Residential Greenroofing Greg Haines, Project Manager Turning Grey to Green, One Roof at a Time!

1. Residential Greenroofing Greg Haines, Project Manager Turning Grey to Green, One Roof at a Time!

2. The concept of greening a rooftop is centuries old. Photo: Greenroofs.com Church in Vidimyri, Iceland, 1834 Photo: Greenroofs.com Houses in Iceland, circa 1800’s Houses in Iceland, circa 1800’s

3. It was early recognized that green roofs could improve a building’sdurability, regulation of temperature, and overall aesthetic value. Residential building in Germany Photo: Greenroofs.com

4. The use of green roofs has increased significantly throughout Scandinavia. Ford dealership in Sweden Photo: Greenroofs.com

5. Major corporations are beginning to see the benefits of green roof technology. GAP Inc. Headquarters, San Bruno, CA Photo: Greenroofs.com

6. Photo Courtesy Tom Liptan II. Benefits Stormwater Mitigation: In Portland, as in most areas, stormwater is now recognized as the number one cause of degraded urban stream health. This is an especially serious issue for our Rainy City because our waterways once supported wild populations of salmon. Degraded Runoff

7. The Rainwater Sponge • Plants absorb rainwater for photosynthetic processes • Plants reintroduce water into the air through evapotranspiration • The soil acts like a sponge, absorbing water, much of which is released to the air through evaporation. • These processes remove 30% to 50% of rainwater that falls on ecoroofs in Portland • The effect on the storm sewer systems is a lower peak and a flattened curve for stormwater flow • This effects temperature, peak flow, and quality of the remaining runoff • There is Five Times more residential rooftop than Commercial Rooftop area • and this provides a great opportunity to reclaim our watersheds! A 1,500 sq. ft. roof will shed 34,000 gallons of rainwater a year.

8. Sound Reduction: • Absorbs both ambient and penetrating sound waves • Sound insulation improved by up to 8 dB • Reflected sound reduced by up to 3 dB • Vegetation absorbs high frequencies • Soil absorbs lower frequencies Building in the flight path of an Airport Photo courtesy of American Hydrotech Graphic Courtesy Zincoflor

9. Thermal Behaviors: • Surface temp reduction of 14 – 22 deg.F ( 4” of soil) • Significant wind chill reduction, reducing heat demand by 5% to 25% • Greenroofs function as either an insulator or heat sink, depending on moisture level. Either way, they help mitigate temperature extremes. • HVAC air conditioning units on greenroofs take in cooled air instead of superheated air • Urban Heat Island Effect Mitigation Cold Hot Graphic courtesy of Zincoflor Photo Courtesy Tom Liptan

10. Other Benefits: • Air Quality –Absorbs CO2 and Some Pollutants. Traps Dust, Releases Oxygen • Energy Savings:Functions as Either Insulator or Heat Sink, depending on moisture level • Wildlife Habitat and Greenspace Created up to 100% of Building Footprint • Livability: Buffers Noise, Eliminates Glare, Aesthetic Value, Psychological Advantages • Protection of Roof Surface Results in 2 to 3 Times Longer Life of Membrane Beekeeper’s Roof Provides Nectar for His Native Honeybees Ecoroof Atop Local Food Coop Includes Edible Herbs

11. Advancing the Industry by Reducing the Costs of Portland Area Ecoroofs: • We Share Our Knowledgebase of Lower-Cost, Locally-Available • Materials and Designs • EE Project Managers Can Help with Procurement and Delivery of • Materials Graphic Courtesy of Steve Cowden, The Oregonian An Example of Low Cost Materials, Used in an Ecoroof Costing $7.00/ ft2. Shown Here is Pond Liner, Filter Fabric, and Common Corrugated Drain Pipe.

12. Less Likely to Leak than Asphalt or Shingles, And Lasts 2-3 Times As Long! Hawthorne Hostel Ecoroof Installed August 2002

14. PCC Rock Creek Straw Bale EcoroofInstallation Thermoplastic Polyolefin TPO

15. Protection Board Installed Celotex Protection Board

16. Perimeter Strips Screwed In Place • The Membrane will be Heat Welded to these, to hold it down

17. Roof Drain Holes Drilled • The Roof Drain is made of Heat Weldable Membrane. A watertight connection is very important.

18. Roof Drain Hardware Being Installed from Underside of Roof • Simple Low Cost Parts • Easy to Source at Most Hardware Stores • Not Complicated

19. Closeup of Installed Drain • This will be waterproofed in the next steps

20. Membrane Being Placed On Roof

21. Roof Drain Welded to Membrane and “Dog Ear” being Formed for Corner Detail

22. Close up of “Dog Ear”

23. “Dog Ear” Being Welded with Heat Gun

24. Perimeter Strips Welded to Membrane to hold it down

25. Close up of Drain, Showing “Sleeve”

26. 60% Pumice 20% Recycled Paper 20% Composted Manure Pro-Grow Rooftop Ag. 1-1 (Tualatin Or.

27. Resources www.greenroofs.com www.ecoroofseverywhere.com www.greenerbuildings.com www.portlandonline.com/bes/index.cfm?c=34663 QUESTIONS & ANSWERS www.buildinggreen.com/auth/article.cfm?fileName=080509a.xml TPO www.uoregon.edu/~akwok/VSCS/Ecotrust02/W02ecoroof/new/frameworks/THpages/THhyme.html