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

9.13.3.4.Application of Waterproofing Membranes

(1) Unless otherwise stated in this Subsection, waterproofing shall be installed in accordance with the manufacturer’s instructions with regard to (a) surface priming, (b) conditions during application, (c) the required number of layers of reinforcing fabric on foundations, footings, floors, walls and structural slabs, (d) application quantity and rate, and (e) curing times. (2) Waterproofing shall be continuous across joints and at junctions between different building elements. (3) The waterproofed surface shall be protected with a suitable material to minimize mechanical damage during backfilling. (4) The area in which the waterproofing is to be carried out shall be kept free of water during the application and curing of the waterproofing system.
← Previous9.13.3.3. Preparation of SurfaceNext →9.13.3.5. Floor Waterproofing System

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.