OBC DIVISION B · PART 4 — STRUCTURAL DESIGNUpdated for the 2024 Ontario Building Code
Try BUILDAiD Beta
Section 4.3 — Design Requirements for Structural
Full text of Section 4.3 (Design Requirements for Structural) — Division B, Part 4 (Structural Design) of the 2024 Ontario Building Code, with every article reproduced below.
4.3.1.Wood
4.3.1.1.Design Basis for Wood permalink →
(1) Buildings and their structural members made of wood shall conform to CSA O86, “Engineering design in wood.”
4.3.1.2.Glue-Laminated Members permalink →
(1) Glued-laminated members shall be fabricated in plants conforming to CSA O177, “Qualification Code for
Manufacturers of Structural Glued-Laminated Timber.”
4.3.1.3.Termites permalink →
(1) In areas known to be infested by termites, the requirements in Articles 9.3.2.9., 9.12.1.1. and 9.15.5.1. shall apply.
4.3.2.Plain and Reinforced Masonry
4.3.2.1.Design Basis for Plain and Reinforced Masonry permalink →
(1) Buildings and their structural members made of plain and reinforced masonry shall conform to CSA S304, “Design
of masonry structures.”
4.3.3.Plain, Reinforced and Pre-stressed Concrete
4.3.3.1.Design Basis for Plain, Reinforced and Pre-stressed Concrete permalink →
(1) Buildings and their structural members made of plain, reinforced and pre-stressed concrete shall conform to
CSA A23.3, “Design of concrete structures.” (See Note A-4.3.3.1.(1))
4.3.4.Steel
4.3.4.1.Design Basis for Structural Steel permalink →
(1) Buildings and their structural members made of structural steel shall conform to CSA S16, “Design of steel
structures.” (See Note A-4.3.4.1.(1))
4.3.4.2.Design Basis for Cold-Formed Steel permalink →
(1) Buildings and their structural members made of cold-formed steel shall conform to CSA S136, “North American
Specification for the Design of Cold-Formed Steel Structural Members (using the Appendix B provisions applicable to
Canada).” (See Note A-4.3.4.2.(1))
4.3.4.3.Steel Building Systems permalink →
(1) Steel building systems shall be manufactured by companies certified in accordance with the requirements of
CSA A660, “Certification of manufacturers of steel building systems.”
4.3.5.Aluminum
4.3.5.1.Design Basis for Aluminum permalink →
(1) Buildings and their structural members made of aluminum shall conform to CSA S157/S157.1, “Strength design in
aluminum/Commentary on CSA S157-17, Strength design in aluminum,” using the loads stipulated in Section 4.1., in
accordance with limit states design in Subsection 4.1.3.
4.3.6.Glass
4.3.6.1.Design Basis for Glass permalink →
(1) Glass used in buildings shall be designed in conformance with
(a) CAN/CGSB-12.20-M, “Structural Design of Glass for Buildings,” using an adjustment factor on the wind load, W,
of not less than 0.75, or
(b) ASTM E1300, “Standard Practice for Determining Load Resistance of Glass in Buildings,” using an adjustment factor
on the wind load, W, of not less than 1.0.
(See Note A-4.3.6.1.(1))
Understand any provision in seconds
BUILDAiD Assist explains any article of the building code in plain English — with exact citations, exceptions and related requirements.
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.