PART 4 — STRUCTURAL DESIGNUpdated for the 2024 Ontario Building Code
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4.1.6.3.Full and Partial Loading
(1) A roof or other building surface and its structural members subject to loads due to snow accumulation shall be
designed for the specified load given in Sentence 4.1.6.2.(1), distributed over the entire loaded area.
(2) In addition to the distribution mentioned in Sentence (1), flat roofs and shed roofs, gable roofs of 15° slope or less,
and arch or curved roofs shall be designed for the specified uniform snow load indicated in Sentence 4.1.6.2.(1), which
shall be calculated using the accumulation factor Ca = 1.0, distributed on any one portion of the loaded area and half of
this load on the remainder of the loaded area, in such a way as to produce the most critical effects on the member
concerned. (See Note A-4.1.6.3.(2))
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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.