The Ontario Building Code | Exterior Concrete Stairs
9.8.9.2. exterior Concrete Stairs
(1) exterior concrete stairs with more than two risers and two treads shall be,
(a) supported on unit masonry or concrete walls or piers not less than 150 mm in cross-section, or
(b) cantilevered from the main foundation wall.
(2) Stairs described in Sentence (1), when cantilevered from the foundationwall, shall be constructed and installed in conformance with Subsection 9.8.10.
(3) The depth below ground level for foundations for exterior steps shall conform to the requirements in Section 9.12.
In Plain Language
Exterior concrete stairs have specific construction requirements set out in this article, addressing durability and drainage in an outdoor, weather-exposed setting.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.