the greenest building: quantifying the environmental value of building reuse fortidsminneforeningen/...
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The Greenest Building: Quantifying The Environmental Value of Building ReuseFORTIDSMINNEFORENINGEN/ Oslo School of Architecture and Design
5 SEPTEMBER 2012
PATRICE FREY, DIRECTOR OF SUSTAINABILITY, NTHP
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The National Trust for Historic Preservation provides leadership,
education, advocacy and resources to help people save the places
that matter to them.
Nantucket Lightship, MassachusettsUnion Station, Washington DC© National Trust for Historic Preservation, 2012
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Seattle, Washington
Preservation Green Lab Offices; Seattle, Washington
Objective: Reduce demolitions and improve building performance through research and policy development.
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Presentation Overview
I. Demolition Tends in the United States
II. Energy Performance of Older Buildings
III. Environmental Value of Building Reuse
IV. Reducing Demolitions
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27% Demolished
Source: Brookings Institution
73% Retained
U.S. Demolition Projections2005−2030
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Chicago DemolitionsArea Demolished 2004-2012:
• 35 Million Sq Feet / -- 3.4 Million Sq Meters
• Approx 1.8 Sq Miles -- 3 Sq Kilometers
• 530 Average City Blocks
• 2,353,000 Tons of Debris
Source: Preservation Green Lab
Chicago, Illinois
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•Architects –prefer blank canvas
• Industry/economy aligned behind new construction
•Economics of reuse
•Green Builders? Environmentalists?
The Challenges to Reuse
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Source: U.S. Department of Energy, 2003
Older Buildings and EnergyAverage annual energy consumption Btu/sq. ftCommercial Buildings (non malls)
Before 1920 80,127
1920 - 1945 90,234
1946 - 1959 80,198
1960 - 1969 90,976
1970 - 1979 94,968
1980 - 1989 100,077
1990 - 1999 88,834
2000 - 2003 79,703
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Older Buildings and EnergyMedian Energy Use Per Sq Ft By Building Type and Age Group
Source; NY University/ City of New York Data 2011-2012Multi-family Office
Year Built
So
urc
e E
UI
(an
nu
al k
btu
/sq
ft)
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Source: U.S. Energy Information Administration, 2005 Residential Energy Consumption Survey
Older Buildings and Energy
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Older Buildings: Thermal Mass
Monadnock Building, Chicago
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Older Buildings: Glazing/Windows
Source: Monica Arellano-Ongpin, Flickr Chicago Architecture Today, Flickr
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Older Buildings: Passive Ventilation
Source: Quinn.Anya, Flickr
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Challenging Assumptions about Green Building
The greenest buildings are the ones already built.
Building new, more efficient buildings is the only way to address climate change impacts related to the building stock.
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It takes between 35−50 years for a new, green home to recover the carbon expended during the construction process.
−Empty Homes Agency, UK, 2008
Previous Research: Residential
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• 2006 study compared new construction vs. renovation
• Approx. 38 years for new, energy efficient building to recover the carbon expended during the construction process
Previous Research: Institutional
Buchanan Building Complex, University of British Columbia. Courtesy Martin Nielsen Busby, Perkins & Will
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“The Greenest Building” Report
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• Under what conditions is building reuse environmentally preferable to demolition and new construction?
• Do benefits differ by region and building type?
• Are there significant opportunities to reduce near term carbon emissions by reusing buildings rather than constructing anew?
Guiding Questions
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Madison Lenox Hotel Demolition, Detroit MI
• Embodied energy of existing building viewed as a “sunk cost”
• Avoidance of environmental impacts that results from not constructing a new building
“Avoided Impacts” Approach
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Single-family residential
Multifamilyresidential
Urban villagemixed-use
Commercial Office
Elementaryschools
Case Study Buildings
© National Trust for Historic Preservation, 2012.
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Lifecycle Stages
© National Trust for Historic Preservation, 2012.
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• Human toxicity• Ionising radiation• Ozone layer
depletion• Photochemical
oxidation• Respiratory effects
• Aquatic ecotoxicity• Land occupation• Terrestrial
acidification & nutrification
• Terrestrial ecotoxicity
• Non-renewable energy• Mineral extraction
Resources Ecosystem quality
Human health
Climate Change
IMPACT2002+
Life Cycle Impact Assessment
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Portland(Mild Climate)
Phoenix(Hot/Dry Climate)
Chicago(Cold Climate)
Atlanta(Hot/Humid Climate)
Climate Regions
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Test Conditions
© National Trust for Historic Preservation, 2012.
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Building reuse almost always yields fewer environmental impacts than new construction when comparing buildings of similar size and functionality.
Findings: Reuse Matters
© National Trust for Historic Preservation, 2012.
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Findings: Reuse MattersCommercial Office: Climate Change Impacts
© National Trust for Historic Preservation, 2012.
NC = New Construction
RR = Reuse and Retrofit
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Findings: Reuse MattersCommercial Office, Portland: Climate Change Impacts
© National Trust for Historic Preservation, 2012.
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It can take between 10 to 80 years for a new energy efficient building to overcome, through efficient operations, the climate change impacts created by its construction.
© National Trust for Historic Preservation, 2012
Findings: Reuse Matters
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The majority of building types in different climates will take between 20-30 years to compensate for the initial carbon impacts from construction.
Findings: Reuse Matters
Seattle Washington Mutual Tower Under Construction; Source: Flickr
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A single family home will take between 38-50 years to compensate for the initial carbon impacts from construction.
Findings: Reuse Matters
Project7ten - California (pending LEED Platinum); Inhabitat.com
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31
Findings: Reuse Matters
Ecosystem Quality Impacts - Portland
Improving energy efficiency can increase other negative environmental impacts.
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Findings: Scale Matters
© National Trust for Historic Preservation, 2012.
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Findings: Design Matters
The quantity and type of materials used in a building renovation can reduce, or even negate, the environmental benefits of reuse when compared to new construction.
.
© National Trust for Historic Preservation, 2012.
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• Warehouse to residential exception
• Material inputs resemble new construction
• Further research needed on material and energy use of warehouse conversions
Findings: Design Matters
© National Trust for Historic Preservation, 2012.
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Reducing Demolitions
• What are the market and policy barriers to reuse? • How do these vary by city/location?
• What incentives are needed to increase reuse?
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Reducing Demolitions
• Pioneering new energy code based on flexibility and measurement
• Exploring incentives for seismic-retrofits
• Identifying financing sources for green retrofits
Seattle Space NeedleSource: Flickr
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Reducing Demolitions – Windows
Source: Kevitivity, Flickr
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Windows Study
D R A F T
Objectives
• Characterize performance of older, leaky, single pane residential windows
• Compare the relative energy savings from window upgrade measures
• Provide recommendations related to improving window performance across different U.S. climate regions.
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Portland(Mild Climate)
Phoenix(Hot/Dry Climate)
Chicago(Cold Climate)
Atlanta(Hot/Humid Climate)
Windows Study Climate Regions
Boston(Cold Climate)
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Findings
• Retrofit Measures Can Achieve Performance Results Comparable to New Replacement Windows.
• Almost Every Retrofit Option Offers a Better Return on Investment than Replacement Windows
Green Lab Windows Study
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Green Lab Windows StudyANNUAL PERCENT ENERGY SAVINGS FOR VARIOUS WINDOW UPGRADE OPTIONS
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Green Lab Windows Study
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Concluding Thoughts
I. Energy performance of older buildings tends to be very good; “good bones” to work with
II. Demolition/new construction create significant environmental impacts;
III. Conclusion: Reuse is a key environmental solution
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Older Buildings: Durability
Source: Scooter, Flickr
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Older Buildings: Adaptability
Union Row Apartments, Washington DC