the greening of the rooftop module 4 green building rating systems what are they? how do they work?

The Greening of the Rooftop

Module 4

Green Building Rating Systems

What Are They? How Do They Work?


What About Rating Systems?

LEED®

Energy Star

Green GlobesGreenGuard

Green SealC2C

• Capture Imagination and Commitment– “I want a LEED Platinum building”

• Offer a “Shortcut” to Measurement & Control– Reduce complexity and administrative cost


The Role Of Rating Systems

• May Ignore Critical Environmental Impacts– Weighting system may be inaccurate– Key impacts may be overlooked

• May Not Assure Long-Term Performance– Project may not perform as intended– Environmental benefits are not assured


The Role Of Rating Systems

• Whole Building Rating Systems– LEED® (US Green Building Council)

– GreenGlobes (Green Building Initiative)


Rating System Types

• Product Rating Systems– EnergyStar (Appliances, equipment, roofs)

– GreenSeal (Mostly consumer products)

– Cradle-to-CradleSM (Mostly architectural products)

– Plus many more…


Rating System Types


The US Green Building Council

(USGBC)


The USGBC

• Over 11,000 member organizations

• Mission: “Transform the way buildings are designed, built and operated”

• Sponsor of Greenbuild, the world’s largest green building convention

• Founded the LEED® Green Building Rating System™ in 2000

Source: USGBC Backgrounder. Available at http://www.usgbc.org/DisplayPage.aspx?CMSPageID=225


The LEED® Rating System

• Sets a “nationally accepted benchmark for the design, construction, and operation of high performance green buildings”

• Gives building owners a tool for “immediate and measurable impact on their buildings’ performance”

• Provides a roadmap for “measuring and documenting success for every building type and phase of a building lifecycle”

Source: USGBC Backgrounder. Available at http://www.usgbc.org/DisplayPage.aspx?CMSPageID=225



A comprehensive but simple approach focused on six key concepts:

1. Sustainable Building Sites

2. Water Efficiency

3. Energy Efficiency / Atmospheric Impact

4. Sustainable Materials Selection

5. Indoor Environmental Quality

6. Innovation & Design



Different forms for different building types and phases of the building lifecycle:

– LEED for New Construction / Major Renovations

– LEED for Existing Buildings and Maintenance

– LEED for Commercial Interiors

– LEED for Core & Shell

– LEED for Homes (Pending)

– LEED for Neighborhoods (Pending)

A weighted scoring system based on relative importance of each key element:

Sustainable SitesWater EfficiencyEnergy / AtmosphereMaterials / ResourcesIndoor Environ. QualityInnovation / Design

14 Points5 Points

17 Points13 Points15 Points

5 Points69 Points

LEED Certified:LEED Silver:

26-32 pts.33-38 pts.

LEED Gold:LEED Platinum:

39-51 pts.52-69 pts.



20%7%

24%19%22%

7%


Roofing in the LEED® Rating System

CATEGORY:

Sustainable Sites (SS)Sustainable Sites (SS)Sustainable Sites (SS)

Water Efficiency (WE)Water Efficiency (WE)

CREDIT:

6.16.27.2

1.11.2

DESCRIPTION:

Storm Water Management : Reduce water run off 50%Storm Water Management : Improve storm water quality.Heat Island Effect (Roof): Mitigate Heat Island Effect:

Reflective RoofVegetated Roof

Water Efficient Landscaping: Reduce water usage 50%.Water Efficient Landscaping: Eliminate potable water use.

Categories in which roofing may contribute…..

Source: LEED NC 2.2 & LEED EB 2.0

Note: Credit descriptions provided for introductory reference only. Consult a LEED-Accredited Professional prior to designing or specifying a building project.



CATEGORY:

Energy / Atmosphere (EA)Energy / Atmosphere (EA)

Materials / Resources (MR)


CREDIT:

1

2

1.1

2.1 / 2.2

DESCRIPTION:

Optimize Energy Performance: Increase energy efficiency / decrease energy consumption

On-Site Renewable Energy: Generate on-site energy from renewable sources.

Building Reuse: Maintain 75% of building envelope.

Construct. Waste Mgmt: Divert 50% to 75% from disposal.






CATEGORY:




CREDIT:

4.1 / 4.2

5.1 / 5.2

6

DESCRIPTION:

Recycled Content: Use materials with 10% to 20% recycled content.

Regional Materials: Use materials extracted, processed & manufactured within 500 miles.

Rapidly Renewable Materials: Use rapidly renewable materials for 2.5% of total material.





Advantages of LEED

• Promotes the “Big Picture”

• Keeps it Simple

• Fosters Competition

• Builds Green Awareness


Limitations of LEED

• Limited Reach– Less than 2% of all buildings since 2000 have achieved certification

• Potential for Confusion

– “Is your roof LEED-approved?”

• Inadequate Emphasis on System Integration & Durability

LEED® & Durability

USGBC Response to Durability Concerns:

Add Life Cycle Assessment (LCA) to

LEED®

The Future of LCA

LEED® and LCA

• US Green Building Council (USGBC) established LCA task groups in 2005

• LCA guidelines published January, 2007

• Formal implementation proposed for 2009

LEED® & LCA

USGBC Guidelines for LCA

• Use ISO 14000 as general framework

• Use TRACI (1) as the impact model

• Use 60 years as the study period

• Begin to integrate into LEED point system, starting with Materials & Resources credits

(1) EPA Tool for the Reduction and Assessment of Chemical and other Environmental Impacts (TRACI)

LEED® & LCA

Immediate Implementation

• Informal implementation started in 2007 by adding several product rating systems under Innovation in Design credits:

– Cradle-to-CradleSM Certification

– California Gold Sustainable Carpet Standard

CENTRIASRS® Roofing

Expires 09-09-2008

The CENTRIA SRS Structural Standing Seam Roof System is a mechanically seamed standing seam roof featuring an integral batten. It can be roll-formed in the field for continuous long panel lengths and provides excellent weathertightness and an attractive appearance in a wide range of industrial, commercial, and architectural applications.

For more information please visit http://www.centria.com/C5/SSS/default.aspx.

LEED® & Product Certification

Cradle to CradleSM Certification

http://www.centria.com/C5/SSS/default.aspx


Green Globes

• Sponsored by Green Building Initiative– Originated in Canada

– Now headquartered in Washington, DC

– Significant support from National Association of Home Builders (NAHB) and other organizations

– First rating body accredited as a Standards Developing Organization

(SDO) by the American National Standards Institute (ANSI)


Green Globes

• Increased Emphasis on Planning, Management, Durability, and Energy

– Points for project planning– Required commissioning & verification process– Points for durability & life cycle assessment– Increased points for energy efficiency

• Integrated LCA Tool / Calculator– Athena EcoCalculator for Assemblies

Green Globes

Green Globes Point System

Project ManagementSiteEnergyWaterResources & MaterialsEmissionsIndoor Environment

50 Points115 Points360 Points100 Points100 Points

75 Points200 Points

1000 Points

5%11%36%10%10%

8%20%

350 – 549

550 - 699

700 - 849

850 - 1000


Roofing in the Green Globes System

CATEGORY:

Project Management

Site

Energy

CREDIT:

A.1.2- A.1.4A.2.1

B.2.6B.3.2

C.2.4C.2.7

DESCRIPTION:

Design Process : Participate in design processCertified Products : Minimum 3 certified products

Mitigate Heat Island: Reflective or vegetative roofRoof Water Runoff: Control and use roof storm water

Daylighting: Install roof daylighting systemRoof Insulation: Meet or exceed ASHRAE 90.1-2004Roof Water Runoff: Control and use roof storm waterAir Barrier: Install continuous bldg. envelope barrierVapor Retarder: Install roof vapor retarder when neededClean Energy: Install solar or wind energy on roof


Source: Green Globes v.1

Note: Credit descriptions provided for introductory reference only. Consult Green Building Initiative prior to designing or specifying a building project.


Roofing in the Green Globes System

CATEGORY:

Water

Resources & Materials

CREDIT:

D.2.3

E.1.1E.2.1E.2.2E.2.3E.4.1

E.4.4

DESCRIPTION:

Irrigation : Use rooftop water for irrigation

Life Cycle Assessment: Conduct LCA for roofMaterial Re-Use: Re-use portion of exist. roof materialsRecycled Content: Use roof materials. w/ recycled contentBio-Based Materials: Use bio-based roof materialsRain Penetration: Control potential rain penetration into

buildingEase of Disassembly: Install roof that is easy to

disassemble at end of life.


Source: Green Globes v.1

Note: Credit descriptions provided for introductory reference only. Consult Green Building Initiative prior to designing or specifying a building project.


Find out more …

• US Green Building Council / LEED®

• Green Building Initiative / Green Globes

http://www.usgbc.org/

http://www.thegbi.org/home.asp

the greening of the rooftop module 4 green building rating systems what are they? how do they work?

Documents

leed platinum building

role of rating systems

leed rating system category

building owners

points leed

sustainable building

different building types

building lifecycle source