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Stormwater Academy: Green Roofs. Green Roof Design and Operation (Part IV) 2006 FSA Annual Conference June 14 , 2006. By Marty Wanielista and Mike Hardin. FSA. DESIGN and CONSTRUCTION. LEED Certification Energy Performance Conclusions and Recommendations Questions and Comments.

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Stormwater Academy: Green Roofs

Green Roof Design and

Operation

(Part IV)

2006 FSA Annual Conference

June 14, 2006

By Marty Wanielista and Mike Hardin

FSA


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DESIGN and CONSTRUCTION

  • LEED Certification

  • Energy Performance

  • Conclusions and Recommendations

  • Questions and Comments


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LEED (Leadership in Energy & Environmental Design) Green Building Rating System

A leading-edge system for designing, constructing, operating and certifying green buildings.


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LEED-NC Ratings Building Rating System

Certified: 26-32 Points

Silver: 33-38 Points

Gold: 39-51 Points

Platinum: 52-69 Points


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LEED & Stormwater Management Building Rating System

Sustainable Sites

Prerequisite – Erosion and Sedimentation Control

Credit 5.1 – Reduced Site Disturbance

Credit 6.1 & 6.2 – Stormwater Management

Credit 7.1 & 7.2 - Landscape & Exterior Design to Reduce Heat Islands


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Sustainable Sites Building Rating System

Credit 5.1 – Reduced Site Disturbance: 1 Point

Intent: Conserve existing natural areas and restore damaged areas to provide habitat and promote biodiversity.

Note: One point Credit 5.2 can be obtained as an indirect point if the project qualifies for the SSCredit 2.


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Sustainable Sites Building Rating System

Credit 6.1 & 6.2 – Stormwater Management: 2 Points

(Rate & Quantity)

Intent: Limit disruption of natural water flows by minimizing stormwater runoff, increasing on-site infiltration and reducing contaminations.


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Sustainable Sites Building Rating System

Credit 7.1 & 7.2 - Landscape & Exterior Design to Reduce Heat Islands

2 Points

Requirement: Use ENERGY STAR compliant (highly reflective) AND high emissivity roofing (emissivity of at least 0.9 when tested in accordance with ASTM 408) for a minimum of 75% of the roof surface; OR, install a green (vegetated) roof for at least 50% of the roof area. Combinations of high albedo and vegetated roof can be used providing they collectively cover 75% of the rood area.


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Water Efficiency Building Rating System

Credit 1.1 & 1.2 – Water efficient landscaping reduce potable water usage

2 Points

Intent: Limit or eliminate the use of potable water, or other natural surface or subsurface water resources available on or near the project site, for landscape irrigation.


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Energy and Atmosphere Building Rating System

Prerequisite 1 – Fundamental Commissioning of the Building Energy Systems

Prerequisite 2 – Minimum Energy Performance

Prerequisite 3 – Fundamental Refrigerant Management

Credit 1 – Optimize Energy Performance

Credit 4 – Ozone Depletion


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Energy and Atmosphere Building Rating System

Credit 1 – Optimize Energy Performance

3 Points

Intent: Achieve increasing levels of energy performance above the baseline in the prerequisite standard

to reduce environmental and economic impacts associated with excessive energy use.

Note: There is a total possible of 10 points but the average green roof will only be able to obtain 3 points


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Energy and Atmosphere Building Rating System

Credit 4 – Ozone Depletion

1 Point

Intent: Reduce ozone depletion and support early compliance with the Montreal Protocol while

minimizing direct contributions to global warming.


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Florida: Green Roofs Building Rating System

Example Temperature Comparisons oF

Conventional Roof (red) versus Green Roof (green) at the roof surface

In the evening,

radiation is

present and

conditioned

space losses

to the roof.

Source: www.stormwater.ucf.edu and click on roof monitoring data


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Energy Performance Building Rating System

  • Reference: Jeff Sonne, FSEC

  • ASHRAE Journal Feb 2006.

  • Sustainability section: Evaluating Green Roof Energy Performance.. There is 18.3% less heat loss with the green roof compared to the conventional roof and as the conventional roof ages (turns from a silver to black color), the difference will be greater and there will be more cost savings.


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Stormwater Academy: Green Roofs Building Rating System

CONCLUSIONS

  • Green roofs can be constructed and operated in a central Florida environment.

  • Green roofs with a cistern can be used as a stormwater treatment method.

  • 3. The average discharge coefficient is about 0.5 for rainfall of 1 inch. The effective impervious area is about ½ of the roof area.

  • 4. There are many other benefits such as reduction in

  • heat islands, carbon dioxide, noise, and very real

  • psychological benefits.


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Stormwater Academy: Green Roofs Building Rating System

More CONCLUSIONS

  • In terms of pollution and volume control, vegetated roofs are better than non vegetative ones.

  • ET rates are higher in “summer periods” relative to “winter periods” thus irrigation rates can be reduced during winter time periods.

  • Black and Gold Nuggets™ are very effective for water quality improvement.

  • LEED certification points can be attained with green roofs.


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Florida: Green Roofs Building Rating System

For more Information:

Marty Wanielista,

407.823.4144

[email protected]

For web cam and other publications:

www.stormwater.ucf.edu


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Questions and Comments Building Rating System


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