Ontario Building Code Roofing Standards: Expert Guide by empcontracting.ca Inc.
Sarah's Expert Insight
OBC Compliance Specialist
"In high-wind areas like London and snow-heavy regions like Muskoka, the precision of fastener selection and roof slope is the difference between a resilient roof and a catastrophic failure. At empcontracting.ca Inc., we emphasize that using specific corrosion-resistant nails and ensuring proper back-slope drainage are non-negotiable steps for withstanding the Ontario climate and protecting your investment."
Roofing Installation and Fastener Standards (OBC 9.26.2)
Compliance with the 2024 Ontario Building Code is mandatory for ensuring the durability of residential and commercial structures. As empcontracting.ca Inc. your construction contractor in London, Ontario, we ensure every project adheres to the specific installation requirements of Section 9.26.2.2, which mandates following manufacturer instructions to maintain warranty and safety standards.
Fastener Specifications for Asphalt and Wood Shingles
The OBC provides rigorous standards for fasteners to prevent shingle blow-offs and roof leaks. Nails used for roofing must be corrosion-resistant and of sufficient length to penetrate 12 mm into the roof sheathing. For asphalt shingles, nails require a minimum head diameter of 9.5 mm and a shank thickness of 2.95 mm. For wood shingles and shakes, the code is even stricter, requiring stainless steel, aluminum, or hot-dipped galvanized nails to prevent oxidation and staining.
Roof Slope and Moisture Management (OBC 9.26.3)
Proper roof slope is essential for effective water shedding and building envelope protection. OBC 9.26.3.1 outlines that while standard slopes are generally required, exceptions are made for profiled metal systems and gravel roofs if effective drainage is present at the lowest points. Crucially, the code requires roofs to be constructed with a sufficient slope away from exterior walls and guards to prevent water ingress, which is a leading cause of structural damage in Ontario homes.
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.