Adding Value with Green Roofs by Kirstin Weeks
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Adding Value with Green Roofs by Kirstin Weeks
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Adding Value with Green Roofs by Kirstin Weeks
- 1. Adding Value with Green Roofs Kirstin Weeks, Arup Green Roof Professional, LEED AP, CEM 1
- 2. Sir Ove Arup founded his practice in 1946 based on a belief in ‘total architecture’ integration and interdependence, innovation and the social purpose of design. We shape a better world.
- 3. Image: safeguardchem.co.za Photo Credit Lisa Lee Benjamin
- 4. Image Credit: Kay Cheng, SF Planning
- 5. Photo Credit Lisa Lee Benjamin
- 6. 6
- 7. Photo: Curran House Roof, Credit Brian Rose 7
- 8. Photo Credit Laura Tam, SPUR
- 9. Benefits and Uses of Green Roofs Stormwater Management Roof Longevity Habitat and Biodiversity Building Energy Savings, Improved PV Production Urban Agriculture Acoustic Insulation Air Quality Improvement Aesthetics and Quality of Life Job Generation Urban Heat Island Reduction Accessible Open Space Property Value Increase $
- 11. Stormwater Performance • Retains 30% - 100% over the duration of a storm (up to 3.5”) • Reduces runoff rate by up to 85% (avg 65%) • Deeper soil, low slope, retention features and large roofs improve performance.
- 12. Heat Island & Energy • Annual energy savings ~$0.17 per square foot of roof (varies widely by climate and building characteristics) • Community wide energy and peak load reduction
- 13. Biodiversity and Habitat • Governments developing ways to value natural ecosystems, i.e., Australia’s BushBroker scheme ($0.42 - $1.46/sf)
- 15. Photo Credit Laura Tam, SPUR
- 16. Quality of Life and Real Estate • A study showed that access to views of greenery has increased productivity 2.9% • Potential real estate value of ~$13 per square foot national (rents, expenses, vacancy, discount rates, absorption and lease lengths) • Green roofs increase premiums of a building (i.e., green buildings) - ~2.5% nationally
- 17. age: IRS Kansas City, GSA
- 18. Photo: Denver EPA, Credit EPA
- 19. Photo: olpos.com
- 20. Photo: olpos.com
- 21. Green roof costs • Installation costs ($ per square foot): $20 6” semi-intensive $18 $16 $14 $12 $10 3” extensive 5,000 10,000 • Maintenance costs: $0.04 to $0.30/sf/yr 50,000
- 22. GSA Study Results – 30 yr NPV NPV = $2.70/ft2 Payback = 6.2 years (Simple 15 yrs) IRR = 5.2% $30 $30 Net Present Value ($/ft2) $20 $14 $13 $7 $10 $3 $0 ($10) -$17.5 ($20) Installation, Replacement & Maintenance 22 Stormwater Energy CO2e (Emissions, Sequestration & Absorption) Initial Real Estate Community Effect (Value, Rent Benefits (Biodiv, Air Absorption & Quality, Heat Vacancy) Island, etc.)
- 23. cost of green roof – cost of alternative = true green roof premium
- 24. stormwaterdesignguidelines SAN FRANCISCO Stormwater Management Ordinance 83-10 May 2010 Image Credit: SFPUC
- 25. True green roof cost = max $6/sf, min $0/sf
- 26. min $3/sf!
- 27. Looking ahead…
- 28. Roadmap for Green Roof Policy in SF Image Credit: Kay Cheng, SF Planning www.spur.orggreenroofs
- 29. Image: Transbay Terminal Image: 201 Folsom, Spinnakersf.com
- 31. Contact Info and Links Kirstin Weeks, Arup 560 Mission Street, Seventh Floor San Francisco, CA 94105 direct 415 946 0746 mobile 415 730 6444 kirstin.weeks@arup.com GSA Report Link: http://www.gsa.gov/portal/category/104999 SPUR Roadmap for SF: www.spur.orggreenroofs