1. Green Roof CDAE 170

2. What’s been done? Green roofs in Iceland, 1800’s Green roofs in Iceland, 1800’s Technology in Germany 1970’s Technology in Germany 1970’s American Hydrotech Inc, American Wick Drain Corporation, etc. American Hydrotech Inc, American Wick Drain Corporation, etc. Toronto City Hall, 2000 Toronto City Hall, 2000

3. Advantages Ecological Ecological – Storm water control and treatment –Reduce urban heating –Filter airborne toxins Economic Economic –Natural Insulation –Useful Space Aesthetic Aesthetic Psychological Psychological

4. EXTENSIVE GREEN ROOF Thin growing medium; little or no irrigation; stressful conditions for plants; low plant diversity. Advantages: Lightweight. Suitable for large areas. Low maintenance Often no need for irrigation Often suitable for retrofit projects. Can leave vegetation to grow spontaneously. Relatively inexpensive. Easier for planning authority to demand as a condition of planning approvals. Disadvantages: Less energy efficiency and storm water retention benefits. More limited choice of plants. Usually no access for recreation or other uses. Unattractive to some, especially in winter. Extensive verse Intensive Green Roof INTENSIVE GREEN ROOF Deep soil; irrigation system; more favorable conditions for plants; high plant diversity; often accessible. Advantages: Greater diversity of plants and habitats. Good insulation properties. Can be made very attractive visually. Often accessible, with more diverse utilization of the roof. i.e. for recreation, growing food, as open space. More energy efficiency and storm water retention capability. Disadvantages: Greater weight loading on roof. Need for irrigation and drainage systems requiring energy, water, materials. Higher capital & maintenance costs. More complex systems and expertise.

5. Green Roof Construction Intensive Soil Substrate Fleece Filter Fabric Screen “Optima Perlite” Drainage Layer Rainwater Retention Layer Insulation Layer Root Barrier Course Waterproof Membrane Protective Barrier

6. Agriculture and Bioproduction Apples, bananas, cherries, raspberries, blueberries, tomato, peppers, spices and herbs Apples, bananas, cherries, raspberries, blueberries, tomato, peppers, spices and herbs Flowers and decorative plants Flowers and decorative plants Native species to replant in surrounding areas Native species to replant in surrounding areas

7. Conclusion Economic Economic Ecological Ecological Aesthetic Aesthetic Physological Advantages Physological Advantages Food production opportunity Food production opportunity