Intro to Green Roofs for Educators
•Download as PPTX, PDF•
3 likes•2,715 views
A brief overview about the green building strategy known as green roofing. This presentation was originally prepared for St. Louis regional educators who attended the 2014 Sustainability Institute for P12 Educators.
Recommended
More Related Content
What's hot
What's hot (20)
Viewers also liked
Viewers also liked (20)
Similar to Intro to Green Roofs for Educators
Similar to Intro to Green Roofs for Educators (20)
Recently uploaded
Recently uploaded (20)
Intro to Green Roofs for Educators
- 1. An Introduction to Green Roofs Mark Ostendorf MS Environmental Sciences LEED Green Associate http://www.linkedin.com/in/mostendorf
- 2. Background • 2008, BGS emphasizing Sustainability – MSSU, Joplin, MO • 2012, MS Environmental Sciences – SIUE, Edwardsville, IL – SIUE G.R.E.E.N. Member (Green Roof Environmental Evaluation Network) – Thesis: Evaluating the Environmental Benefits of Green Retaining Walls • 2012-2014, Living Wall Company – Product Manager – Worked on numerous green wall projects • LEED Green Associate
- 3. Overview 1. What is a green roof? 1. Composition of a Green Roof 2. Types of Green Roofs 2. Advantages of green roofs 1. Stormwater Benefits 2. Other Benefits 3. Feasibility for green roofs at schools 1. Defining Goals and Purpose 2. Budget, for installation and maintenance 3. Selecting the correct green roof system 4. Green Roof Examples around the St. Louis region 1. St. Louis Zoo 2. SIU Edwardsville 3. Shaw Nature Reserve 4. NGRREC
- 4. Living Architecture Old Concept, New Technology • Hanging Gardens of Babylon One of the Seven Wonders of the Ancient World – Green Roofs – Living Walls • Sod Homes – Europe – North America • Modern Green Roofs – Germany in the 1970s – Established building standards (see FLL) – Becoming popular in North America • Philadelphia • Chicago • Washington, D.C. • New York • Seattle • Vancouver
- 6. What is a green roof? • A building roof that is covered with vegetation, which is planted into engineered growth medium – Rooftop Garden – Living Roof – Vegetated Roof – Eco-Roof – Nature Roof
- 7. How does a green roof work? ← Vegetation ← Soil or Growing Medium ← Root Reinforcement Mat ← Water Storage/Drainage ← Root Barrier ← Roof Membrane ← Roof Structure Built-in-place system
- 8. Variable Green Roof Systems SIUe Student Success Center Modular System
- 9. What is ‘engineered’ growth medium? Not really soil…too heavy, too much organic stuff • Green Roofs >20 lbs per sq ft, saturated • Less organic material – Increases longevity of ‘soil’ – Organic material degrades – Decreases weeds • Engineered media holds more moisture
- 10. What grows on a green roof? Characteristics • Hardy • Drought-tolerant • Shallow root systems • Sun-tolerant Types • Groundcovers • Succulents • Grasses • Native Plants • Shrubs • Small Trees • Vegetables St. Louis Zoo Succulent Groundcover Grasses, Natives, Trees Wheat-covered Green Roof
- 11. Types of Green Roofs Extensive Intensive
- 12. Extensive Green Roofs • Growing Medium <6 in depth • Vegetation: – Typically Sedum (Stonecrops) • Low Maintenance • Little to no structural reinforcement – 15-45 lbs per sq ft • Designed for no or infrequent irrigation • Easier to install on existing buildings • $10-15 per sf, installed Sedum: Drought-tolerant, Succulent, Shallow Roots Ford Factory, Sedum-covered Green Roof
- 13. Intensive Green Roofs • Growing Medium >6 in depth • Vegetation: – Sedum, Grasses, Native plants, shrubs, small trees • Higher Maintenance • Requires careful engineering – 50+ lbs per sq ft • Requires irrigation • Easier to install on new buildings • $25+ per sf, installed Green Roof, Washington, D.C. Shaw Nature Reserve, Native Green Roof
- 14. Why install green roofs? Benefits of Green Infrastructure
- 15. Why install green roofs? • Stormwater Benefits – Stormwater Runoff, Flash Flooding – Water Pollution • Other benefits – Urban Heat Island – Air Pollution – Biodiversity (plants, insects, birds) – Combat “Nature Deficit Disorder” – Grow food! – Educational Benefits • Outdoor Classroom
- 16. Stormwater Benefits Natural Hydrology Modified from http://www.epa.gov/hiri/resources/pdf/BasicsCompendium.pdf
- 17. Stormwater Benefits Altered Hydrology Rooftops Roads Parking Lots Compacted Soils
- 18. Stormwater Benefits Surface Runoff and Pollution • Urban runoff can impair water quality – Road grime washes into streams, often untreated! – Unsafe to swim or fish – Stormwater from warm urban areas can cause stream temperatures to RISE – Impact fish, insects, and plants OLDER SOLUTIONS: Quickly Drain the Stormwater • Channelize Waterways – River Des Peres • Stormwater Sewers – Combined Wastewater & Stormwater sewers Down the drain… PROBLEMS: • Concentrated Pollution channels • Biodiversity Loss • Combined Sewer Overflows • Basement Backups
- 19. Stormwater Benefits Utilizing Plants Plants do an amazing job handling rainwater! – They intercept rainfall – Plants can store water for use during dry conditions – Plants can uptake, use, and evapotranspire water – Plants also uptake, store, and remediate pollution – Leaves, stems, and roots slow stormwater runoff Cactus, on a green roof, stores water SOLUTIONS: • Retention/detention basins • Constructed wetlands • Grass swales • Rain Gardens Re-establish natural hydrology PROBLEMS: • Lack of space • High property value • Cost of implementing BMPs
- 20. Addressing stormwater with green roofs • Stormwater Runoff Reduction – 100% during light precipitation – Intensive 65-94% runoff reduction – Extensive 45-90% runoff reduction – Green roof slope decreases retention • Delay runoff – Delay runoff by 1 to 10 minutes – Delaying flash flooding – Store water for irrigation • Cisterns, rain barrels Sloped Green Roof, California SIUe
- 21. Other Benefits: Urban Heat Island Effect Up to 5-7 degrees hotter! CONTRIBUTORS – Roads, parking lots, roof tops – Reduced vegetation – Reduced blue space – Reduced wind – Anthropogenic heat sources • Industry, Automobiles, HVAC, etc. GREEN ROOFS – Reflect more sunlight than blacktop roofs – Shade the building roof – Provide extra insulation • Reduce AC use, minimizing cost and pollution Modified from http://www.epa.gov/hiri/resources/pdf/BasicsCompendium.pdf Temperatures in urban areas are generally higher than temperatures in surrounding rural areas.
- 22. Other Benefits: Economic COST BENEFIT ANALYSIS: Green Roof vs Black Roof • The longevity of green roofs = savings factor • Installation and maintenance = cost factor • Fewer floors a building = greater energy savings • More surface area= greater stormwater management savings • Cost savings will increase as: – Stormwater regulations become more stringent and – Green roofs become more acceptable as mitigation measures
- 23. Other Benefits • Air Pollution • Biodiversity (plants, insects, birds) • Combat “Nature Deficit Disorder” • Urban Agriculture • Educational Benefits – Outdoor Classroom Canada Goose Nesting https://www.flickr.com/photos/sbwoodside/with/501104668
- 24. Feasibility of green roofs at schools 1. Define Goals/Purpose 2. Budget, for installation and maintenance 3. Green roof selection
- 25. Feasibility: Goals and Purpose 1. Reduce Stormwater Runoff 1. Intensive=75% retention 2. Extensive=45% retention 3. Stormwater/sewer fees or incentives 4. Plants affect performance 2. Improve water and air quality 1. Plants Selected affect performance 3. Increase biodiversity 1. Extensive < intensive 2. Native Plants 3. Pollinating insects, nesting birds 4. Outdoor classroom 1. Will it be accessible or at least viewable? 2. Outdoor Lab, or just outdoor learning 3. Safety! 5. Grow food 1. Another opportunity to learn about gardening
- 26. Feasibility: Budget 1. Installing Green Roofs 1. Intensive= $25+ per sq ft 2. Extensive= $10-15 per sq ft 3. Stormwater/sewer rebates 4. Gov’t incentives 2. Remember the maintenance 1. Extensive green roofs are cheaper to maintain! 2. $0.75–$1.50 per square foot, per year 3. Cost/Benefit 1. Outdoor Classroom 1. Vs field trip costs 2. Design to last 2x longer than a conventional roof 3. Reduced Stormwater Fees 4. Energy cost reduction
- 27. Feasibility: Select Green Roof System 1. Consult Engineers 1. For new construction 2. For retrofits 2. Consult Horticulturists 3. Choose a product that matches your goals and your budget 4. Green Roof Installers 1. Regional/Local 2. Provide Maintenance Expertise
- 28. Places to see Green Roofs A few from the St. Louis area
- 29. Places to see Green Roofs St. Louis Zoo, River’s Edge Exhibit
- 30. Places to see Green Roofs Southern Illinois University Edwardsville, Student Success Center Numerous Green Roof and Green Wall Projects
- 31. Places to see Green Roofs Shaw Nature Reserve, Near Bascom House
- 32. Places to see Green Roofs National Great Rivers Research and Educational Center Alton, IL
- 33. Resources • Green Roofs, EPA. http://www.epa.gov/heatisland/mitigation/greenroofs.htm • Green Infrastructure, EPA http://water.epa.gov/infrastructure/greeninfrastructure/index.cfm • Low Impact Development, EPA http://water.epa.gov/polwaste/green/index.cfm • Green Roofs 101, GreenRoofs.com http://www.greenroofs.com/Greenroofs101/index.html • Cost Benefit Analysis, Green Roofs, GSA http://www.gsa.gov/portal/mediaId/167839/fileName/Cost_Benefit_Analysis.action • Green Roof Resources (for Teachers) http://teachers.egfi-k12.org/green-roof-resources/
Editor's Notes
- Technological and engineering feat! Bringing nature to the built environment.
- EX: St. Charles County Urban Space 1982: 3.4% 2003: 27.3% Stormwater Runoff: Increased by 70%
- IMPACTS Elevated temperature Increased energy use for air conditioning Development of secondary air pollutants Public health hazards
- Over a 50-year period, stormwater, energy, equivalent carbon dioxide and community earnings of green roofs more than made up for the increased premium of installing, maintaining and replacing them.