Code Library › Volume 1 › Section 9.13 — Dampproofing, Waterproofing and
PART 9 — HOUSING AND SMALL BUILDINGSUpdated for the 2024 Ontario Building Code

9.13.2.1.Required Dampproofing

(1) Except as provided in Sentence (4) and Article 9.13.3.1., where the exterior finished ground level is at a higher elevation than the ground level inside the foundation walls, exterior surfaces of foundation walls below ground level shall be dampproofed. (2) Except as provided in Sentence (3) and Article 9.13.3.1., floors-on-ground shall be dampproofed. (3) Floors in garages, floors in unenclosed portions of buildings and floors installed over granular fill in conformance with Article 9.16.2.1. need not be dampproofed. (4) Dampproofing in Sentence (1) is not required where the exterior surfaces of foundation walls below ground level are waterproofed.
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Common questions about this part of the code

When is waterproofing required instead of dampproofing for a foundation in Ontario?What are the radon and soil gas control requirements for new houses in Ontario?Does foundation dampproofing go on the inside or outside of the wall 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.