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 hardscapeThe inanimate elements of the building landscaping. It includes pavement, roadways, stonewalls, wood and synthetic decking, 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 SRIA measure of the constructed surface's ability to stay cool in the sun by reflecting solar radiation and emitting thermal radiation. It is defined such that a standard black surface (initial solar reflectance 0.05, initial thermal emittance 0.90) has an initial SRI of 0, and a standard white surface (initial solar reflectance 0.80, initial thermal emittance 0.90) has an initial SRI of 100. To calculate the SRI for a given material, obtain its solar reflectance and thermal emittance via the Cool Roof Rating Council Standard (CRRC-1). SRI is calculated according to ASTM E 1980. Calculation of the aged SRI is based on the aged tested values of solar reflectance and thermal emittance. 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 SRIA measure of the constructed surface's ability to stay cool in the sun by reflecting solar radiation and emitting thermal radiation. It is defined such that a standard black surface (initial solar reflectance 0.05, initial thermal emittance 0.90) has an initial SRI of 0, and a standard white surface (initial solar reflectance 0.80, initial thermal emittance 0.90) has an initial SRI of 100. To calculate the SRI for a given material, obtain its solar reflectance and thermal emittance via the Cool Roof Rating Council Standard (CRRC-1). SRI is calculated according to ASTM E 1980. Calculation of the aged SRI is based on the aged tested values of solar reflectance and thermal emittance. 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.

50 Comments

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emily reese Sustainability Consultant Jacobs
Jun 20 2017
LEEDuser Member
1748 Thumbs Up

less reflective roof surface desireable

Just wondering if anyone has ever had a project that legitimately did not want a highly reflective roof b/c they are in a cold climate and want the heat absorption. What to do?
We have a project in Alaska starting that may argue this point; they are also immediately adjacent to a flight path and thus restricted from using highly reflective materials. I recall this question coming up on a v3 project a long time ago (at least for the heat retention portion), but at the time, USGBC was unwilling to budge.

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Summer Minchew LEED AP ID+C, O+M , Ecoimpact Consulting Jun 22 2017 LEEDuser Expert 371 Thumbs Up

I would suggest, as discussed within the LEED v3 forum on this topic, that not all LEED credits are feasible for all projects. It sounds like the roof component of this credit is not feasible for your project as high SRIA measure of the constructed surface's ability to stay cool in the sun by reflecting solar radiation and emitting thermal radiation. It is defined such that a standard black surface (initial solar reflectance 0.05, initial thermal emittance 0.90) has an initial SRI of 0, and a standard white surface (initial solar reflectance 0.80, initial thermal emittance 0.90) has an initial SRI of 100. To calculate the SRI for a given material, obtain its solar reflectance and thermal emittance via the Cool Roof Rating Council Standard (CRRC-1). SRI is calculated according to ASTM E 1980. Calculation of the aged SRI is based on the aged tested values of solar reflectance and thermal emittance. values indicated within the credit language are prescriptive.

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Irene Chung
Jun 06 2017
LEEDuser Member
3 Thumbs Up

Roof Top Patio

Project Location: Canada

Hello,

1/4 of my project's 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. is going to be patio that is accessible to occupants. Can rooftop patio be excluded? If not, is the minimum initial SRIA measure of the constructed surface's ability to stay cool in the sun by reflecting solar radiation and emitting thermal radiation. It is defined such that a standard black surface (initial solar reflectance 0.05, initial thermal emittance 0.90) has an initial SRI of 0, and a standard white surface (initial solar reflectance 0.80, initial thermal emittance 0.90) has an initial SRI of 100. To calculate the SRI for a given material, obtain its solar reflectance and thermal emittance via the Cool Roof Rating Council Standard (CRRC-1). SRI is calculated according to ASTM E 1980. Calculation of the aged SRI is based on the aged tested values of solar reflectance and thermal emittance. 82 for rooftop patio area?

Thank you.

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Summer Minchew LEED AP ID+C, O+M , Ecoimpact Consulting Jun 07 2017 LEEDuser Expert 371 Thumbs Up

LEED v4 Reference Guide states "applicable 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. excludes roof area covered by mechanical equipment, solar energy panels, skylights, and any other appurtenances." LEED v4 Reference Guide goes on to define appurtenance as "a built-in, nonstructural portion of a roof system, examples include skylights, ventilators, mechanical equipment, partitions, and solar energy panels." You should consider the rooftop patio area as roof material subject to the 82 SRIA measure of the constructed surface's ability to stay cool in the sun by reflecting solar radiation and emitting thermal radiation. It is defined such that a standard black surface (initial solar reflectance 0.05, initial thermal emittance 0.90) has an initial SRI of 0, and a standard white surface (initial solar reflectance 0.80, initial thermal emittance 0.90) has an initial SRI of 100. To calculate the SRI for a given material, obtain its solar reflectance and thermal emittance via the Cool Roof Rating Council Standard (CRRC-1). SRI is calculated according to ASTM E 1980. Calculation of the aged SRI is based on the aged tested values of solar reflectance and thermal emittance. value requirement. Consider also that LEEDv4 combines roof and nonroof heat island credits from v2009 in the calculation. Will there be an architectural shading device over the rooftop patio?

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Irene Chung Jun 07 2017 LEEDuser Member 3 Thumbs Up

Thank you Summer,

There is no plan to have any shading device on the rooftop patio.

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Omer Moltay
May 05 2017
Guest
2814 Thumbs Up

Roof Water Feature

Project Location: Turkey

Dear All,
My project is a museum building. The building roof is thick with water. So, project building roof have pool and observation terrace. Should it be counted as a reflective? Do I need to figure out the SRIA measure of the constructed surface's ability to stay cool in the sun by reflecting solar radiation and emitting thermal radiation. It is defined such that a standard black surface (initial solar reflectance 0.05, initial thermal emittance 0.90) has an initial SRI of 0, and a standard white surface (initial solar reflectance 0.80, initial thermal emittance 0.90) has an initial SRI of 100. To calculate the SRI for a given material, obtain its solar reflectance and thermal emittance via the Cool Roof Rating Council Standard (CRRC-1). SRI is calculated according to ASTM E 1980. Calculation of the aged SRI is based on the aged tested values of solar reflectance and thermal emittance. value of water?

Thanks to your help.

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Summer Minchew LEED AP ID+C, O+M , Ecoimpact Consulting May 05 2017 LEEDuser Expert 371 Thumbs Up

Reference the LEEDuser FAQ section for NC v2009 SSc7.2 for guidance on pools. Specifically, under v2009 this text states "While pools are not specifically mentioned in 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, 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). has informed LEEDuser that it would probably count them as an appurtenanceA built-in, nonstructural portion of a roof system. Examples include skylights, ventilators, mechanical equipment, partitions, and solar energy panels. and exclude them." I am not sure if this interpretation is allowed under v4. If your project is registered under LEED v4 you might ask your GBCI LEED Coach.

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Carmen Mielecke CEO LCEE Life Cycle Engineering Experts
Apr 19 2017
Guest
9 Thumbs Up

Heat Island reduction provided by the building itsself

Project Location: Germany

Dear All, if a Project consists of many small courtyyards and shade for those courtyyards is provided by the building structure itsself, Can this in any way be used to contribute to the fulfillment of the credit?

Thank you very much for your advice!
Kind regards, Carmen

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Summer Minchew LEED AP ID+C, O+M , Ecoimpact Consulting Apr 19 2017 LEEDuser Expert 371 Thumbs Up

Is the shade provided by an architectural shading device or structure? If yes, that would fall under Nonroof strategies.

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Carmen Mielecke CEO, LCEE Life Cycle Engineering Experts May 10 2017 Guest 9 Thumbs Up

Hallo Summer, thanks for your answer. There won´t be any roof to provide shade (I mean no extra structure), the shade is provided by the walls of the building. As the courtyyard are very small, there will hardly be sunlight in summer. I wonder if this can be considered to contribute to fulfil the requirement of the credit. What do you think?

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Carmen Mielecke CEO, LCEE Life Cycle Engineering Experts May 12 2017 Guest 9 Thumbs Up

Hallo Summer, thanks for your answer. There won´t be any roof to provide shade (I mean no extra structure), the shade is provided by the walls of the building. As the courtyyard are very small, there will hardly be sunlight in summer. I wonder if this can be considered to contribute to fulfil the requirement of the credit. What do you think?

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Summer Minchew LEED AP ID+C, O+M , Ecoimpact Consulting May 18 2017 LEEDuser Expert 371 Thumbs Up

Carmen: My sense is that you will not likely be allowed to consider the shade provided by the building itself. Consider the site/roof in plan view, assume direct sunlight overhead.

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Carmen Mielecke CEO, LCEE Life Cycle Engineering Experts May 23 2017 Guest 9 Thumbs Up

Hallo Summer,

thanks for your answer. As the plot is farFloor-area ratio is the density of nonresidential land use, exclusive of parking, measured as the total nonresidential building floor area divided by the total buildable land area available for nonresidential structures. For example, on a site with 10,000 square feet (930 square meters) of buildable land area, an FAR of 1.0 would be 10,000 square feet (930 square meters) of building floor area. On the same site, an FAR of 1.5 would be 15,000 square feet (1395 square meters), an FAR of 2.0 would be 20,000 square feet (1860 square meters), and an FAR of 0.5 would be 5,000 square feet (465 square meters). away from the equator, there will never be direct sunlight overhead. The ground will around the year always be shaded by the walls of the Building. Extra structures will not provide more shade, than there already is, they only would cost extra money...

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Summer Minchew LEED AP ID+C, O+M , Ecoimpact Consulting May 23 2017 LEEDuser Expert 371 Thumbs Up

Carmen: You could submit this strategy under alternative compliance path during credit review or you could submit this strategy for a formal 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. Inquiry. If you do please follow up and let us know how it goes.

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Edgar Arevalo
Jan 17 2017
Guest
62 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 371 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 62 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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Summer Minchew LEED AP ID+C, O+M , Ecoimpact Consulting May 05 2017 LEEDuser Expert 371 Thumbs Up

Consider total project parking spaces for Reduced Parking FootprintParking footprint refers to the area of the project site occupied by the parking areas and structures. and Green Vehicles. The fact that you have a service garage on your project does not necessarily prohibit your project from pursuing these credits.

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Juan Carlos Contreras INEDIT
Nov 05 2016
Guest
8 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 371 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 371 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 EffectThe thermal absorption by hardscape, such as dark, nonreflective pavement and buildings, and its subsequent radiation to surrounding areas. Other contributing factors may include vehicle exhaust, air-conditioners, and street equipment. Tall buildings and narrow streets reduce airflow and 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
138 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 371 Thumbs Up

Steven: Refer to LEEDUser FAQ for Schools v2009 SSc7.1 Heat Island EffectThe thermal absorption by hardscape, such as dark, nonreflective pavement and buildings, and its subsequent radiation to surrounding areas. Other contributing factors may include vehicle exhaust, air-conditioners, and street equipment. Tall buildings and narrow streets reduce airflow and exacerbate the effect. Non-Roof, "What is HardscapeThe inanimate elements of the building landscaping. It includes pavement, roadways, stonewalls, wood and synthetic decking, 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-SRIA measure of the constructed surface's ability to stay cool in the sun by reflecting solar radiation and emitting thermal radiation. It is defined such that a standard black surface (initial solar reflectance 0.05, initial thermal emittance 0.90) has an initial SRI of 0, and a standard white surface (initial solar reflectance 0.80, initial thermal emittance 0.90) has an initial SRI of 100. To calculate the SRI for a given material, obtain its solar reflectance and thermal emittance via the Cool Roof Rating Council Standard (CRRC-1). SRI is calculated according to ASTM E 1980. Calculation of the aged SRI is based on the aged tested values of solar reflectance and thermal emittance. 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
4 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 SRIA measure of the constructed surface's ability to stay cool in the sun by reflecting solar radiation and emitting thermal radiation. It is defined such that a standard black surface (initial solar reflectance 0.05, initial thermal emittance 0.90) has an initial SRI of 0, and a standard white surface (initial solar reflectance 0.80, initial thermal emittance 0.90) has an initial SRI of 100. To calculate the SRI for a given material, obtain its solar reflectance and thermal emittance via the Cool Roof Rating Council Standard (CRRC-1). SRI is calculated according to ASTM E 1980. Calculation of the aged SRI is based on the aged tested values of solar reflectance and thermal emittance. from it?

Thanks,

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Summer Minchew LEED AP ID+C, O+M , Ecoimpact Consulting Aug 30 2016 LEEDuser Expert 371 Thumbs Up

Hi Jonathan. You will need to have the existing roof tested to get the actual SRIA measure of the constructed surface's ability to stay cool in the sun by reflecting solar radiation and emitting thermal radiation. It is defined such that a standard black surface (initial solar reflectance 0.05, initial thermal emittance 0.90) has an initial SRI of 0, and a standard white surface (initial solar reflectance 0.80, initial thermal emittance 0.90) has an initial SRI of 100. To calculate the SRI for a given material, obtain its solar reflectance and thermal emittance via the Cool Roof Rating Council Standard (CRRC-1). SRI is calculated according to ASTM E 1980. Calculation of the aged SRI is based on the aged tested values of solar reflectance and thermal emittance. 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
18 Thumbs Up

SRI values and roof slope

Why does a low-slope roof require a higher initial SRIA measure of the constructed surface's ability to stay cool in the sun by reflecting solar radiation and emitting thermal radiation. It is defined such that a standard black surface (initial solar reflectance 0.05, initial thermal emittance 0.90) has an initial SRI of 0, and a standard white surface (initial solar reflectance 0.80, initial thermal emittance 0.90) has an initial SRI of 100. To calculate the SRI for a given material, obtain its solar reflectance and thermal emittance via the Cool Roof Rating Council Standard (CRRC-1). SRI is calculated according to ASTM E 1980. Calculation of the aged SRI is based on the aged tested values of solar reflectance and thermal emittance. 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
Guest
8 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 371 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
309 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 371 Thumbs Up

Under v4 project teams must provide manufacturer documentation or independent testing demonstrating SRIA measure of the constructed surface's ability to stay cool in the sun by reflecting solar radiation and emitting thermal radiation. It is defined such that a standard black surface (initial solar reflectance 0.05, initial thermal emittance 0.90) has an initial SRI of 0, and a standard white surface (initial solar reflectance 0.80, initial thermal emittance 0.90) has an initial SRI of 100. To calculate the SRI for a given material, obtain its solar reflectance and thermal emittance via the Cool Roof Rating Council Standard (CRRC-1). SRI is calculated according to ASTM E 1980. Calculation of the aged SRI is based on the aged tested values of solar reflectance and thermal emittance. 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 309 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 371 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
45 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 SRIA measure of the constructed surface's ability to stay cool in the sun by reflecting solar radiation and emitting thermal radiation. It is defined such that a standard black surface (initial solar reflectance 0.05, initial thermal emittance 0.90) has an initial SRI of 0, and a standard white surface (initial solar reflectance 0.80, initial thermal emittance 0.90) has an initial SRI of 100. To calculate the SRI for a given material, obtain its solar reflectance and thermal emittance via the Cool Roof Rating Council Standard (CRRC-1). SRI is calculated according to ASTM E 1980. Calculation of the aged SRI is based on the aged tested values of solar reflectance and thermal emittance.-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 223 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 45 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 223 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
223 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 6003 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
270 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 ( SRIA measure of the constructed surface's ability to stay cool in the sun by reflecting solar radiation and emitting thermal radiation. It is defined such that a standard black surface (initial solar reflectance 0.05, initial thermal emittance 0.90) has an initial SRI of 0, and a standard white surface (initial solar reflectance 0.80, initial thermal emittance 0.90) has an initial SRI of 100. To calculate the SRI for a given material, obtain its solar reflectance and thermal emittance via the Cool Roof Rating Council Standard (CRRC-1). SRI is calculated according to ASTM E 1980. Calculation of the aged SRI is based on the aged tested values of solar reflectance and thermal emittance., 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 7520 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 SRIA measure of the constructed surface's ability to stay cool in the sun by reflecting solar radiation and emitting thermal radiation. It is defined such that a standard black surface (initial solar reflectance 0.05, initial thermal emittance 0.90) has an initial SRI of 0, and a standard white surface (initial solar reflectance 0.80, initial thermal emittance 0.90) has an initial SRI of 100. To calculate the SRI for a given material, obtain its solar reflectance and thermal emittance via the Cool Roof Rating Council Standard (CRRC-1). SRI is calculated according to ASTM E 1980. Calculation of the aged SRI is based on the aged tested values of solar reflectance and thermal emittance. 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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Borja Sánchez Architect, gesHAB May 30 2017 Guest 4 Thumbs Up

Hello, I´d like to ask what happens when underground parking is out from the project boundary. In my case parking assigned to the building is reserved in an underground public parking next to the building but not owned by the building itself, and it´s under a public place. Is this parking elegible for option 2?.

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Summer Minchew LEED AP ID+C, O+M , Ecoimpact Consulting Jun 08 2017 LEEDuser Expert 371 Thumbs Up

Borja: This is a great question with a fairly complicated response. The reference guide for SSc Heat Island Reduction, Option 2. Parking Under Cover indicates that only parking spaces within the LEED project boundary can be included in the calculation for this credit. However, it also states that the total parking value must be consistent with the parking spaces used for other credits. The reference guide for LTc Reduced Parking FootprintParking footprint refers to the area of the project site occupied by the parking areas and structures. states: "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." The total vehicle parking capacity must include any leased, owned, or designated spaces located outside of the project boundary and must be consistent across credits. Therefore, I believe your project can include the reserved parking in the calculations for SSc Heat Island Reduction, Option 2. Parking Under Cover. You will want to write a narrative explaining your strategy and make sure that parking is treated consistently across all credits. Please follow up and let us know how this goes during review.

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Borja Sánchez Architect, gesHAB Jun 08 2017 Guest 4 Thumbs Up

Hi, Summer: I have already asked the same question to my LEED Coach and his answer has the same reasoning as you give me: "parking must be reported consistently throughout the project", that´s why undercover parking out from project boundary should count for Option 2 in this case. Hope this can help to any other with the same doubt.

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Jonathan Weiss
Jan 08 2015
LEEDuser Member
2635 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 hardscapeThe inanimate elements of the building landscaping. It includes pavement, roadways, stonewalls, wood and synthetic decking, 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 Senior Sustainability Manager, YR&G Apr 16 2015 LEEDuser Member 757 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 SRIA measure of the constructed surface's ability to stay cool in the sun by reflecting solar radiation and emitting thermal radiation. It is defined such that a standard black surface (initial solar reflectance 0.05, initial thermal emittance 0.90) has an initial SRI of 0, and a standard white surface (initial solar reflectance 0.80, initial thermal emittance 0.90) has an initial SRI of 100. To calculate the SRI for a given material, obtain its solar reflectance and thermal emittance via the Cool Roof Rating Council Standard (CRRC-1). SRI is calculated according to ASTM E 1980. Calculation of the aged SRI is based on the aged tested values of solar reflectance and thermal emittance. 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
2755 Thumbs Up

SRI value for concrete

Hi,
In LEED v2009 BD+C Sustainable Sites Credit 7.1 there is a table with solar reflectance indexA measure of the constructed surface's ability to stay cool in the sun by reflecting solar radiation and emitting thermal radiation. It is defined such that a standard black surface (initial solar reflectance 0.05, initial thermal emittance 0.90) has an initial SRI of 0, and a standard white surface (initial solar reflectance 0.80, initial thermal emittance 0.90) has an initial SRI of 100. To calculate the SRI for a given material, obtain its solar reflectance and thermal emittance via the Cool Roof Rating Council Standard (CRRC-1). SRI is calculated according to ASTM E 1980. Calculation of the aged SRI is based on the aged tested values of solar reflectance and thermal emittance. 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 Senior Sustainability Manager, YR&G Apr 16 2015 LEEDuser Member 757 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 SRIA measure of the constructed surface's ability to stay cool in the sun by reflecting solar radiation and emitting thermal radiation. It is defined such that a standard black surface (initial solar reflectance 0.05, initial thermal emittance 0.90) has an initial SRI of 0, and a standard white surface (initial solar reflectance 0.80, initial thermal emittance 0.90) has an initial SRI of 100. To calculate the SRI for a given material, obtain its solar reflectance and thermal emittance via the Cool Roof Rating Council Standard (CRRC-1). SRI is calculated according to ASTM E 1980. Calculation of the aged SRI is based on the aged tested values of solar reflectance and thermal emittance. values for roofing material and the SR values instead of SRI values for non roof hardscapeThe inanimate elements of the building landscaping. It includes pavement, roadways, stonewalls, wood and synthetic decking, 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 223 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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Jun 24 2017
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