second question, I can't answer that one. But if your project is registered under LEEDv4 you should have been assigned a LEED coach who may be able to assist with international compliance questions.

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Rasita Masalskyte Ms Vesta Consulting
Jan 26 2016
LEEDuser Member
27 Thumbs Up

Top level parking_Option 1

Project Location: Lithuania

Hello,

We're pursuing Option 1. Nonroof and roof.
Questions:
1. Is a top level of multi storey parking garage exempt from Option 1 calculations if it has parking spaces? Or should it be included into the calculations as "nonroof"?
2. If it does have to be included, should it be SRISolar Reflectance Index (SRI) incorporates solar reflectance and emittance in a single quantitative value representing a material's temperature in the sun relative to standard black or white surfaces.-compliant?

LEED v3 says that "if the top level of a parking garage is not covered, it is not considered a roof and is not subject to requirement of having an SRI of at least 29". I wonder if this aligns with LEED v4 Option 1 requirements?

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Ashwini Arun Sustainability Manager, YR&G Jan 26 2016 LEEDuser Expert 199 Thumbs Up

Hi Rasita, have you considered pursuing Option 2 - Parking under Cover, for your project. You can earn this credit if 75% of the parking is in a garage. Also, if you take a look at the "Step by Step Guidance" section in the Reference Guide, there is a note in Step 3 under Option 2. Parking Under Cover (page 201) that uncovered parking on the top level of a multi level structure does not need to meet the requirements of the credit and is considered a nonroof surface.

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Rasita Masalskyte Ms, Vesta Consulting Jan 27 2016 LEEDuser Member 27 Thumbs Up

Thanks Ashwini, but we are aiming at Option 1. Nonroof and roof. because it grants 2 points.
Any comments regarding my previous question about Option 1?

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Ashwini Arun Sustainability Manager, YR&G Jan 27 2016 LEEDuser Expert 199 Thumbs Up

Rasita, if the top level of your parking structure has parking spaces it would be considered a nonroof surface, and needs to be included in the calculations for Option 1 under "Area of Nonroof measures". This is stated in the Reference Guide as well on Page 200 of the "Step by Step Guidance" section. Hope this answers your question.

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Brian Harris Principal TCA Architecture Planning
Dec 11 2015
LEEDuser Member
218 Thumbs Up

Concrete SR Values

Project Location: United States

How are 3 year aged SR values determined for concrete if not available by the manufacturer? And can regular concrete be used which has about a .28 SR value roughly if their is a cleaning program established.

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Trista Little Sustainability Manager, YR&G Dec 14 2015 LEEDuser Expert 5715 Thumbs Up

Hi Brian, the Reference Guide states that if you can't confirm the 3-year SR value you can use materials with an initial SR value of at least 0.33 at installation. This info is in the Requirements section on page 197.

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Radwa Amin LEED specialist Hill International, Africa
Feb 10 2015
LEEDuser Member
269 Thumbs Up

The parking is Under the building

Project Location: Egypt

Hi,
Our project is having the parking in the basement floors, makes it all covered.

My question is about the parking roof; in our case the roof shall be the "ground floor" and won't be able to cover the roof requirements of the credit ( SRISolar Reflectance Index (SRI) incorporates solar reflectance and emittance in a single quantitative value representing a material's temperature in the sun relative to standard black or white surfaces., OR vegetation, Or energy generation coverage).
Can we still be eligible for option 2?

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Kathryn West LEED AP BD+C, O+M, Green Globes Professional, JLL Feb 10 2015 LEEDuser Member 7188 Thumbs Up

LEED InterpretationLEED Interpretations are official answers to technical inquiries about implementing LEED on a project. They help people understand how their projects can meet LEED requirements and provide clarity on existing options. LEED Interpretations are to be used by any project certifying under an applicable rating system. All project teams are required to adhere to all LEED Interpretations posted before their registration date. This also applies to other addenda. Adherence to rulings posted after a project registers is optional, but strongly encouraged. LEED Interpretations are published in a searchable database at usgbc.org. #2391 pertains to this. However, it doesn't say the ruling is applicable to LEEDv4 projects.

The Ruling States:
A parking garage placed under a building can qualify as compliant under SS Credit 7.1 if the appropriate percentage of total parking is located in the garage. Roofs that directly shade parking, such as a carport roof, are subject to the SRISolar Reflectance Index (SRI) incorporates solar reflectance and emittance in a single quantitative value representing a material's temperature in the sun relative to standard black or white surfaces. requirement of 29. However, an SRI requirement does not exist for parking placed underground, under deck, or under a building. Applicable Internationally.

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Jonathan Weiss
Jan 08 2015
LEEDuser Member
2606 Thumbs Up

Option 1 and Option 2?

Project Location: United States

For a project where we're pushing for parking garages for the cars, but have asphalt driveways, can we consider the footprint of the garage as hardscapeHardscape consists of the inanimate elements of the building landscaping. Examples include pavement, roadways, stone walls, concrete paths and sidewalks, and concrete, brick, and tile patios. that meets the requirement? Otherwise we cannot get credit for roofing improvements unless we do both parking garages and concrete roadway surfaces.

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Karin Miller Sustainability Manager, YR&G Apr 16 2015 LEEDuser Member 717 Thumbs Up

Hi Jonathan,

Have you looked at Option 2. Parking Under Cover? If a minimum of 75% of parking spaces are in the garage and the roof used to cover parking has a three-year aged SRISolar Reflectance Index (SRI) incorporates solar reflectance and emittance in a single quantitative value representing a material's temperature in the sun relative to standard black or white surfaces. of at least 32 you should qualify for the credit.

Karin

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LEED Pro Consultant Bioconstruccion & Energia Alternativa
Aug 26 2014
LEEDuser Member
2716 Thumbs Up

SRI value for concrete

Hi,
In LEED v2009 BD+C Sustainable Sites Credit 7.1 there is a table with solar reflectanceAlso known as albedo: the fraction of solar energy that is reflected by a surface on a scale of 0 to 1. Black paint has a solar reflectance of 0; white paint (titanium dioxide) has a solar reflectance of 1. The standard technique for its determination uses spectrophotometric measurements, with an integrating sphere to determine the reflectance at each wavelength. The average reflectance is then determined by an averaging process, using a standard solar spectrum, as documented by ASTM Standards E903 and E892 index for standard paving materials, where the typical new gray concrete is 35.
Are these values acceptable for LEED BD+C v4 or is testing necessary?

Thanks in advance,

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Karin Miller Sustainability Manager, YR&G Apr 16 2015 LEEDuser Member 717 Thumbs Up

Changes from the v2009 requirement indicate that the v2009 table wouldn't be sufficient to demonstrate compliance. The v4 requirement is calculated using the three-year aged SRISolar Reflectance Index (SRI) incorporates solar reflectance and emittance in a single quantitative value representing a material's temperature in the sun relative to standard black or white surfaces. values for roofing material and the SR values instead of SRI values for non roof hardscapeHardscape consists of the inanimate elements of the building landscaping. Examples include pavement, roadways, stone walls, concrete paths and sidewalks, and concrete, brick, and tile patios.. Note that if the three-year aged value information is not available from the manufacturer, projects can meet the roof requirement with an initial SRI value of 82 for Low-sloped roofs or 39 for Steep-sloped roofs.

Your best resource will be the Cool Roof Rating Council standard rated products directory [http://coolroofs.org/] which is listed in the v4 Reference Guide as an acceptable compliance reference if manufacturer information is unavailable.

Hope that helps!

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Brian Harris Principal, TCA Architecture Planning Aug 07 2015 LEEDuser Member 218 Thumbs Up

Thank you Karen, How are 3 year aged SR values determined for concrete? And can regular concrete be used which has about a .28 SR value roughly if their is a cleaning program established.

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