PART 9 — HOUSING AND SMALL BUILDINGSUpdated for the 2024 Ontario Building Code
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9.3.1.1.General
(1) Except as provided in Sentence (2) and Articles 9.3.1.6. and 9.3.1.7., unreinforced and nominally reinforced
concrete shall be designed, mixed, placed, cured and tested in accordance with the requirements for “R” class concrete
stated in Section 9 of CSA A23.1, “Concrete materials and methods of concrete construction.”
(2) Unreinforced and nominally reinforced site-batched concrete shall be designed, mixed, placed and cured in
accordance with Articles 9.3.1.2. to 9.3.1.9.
(3) Except as provided in Sentence (4), Subsection 9.15.4. and Section 9.40., reinforced concrete shall be designed to
conform to the requirements of Part 4.
(4) For flat insulating concrete form walls not exceeding 2 storeys in building height and having a maximum floor to
floor height of 3 m, in buildings of light-frame construction, the concrete and reinforcing shall comply with Part 4 or
(a) the concrete shall conform to CSA A23.1, “Concrete materials and methods of concrete construction,” with a
maximum aggregate size of 19 mm, and
(b) the reinforcing shall,
(i) conform to CSA G30.18, “Carbon steel bars for concrete reinforcement”,
(ii) have a minimum specified yield strength of 400 MPa, and
(iii) be lapped a minimum of 450 mm for 10M bars and 650 mm for 15M bars. (See also Articles 9.15.4.5. and
9.20.17.2. to 9.20.17.4.)
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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.