4.2.5.3.Supported Excavations

(1) The sides of an excavation in soil or rock shall be supported by a retaining structure conforming with the
     requirements of Articles 4.2.5.1. and 4.2.5.2., except as permitted in Article 4.2.5.4.

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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.