![]() ![]() The City of Toronto has a bylaw to require the construction of green roofs on most types of new building development. ![]() Green roofs also provide an opportunity to create habitat and enhance biodiversity in the urban fabric of the City. They help reduce the effects of the urban heat island and associated energy use, manage stormwater runoff (reducing the pollutants that enter our waterways), improve air quality and beautify our city. Sources/Resources 24 Appendix A: Recommended Plant Species 25 Appendix B: Plant Species to Avoid 33 Appendic C: Plants used by Butterflies and Caterpillers 35ġ.0 Introduction and Background Green roofs have many environmental benefits. Opportunities and Constraints 8 3.1 Extensive and Intensive 8 3.2 Roof Types 10 3.3 Native Vs Non Native 10 3.4 Invasive Species 10Ĥ.0 Design Guidelines 11 4.1 Design Factors 11 4.1.1 Depth, Topography and Composition of Growing Media 11 4.1.2 Vegetation Diversity 11 4.1.3 Structures 12 4.2 Design Strategies 13 4.2.1 Increase Depth of Growing Media 13 4.2.2 Vary Composition (Structure) of Growing Media 13 4.2.3 Provide Topographic Variety 13 4.2.4 Provide Microclimates 14 4.2.5 Diversify Plant Species 14 4.2.6 Provide Perching Habitat 14 4.2.7 Provide Nesting Opportunities 15 4.2.8 Provide Water Source(s) 15 4.3 Design Analogues 16 4.3.1 Recreate Native Landscapes 16 4.3.2 Design to Attract Specific Fauna 19 4.3.3 Design to Support Adjacent Ecosystems 22 TORONTO CITY PLANNING ZONING BYLAW AND ENVIRONMENTAL PLANNINGĢ.0 Natural Heritage and Biodiversity Objectives 6 3.0 Photographs: See individual photographs Design and Layout: Graphics and Visualization, Urban Design, Toronto City Planning Divison 2013 DESIGN GUIDELINES FOR BIODIVERSE GREEN ROOFSĪcknowledgements: Prepared by: Scott Torrance Landscape Architect Inc., with: Brad Bass, Scott MacIvor and Terry McGlade, in conjunction with Toronto City Planning Division Illustrations: Grace Yang, Scott Torrance Landscape Architect Inc. ![]()
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