Construction codes of Ontario

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Installation of Roofing Materials

Installation of Roofing Materials (1) Materials listed in Tables 9.26.2.1.A. and 9.26.2.1.B. shall be installed in conformance with the manufacturer’s instructions. Article 9.26.2.2. Ontario Regulation 332/12 Building Code, Information published by oncodes.ca for educational purposes only.

Installing Roof Sheathing

Installing Roof Sheathing When plywood or OSB is used for roof sheathing, sheets are laid with the face grain at right angles to the framing (Figure 97) and with the joints offset to obtain a good tie across the roof framing. Leave a 2 to 3 mm (1⁄8 in.) gap between panels to prevent buckling […]

Insulation of a Flat joist-type Roof Ceiling above the Sheathing

Insulation of a flat joist-type roof ceiling above the sheathing Another approach is to place the insulation above the sheathing, as is commonly done with low-slope roofs (Figure 27). Insulation exposed to the weather must be impermeable to moisture. Polystyrene insulation is commonly used on the outside of roof sheathing and protected by the roofing […]

Intermediate Support for Rafters and Joists

Intermediate Support for Rafters and Joists (1) Ceiling joists and collar ties of not less than 38 mm by 89 mm lumber are permitted to be assumed to provide intermediate support to reduce the span for rafters and joists where the roof slope is 1 in 3 or greater. (2) Collar ties referred to in Sentence […]

Intersection of Built-Up Roofs and Masonry

Intersection of Built-Up Roofs and Masonry (1) The intersection of built-up roofs with masonry walls or chimneys shall have a cant strip at the intersection and a roofing membrane shall be mopped over the cant strip and not less than 150 mm up the wall. (2) Counter flashing installed over the intersection referred to in Sentence (1) […]

Intersection of Built-Up Roofs and Walls other than Masonry

Intersection of Built-Up Roofs and Walls other than Masonry (1) The intersection of built-up roofs with walls clad with other than masonry shall have a cant strip at the intersection. (2) The roofing membrane shall be mopped over the cant strip referred to in Sentence (1). (3) Flashing plies shall extend not less than 150 mm up the […]

Intersection of Shingle Roofs and Masonry

Intersection of Shingle Roofs and Masonry (1) The intersection of shingle roofs and masonry walls or chimneys shall be protected with flashing. (2) Counter flashing required in Sentence (1) shall be embedded not less than 25 mm in the masonry and shall extend not less than 150 mm down the masonry and lap the lower flashing not […]