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Adding Value with Green Roofs
Kirstin Weeks, Arup
Green Roof Professional, LEED AP, CEM

1
Sir Ove Arup founded his practice in 1946 based
on a belief in ‘total architecture’
integration and interdependence, innov...
Image: safeguardchem.co.za

Photo Credit Lisa Lee Benjamin
Image Credit: Kay Cheng, SF Planning
Photo Credit Lisa Lee Benjamin
6
Photo: Curran House Roof, Credit Brian Rose

7
Photo Credit Laura Tam, SPUR
Benefits and Uses of Green Roofs
Stormwater Management

Roof Longevity

Habitat and Biodiversity

Building Energy Savings,...
Stormwater Performance
• Retains 30% - 100% over the duration of a
storm (up to 3.5”)
• Reduces runoff rate by up to 85% (...
Heat Island & Energy
• Annual energy savings ~$0.17 per square foot
of roof (varies widely by climate and building
charact...
Biodiversity and Habitat
• Governments developing ways to value
natural ecosystems, i.e., Australia’s
BushBroker scheme ($...
Photo Credit Laura Tam, SPUR
Quality of Life and Real Estate
• A study showed that access to views of greenery has
increased productivity 2.9%
• Potent...
age: IRS Kansas City, GSA
Photo: Denver EPA, Credit EPA
Photo: olpos.com
Photo: olpos.com
Green roof costs
• Installation costs ($ per square foot):
$20

6” semi-intensive

$18
$16
$14
$12
$10

3” extensive
5,000...
GSA Study Results – 30 yr NPV
NPV = $2.70/ft2

Payback = 6.2 years
(Simple 15 yrs)

IRR = 5.2%

$30

$30

Net Present Valu...
cost of green roof – cost of alternative = true green roof premium
stormwaterdesignguidelines
SAN FRANCISCO

Stormwater
Management
Ordinance
83-10 May 2010

Image Credit: SFPUC
True green roof cost = max $6/sf, min $0/sf
min

$3/sf!
Looking ahead…
Roadmap for Green Roof Policy in SF

Image Credit: Kay Cheng, SF Planning

www.spur.orggreenroofs
Image: Transbay Terminal

Image: 201 Folsom, Spinnakersf.com
Contact Info and Links

Kirstin Weeks, Arup
560 Mission Street, Seventh Floor
San Francisco, CA 94105
direct 415 946 0746
...
Adding Value with Green Roofs by Kirstin Weeks
Adding Value with Green Roofs by Kirstin Weeks
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

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Adding Value with Green Roofs by Kirstin Weeks

  1. 1. Adding Value with Green Roofs Kirstin Weeks, Arup Green Roof Professional, LEED AP, CEM 1
  2. 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. 3. Image: safeguardchem.co.za Photo Credit Lisa Lee Benjamin
  4. 4. Image Credit: Kay Cheng, SF Planning
  5. 5. Photo Credit Lisa Lee Benjamin
  6. 6. 6
  7. 7. Photo: Curran House Roof, Credit Brian Rose 7
  8. 8. Photo Credit Laura Tam, SPUR
  9. 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 $
  10. 10. 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.
  11. 11. 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
  12. 12. Biodiversity and Habitat • Governments developing ways to value natural ecosystems, i.e., Australia’s BushBroker scheme ($0.42 - $1.46/sf)
  13. 13. Photo Credit Laura Tam, SPUR
  14. 14. 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 ~$13 per square foot national (rents, expenses, vacancy, discount rates, absorption and lease lengths) • Green roofs increase premiums of a building (i.e., green buildings) - ~2.5% nationally
  15. 15. age: IRS Kansas City, GSA
  16. 16. Photo: Denver EPA, Credit EPA
  17. 17. Photo: olpos.com
  18. 18. Photo: olpos.com
  19. 19. Green roof costs • Installation costs ($ 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
  20. 20. 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.)
  21. 21. cost of green roof – cost of alternative = true green roof premium
  22. 22. stormwaterdesignguidelines SAN FRANCISCO Stormwater Management Ordinance 83-10 May 2010 Image Credit: SFPUC
  23. 23. True green roof cost = max $6/sf, min $0/sf
  24. 24. min $3/sf!
  25. 25. Looking ahead…
  26. 26. Roadmap for Green Roof Policy in SF Image Credit: Kay Cheng, SF Planning www.spur.orggreenroofs
  27. 27. Image: Transbay Terminal Image: 201 Folsom, Spinnakersf.com
  28. 28. 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

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