2024 Ontario Building Code (OBC) Guide: Steel Stud Framing & Runner Requirements for London Construction
Sarah's Expert Insight
OBC Compliance Specialist
"As a senior consultant at empcontracting.ca Inc., your construction contractor in London, Ontario, I find that many DIY projects fail code inspections in the Oakville and Muskoka areas specifically because of improper runner flange depth. Adhering to the 30mm flange minimum and matching runner-to-stud thickness is vital for maintaining wall alignment and preventing drywall cracking in high-end residential finishes."
Introduction to Steel Stud Framing Standards
Understanding the 2024 Ontario Building Code (OBC) is essential for any high-quality renovation or new build. As empcontracting.ca Inc. your construction contractor in London, Ontario, we ensure every project adheres to the rigorous standards of Part 9 of the OBC to guarantee safety and structural integrity.
9.24.1.5. Cladding, Sheathing, and Interior Finish Requirements
Fastener Specifications and Installation
According to OBC 9.24.1.5, all cladding, sheathing, and interior finishes installed on steel stud framing must be fastened with screws that comply with ASTM C1002. These fasteners must:
- Be spaced according to the descriptions found in Section 9.29.
- Penetrate no less than 10 mm through the metal framing to ensure maximum pull-out resistance.
9.24.2. Size and Spacing of Studs in Interior Walls
Table 9.24.2.1: Non-Loadbearing Wall Constraints
For non-loadbearing interior walls, the OBC specifies strict height-to-spacing ratios. For example, a standard 32 x 89 mm stud can reach a maximum height of 5.2 meters when spaced at 300 mm, but only 3.9 meters when spaced at 600 mm. These values assume a single layer of 12.7 mm gypsum panel sheathing is installed on both sides.
9.24.2.2 & 9.24.2.3. Thickness and Runner Specifications
Minimum Metal Thickness
The OBC requires that steel studs in non-loadbearing interior walls have a metal thickness of not less than 0.46 mm. This ensures the frame has the necessary rigidity to support interior finishes without bowing.
Runner Requirements
Section 9.24.2.3 mandates that runners for both interior and exterior non-loadbearing walls must:
- Have a thickness not less than the corresponding studs.
- Feature flanges of at least 30 mm in depth.
Partnering with empcontracting.ca Inc. your construction contractor in London, Ontario, ensures that these technical specifications are handled with professional precision.
Disclaimer: This content is generated from the Ontario Building Code for educational purposes. Always consult with a licensed professional engineer or your local building department before starting any construction project in London, Ontario.