Minimum Depth of Foundations
(1) Except as provided in Sentences (4) to (7), the minimum depth of foundations below finished ground level shall conform to Table 9.12.2.2.
(2) Where a foundation is insulated in a manner that will reduce the heat flow to the soil beneath the footings, the foundation depth shall conform to that required for foundations containing no heated space.
(3) The minimum depth of foundations for exterior concrete steps with more than 2 risers shall conform to Sentences (1), (2) and (5).
(4) Concrete steps with 1 and 2 risers are permitted to be laid on ground level.
(5) The foundation depths required in Sentence (1) are permitted to be decreased where experience with local soil conditions shows that lesser depths are satisfactory, or where the foundation is designed for lesser depths.
(6) The foundation depths required in Sentence (1) do not apply to foundations for,
(a) buildings,
(i) that are not of masonry or masonry veneer construction, and
(ii) whose superstructure conforms with the requirements of the deformation resistance test in CSA Z240.2.1, “Structural Requirements for Manufactured Homes”, or
(b) accessory buildings,
(i) that are not of masonry or masonry veneer construction,
(ii) not more than 1 storey in building height,
(iii) not more than 55 m² in building area, and
(iv) where the distance from the finished ground to the underside of the floor joists is not more than 600 mm.
(7) The foundation depths required in Sentence (1) do not apply to foundations for decks and other accessible exterior platforms,
(a) that are of not more than 1 storey,
(b) that are not more than 55 m² in area,
(c) where the distance from the finished ground to the underside of the floor joists is not more than 600 mm,
(d) that are not supporting a roof, and
(e) that are not attached to another structure, unless it can be demonstrated that differential movement will not adversely affect the performance of that structure.
Article 9.12.2.2 Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only.
