Code Library › Volume 1 › Section 9.4 — Structural Requirements
PART 9 — HOUSING AND SMALL BUILDINGSUpdated for the 2024 Ontario Building Code

9.4.4.3.High Water Table

(1) Where a foundation bears on gravel, sand or silt, and the water table is within a distance below the bearing surface equal to the width of the foundation, the allowable bearing pressure shall be 50% of that determined in Article 9.4.4.1.
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When can you use Part 9 span tables instead of an engineer in Ontario?What design loads apply to houses under Part 9 in Ontario?What are the basic foundation design rules for houses in Ontario?

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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.