5.6.2.2.Accumulation and Disposal

(1) Where water, snow or ice can accumulate on a building, provision shall be made to minimize the likelihood of
  hazardous conditions arising from such accumulation.

  (2) Where precipitation can accumulate on sloped or horizontal assemblies, provision shall be made for drainage
  conforming with Section 7.4.

  (3) Where downspouts are provided and are not connected to a sewer, provisions shall be made to,
  (a) divert the water from the building, and
  (b) prevent soil erosion.

  (4) Junctions between vertical assemblies, and sloped or horizontal assemblies, shall be designed and constructed to
  minimize the flow of water from the sloped or horizontal assembly onto the vertical assembly.

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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.