OBC Sheathing Attachment and Steel Stud Standards | empcontracting.ca Inc.
Sarah's Expert Insight
OBC Compliance Specialist
"In the variable climates of London and Oakville, adhering to the 2mm expansion gap for panel-type sheathing is the difference between a flat wall and wavy siding. As a senior consultant at empcontracting.ca Inc., I emphasize that these small mechanical details in steel stud and sheathing attachment are what prevent costly moisture ingress and structural shifting in Muskoka's high-exposure environments."
Ontario Building Code: Sheathing and Cladding Attachment
Properly securing the building envelope is critical for long-term durability. According to Section 9.23.17.3, materials such as gypsum sheathing, rigid insulation, and fibreboard must never be used as the primary attachment point for siding. Instead, fasteners must meet specific dimensions, including a minimum 3.2 mm diameter and an 11 mm head diameter to ensure stability.
Lumber and Panel-Type Sheathing Requirements
Under OBC 9.23.17.4 and 9.23.17.5, lumber wall sheathing requires all ends to be supported and joints to be staggered when used for bracing. For modern panel-type materials like plywood, OSB, or waferboard, a minimum 2 mm gap is mandatory between sheets to account for material expansion and contraction.
Non-Loadbearing Steel Stud Wall Framing
Section 9.24 provides the framework for sheet steel stud applications in non-loadbearing walls. These components must conform to AISI S201 standards. At empcontracting.ca Inc. your construction contractor in London, Ontario, we ensure that every screw and runner meets the ASTM C954 and minimum base steel thickness requirements for maximum structural integrity.
Mansard Style Roof Framing
When dealing with the vertical framing members of vented mansard roofs, the code requires them to be treated with the same rigor as exterior wall studs, adhering to the moisture and weather protection standards found in Articles 9.27.3.2. to 9.27.3.6.
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.