Download - Residential Greenroofing Greg Haines, Project Manager Turning Grey to Green, One Roof at a Time!
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Residential GreenroofingGreg Haines, Project Manager
Turning Grey to Green,One Roof at a Time!
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The concept of greening a rooftop is
centuries old.Church in Vidimyri, Iceland,
1834
Houses in Iceland, circa 1800’s
Photo: Greenroofs.com
Photo: Greenroofs.com
Houses in Iceland, circa 1800’s
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It was early recognized that green roofs could improve a building’sdurability,
regulation of temperature, and overall
aesthetic value.
Residential building in GermanyPhoto: Greenroofs.com
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The use of green roofs has increased significantly throughout
Scandinavia.
Ford dealership in Sweden
Photo: Greenroofs.com
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Major corporations are beginning to see the benefits
of green roof technology.
GAP Inc. Headquarters, San Bruno, CA
Photo: Greenroofs.com
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Photo Courtesy Tom Liptan
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.
II. Benefits
Stormwater Mitigation:
Degraded Runoff
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• 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!
The Rainwater Sponge
A 1,500 sq. ft. roof will shed 34,000 gallons of rainwater a year.
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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
Graphic Courtesy ZincoflorPhoto courtesy of American Hydrotech
Building in the flight path of an Airport
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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
Graphic courtesy of Zincoflor
Cold
HotPhoto Courtesy Tom
Liptan
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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
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•We Share Our Knowledgebase of Lower-Cost, Locally-Available Materials and Designs•EE Project Managers Can Help with Procurement and Delivery of Materials
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.
Graphic Courtesy of Steve Cowden, The Oregonian
Advancing the Industry by Reducing the Costs of Portland Area Ecoroofs:
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Hawthorne Hostel EcoroofInstalled August 2002
Less Likely to Leak than Asphalt or Shingles, And Lasts 2-3 Times As Long!
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PCC Rock Creek Straw Bale Ecoroof
Installation
Thermoplastic Polyolefin TPO
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Protection Board Installed
Celotex Protection Board
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Perimeter Strips Screwed In Place
• The Membrane will be Heat Welded to these, to hold it down
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Roof Drain Holes Drilled• The Roof Drain is made of Heat
Weldable Membrane. A watertight connection is very important.
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Roof Drain Hardware Being Installed from Underside of
Roof • Simple Low
Cost Parts• Easy to
Source at Most Hardware Stores
• Not Complicated
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Closeup of Installed
Drain• This will be
waterproofed in the next steps
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Membrane Being Placed On Roof
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Roof Drain Welded to Membrane and “Dog Ear” being Formed for Corner Detail
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Close up of “Dog Ear”
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“Dog Ear” Being
Welded with Heat
Gun
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Perimeter Strips Welded to Membrane to hold it
down
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Close up of Drain, Showing “Sleeve”
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60% Pumice20% Recycled Paper20% Composted ManurePro-Grow Rooftop Ag. 1-1(Tualatin Or.
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Resources
www.greenroofs.comwww.ecoroofseverywhere.comwww.greenerbuildings.comwww.portlandonline.com/bes/index.cfm?c=34663
QUESTIONS & ANSWERSwww.buildinggreen.com/auth/article.cfm?
fileName=080509a.xml TPO
www.uoregon.edu/~akwok/VSCS/Ecotrust02/W02ecoroof/new/frameworks/THpages/THhyme.html