2024 OBC Table 9.23.12.3.-D: Glued-Laminated Timber Lintel Spans for Ontario Builders
Sarah's Expert Insight
OBC Compliance Specialist
"As a senior consultant at empcontracting.ca Inc., your construction contractor in London, Ontario, I find that Table 9.23.12.3.-D is a game-changer for the 'Great Room' designs popular in Oakville and Muskoka. In high snow-load areas like Muskoka, correctly interpolating these 20f-E stress grades allows us to maximize glass frontage while maintaining the 89mm bearing minimum required by the 2024 OBC."
Understanding the 2024 Ontario Building Code (OBC) is essential for ensuring the structural integrity of residential and commercial projects. Table 9.23.12.3.-D provides critical data for the maximum spans of 20f-E Stress Grade Glued-Laminated (Glulam) timber lintels used in exterior walls supporting roof and ceiling loads only.
Overview of Glulam Lintel Maximum Spans
Glulam lintels are a preferred choice for empcontracting.ca Inc. your construction contractor in London, Ontario, when designing wide-span openings like patio doors or large window banks. This table dictates the allowable distance a beam can span based on the specified snow load and the supported length of the roof trusses.
Critical Specifications for 20f-E Stress Grade
- Specified Snow Loads: The table covers ranges from 1.0 kPa to 3.0 kPa, which are typical across Southern and Central Ontario.
- Lintel Sizes: Common depths range from 304 mm to 532 mm, with widths of either 80 mm or 130 mm.
- Supported Lengths: Calculations are based on supported lengths of 2.4 m, 3.6 m, and 4.8 m (defined as half the length of the trusses plus the overhang).
Important Compliance Notes
According to the 2024 Compendium, all Glulam must conform to CAN/CSA-O122 and CSA O177 standards. A minimum bearing length of 89 mm is required at each end unless calculated otherwise under Part 4. Additionally, builders must ensure the top edge of the lintel is fully laterally supported to prevent rotation or buckling under load.
For professional framing and structural installations that meet these rigorous standards, trust empcontracting.ca Inc. your construction contractor in London, Ontario, to handle your next high-end build or renovation.
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.