2024 Ontario Building Code Guide: SPF No. 2 Exterior Wall Stud Sizes & Spacing
Sarah's Expert Insight
OBC Compliance Specialist
"In high-snow regions like Muskoka, we often see requirements shift to 'Type C' double-studding for taller wall heights to manage the 3.0 kPa snow load threshold. For our clients in London and Oakville, paying close attention to the 0.60 kPa wind pressure column is critical for coastal or open-field exposures to ensure the structural skeleton of the home exceeds local safety margins."
When planning a residential or small commercial build, adhering to the 2024 Ontario Building Code (OBC) standards for structural framing is non-negotiable. As empcontracting.ca Inc. your construction contractor in London, Ontario, we utilize Table 9.23.10.1.-B to determine the precise requirements for Spruce-Pine-Fir (SPF) No. 2 grade exterior wall studs when using siding.
Understanding Table 9.23.10.1.-B Requirements
This section of the OBC specifies how wind pressure and snow loads dictate the spacing and size of your wall supports. For most standard builds, the code provides a clear roadmap based on the height of the wall and the length of the roof it supports.
The Stud Spacing Legend
- A: 38 × 140 mm at 400 mm on centre
- B: 38 × 140 mm at 300 mm on centre
- C: Two 38 × 140 mm studs at 400 mm on centre
- D: Two 38 × 140 mm studs at 300 mm on centre
Critical Load Factors
The table is divided by Hourly Wind Pressure (1/50) and Specified Roof Snow Load. As the stud length increases (up to 5.6m) or the snow load increases (up to 3.0 kPa), the required spacing must become tighter (moving from 'A' to 'B') or the studs must be doubled (moving to 'C').
Important Limitations
It is vital to note that these calculations assume a roof dead load of 0.5 kPa. If your project in London, Oakville, or Muskoka involves heavy roofing materials such as concrete or clay tiles, this table no longer applies, and specialized engineering is required per Sentence 9.23.10.1.(2).
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.