4.1.8.11.may be used for structures that meet any of the following criteria:

(a) where the Seismic Category is SC1 or SC2,
  (b) regular structures that are less than 60 m in height and have a fundamental lateral period, T a, less than 2 s in each of
        two orthogonal directions as defined in Article 4.1.8.8., or
  (c) structures with a structural irregularity of Type 2, 3, 4, 5, 6 or 8 as defined in Table 4.1.8.6. that are less than 20 m in
        height and have a fundamental lateral period, Ta, less than 0.5 s in each of two orthogonal directions as defined in
        Article 4.1.8.8.

This provision includes a table — formatting is preserved from the source; refer to the official code for the authoritative layout.

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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.