Green Roofs

Green Roof Construction Standards

Whether constructing a green roof voluntarily, or as required by the Green Roof Bylaw, all green roofs in the City of Toronto, at a minimum, must conform to the Toronto Green Roof Construction Standard. The Standard can be found in Article IV of the Green Roof Bylaw (Municipal Code Chapter 492, Green Roofs). It complements the other sections of the Green Roof Bylaw which relate to definitions, coverage requirements, exemptions, and applications etc.

The purpose of the Toronto Green Roof Construction Standard is to govern the design and construction of green roofs by setting out minimum requirements that meet the City's objectives and the Ontario Building Code requirements.

Mandatory provisions are included in the Toronto Green Roof Construction for the following areas:

  • Green Roof Assembly
  • Gravity Loads
  • Slope Stability
  • Parapet Height and /or Overflow Scupper Locations
  • Wind Uplift
  • Fire Safety
  • Occupancy and Safety
  • Waterproofing
  • Drainage
  • Water Retention
  • Vegetation Performance
  • Plant Selection
  • Irrigation
  • Maintenance

Green Roofs and Building Permits

As of January 31, 2010, the Toronto Green Construction Standard applies to all new building permit applications where a green roof is proposed.

There are no additional fees for a building permit to construct a green roof that is part of an application for a new building or an addition to an existing building. A separate fee is charged for a permit to construct a stand-alone green roof.

Tools:

PAL/PPR Project Reviews
While not specific to green roof programs, these services can help identify at the pre-application stage whether a green roof may be required as part of a development construction project.

Green Roof Bylaw Screening Form
The Green Roof Bylaw Screening Form is a diagnostic tool to help determine whether the Green Roof Bylaw may apply to your application and if any proposed Green Roof meets the requirement of the Bylaw. The form is not required as part of a building permit or site plan application, but assists both applicants and city staff in reviewing the project.

Green Roof Designer Checklist
The Green Roof Designer Checklist is a voluntary tool to assist designers in reviewing green roof projects by providing a summary of Ontario Building Code and Green Roof By-law provisions. The form is not required as part of a building permit.

Submittals:

Green Roof Statistics Template
The Green Roof Statistics Template is required to be submitted for Site Plan Control Applications or Building Permit applications (where no site plan application is required) where a green roof is mandatory. The table must be completed and copied directly onto the Roof Plan submitted.

Green Roof Declaration Form
The Green Roof Declaration Form is required to be submitted for all new buildings or building additions applications with a gross floor Area exceeding 2000 m², or where a green roof is proposed to be constructed.

Green Roof Inspection Report - Checklist
The Inspection Report Checklist is required to be submitted upon completion of the installation of the green roof to verify that the installation conforms to the Toronto Green Roof Construction Standard: Mandatory Provisions.

For additional information on how the Toronto Green Roof Construction Standard may apply to your project, please contact the Toronto Building Customer Service Counter closest to you.

For additional information on how the Toronto Green Roof Construction Standard may apply to your project, please contact the Toronto Building Customer Service Counter closest to you.

Toronto Green Roof Construction Standard: Supplementary Guidelines
Toronto Building has prepared a guideline document to the green roof construction standard, in consultation with the City's Green Roof Technical Advisory Group. The document contains "best practices" in green roof design, provides designers and the public with additional information on the Toronto Green Roof Construction Standard and contains illustrations to assist with calculating required green roof coverage.

Questions and Answers

For general information on the Toronto Green Roof Construction Standard, please contact Dylan Aster, Technical Advisor, Office of the Chief Building Official, Toronto Building, at (416) 338-5737 or daster@toronto.ca
 


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