Construction codes of Ontario

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Levelling of Sill Plates

Levelling of Sill Plates (1) Sill plates shall be, (a) levelled by setting them on a full bed of mortar, or (b) laid directly on the foundation where the top of the foundation is level. (2) The joint between the sill plate for exterior walls and the foundation shall be sealed in accordance with Subsection […]

Lintel Support Over Openings

Lintel Support Over Openings (1) Logs placed in vertical position shall be supported over window and door openings by lintels meeting the requirements of Tables A-12 to A-16. Article 9.37.3.1 Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only. Note : A lintel is a type of beam (a horizontal structural […]

Location and Attachment of Rafters

Location and Attachment of Rafters (1) Rafters shall be located directly opposite each other and tied together at the peak, or may be offset by their own thickness if nailed to a ridge board not less than 17.5 mm thick. (2) Except as permitted in Sentence (3), framing members shall be connected by gusset plates or nailing […]

Location of Flashing

Location of Flashing (1) Flashing shall be installed in masonry and masonry veneer walls, (a) beneath jointed masonry window sills, (b) over the back and top of parapet walls, (c) over the heads of glass block panels, (d) beneath weep holes, and (e) over the heads of window and door […]

Low-Slope Roof

Low-Slope Roof Low-slope roofs must be constructed more water-tight than pitched roofs because drainage is poorer. They sometimes support decks or terraces or occasional traffic and therefore must be protected with durable, wear-resistant materials. Where rafters also serve as ceiling joists, the term “roof joist” is used. Their size is determined by both roof and […]

Lumber Grades

Lumber Grades Each piece of construction lumber is examined and assigned a grade depending on its physical characteristics such as the size and location of knots and the slope of the grain. The assigned grade is an estimate of its strength. Softwood lumber species having similar strength properties may be combined into a single-species combination […]

Lumber Roof Sheathing Width

Lumber Roof Sheathing Width (1) Lumber roof sheathing shall not be more than 286 mm wide and shall be applied so that all ends are supported with end joints staggered Article 9.23.15.5. Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only.