Ontario Building Code Roofing Standards: Shingle Installation Guide by empcontracting.ca Inc. in London, Ontario
Sarah's Expert Insight
OBC Compliance Specialist
"Properly securing shingle courses and ridges is critical in high-wind areas like London and Muskoka to prevent lift and water ingress during heavy storms. As your construction contractor in London, Ontario, empcontracting.ca Inc. prioritizes these specific cement application rates and staggering techniques to ensure your roof reaches its full lifespan despite our province's volatile freeze-thaw cycles."
Understanding the intricacies of the Ontario Building Code (OBC) is essential for any durable roofing project. Whether you are installing asphalt tabs or premium wood shingles, empcontracting.ca Inc. your construction contractor in London, Ontario, ensures your home meets all safety and performance standards.
OBC 9.26.8: Securing Asphalt Shingle Tabs and Courses
Proper adhesion is the first line of defense against Ontario’s harsh weather. The OBC dictates specific application rates for roofing cement to prevent wind lift.
Securing Tabs and Courses
- Tab Securing: Shingle tabs must be secured with cold application cement (0.5 L/m²) or hot application asphalt (1 kg/m²).
- Course Application: The first course requires a continuous band of cement along the eaves (exposure width plus 100 mm). Successive courses require a band equal to the exposure plus 50 mm.
Hips, Ridges, and Flashing
For hips and ridges, shingles must be at least 300 mm wide and applied to provide triple coverage. These must be cemented and fastened with nails or staples 40 mm above the butt and 50 mm from each edge to ensure a watertight seal. All flashing must conform to Subsection 9.26.4 of the code.
OBC 9.26.9: Wood Roof Shingle Requirements
Wood shingles offer a classic aesthetic, but they require precise installation to manage moisture and expansion.
Material Grades and Sizing
The code specifies that Western Cedar shingles must be at least No. 2 grade, while Eastern White Cedar must be B (clear) grade or higher. Shingles must be at least 400 mm long, with widths ranging between 75 mm and 350 mm.
Installation and Spacing
To allow for natural expansion, shingles should be spaced approximately 6 mm apart. Joints must be offset by at least 40 mm in adjacent courses to ensure that alternate course joints are staggered, preventing direct water penetration to the roof deck.
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.