Construction codes of Ontario

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Treads

(1) Stair Treads of lumber, plywood or O-2 grade OSB within dwelling units shall be not less than 25 mm actual thickness, except that if open risers are used and the distance between stringers exceeds 750 mm, the treads shall be not less than 38 mm actual thickness. (2) Stair treads of plywood or OSB, that are […]

Treads and Risers

Treads and Risers (1) Except as permitted for dwelling units and by Sentence 3.4.7.5.(1) for fire escapes, steps in flights shall have a run of not less than 280mm and not more than 355 mm between successive steps. (2) Steps referred to in Sentence (1) shall have a rise between successive treads not less than 125 […]

Uniformity and Tolerances for Risers and Treads

Uniformity and Tolerances for Risers and Treads (1) Except as provided in Sentence (2), risers shall be of uniform height in any one flight with a maximum tolerance of, (a) 5 mm between adjacent treads or landings, and (b) 10 mm between the tallest and shortest risers in a flight. (2) Except for required exit stairs, […]

Uniformity of Runs in Flights with Mixed Treads within a House or Dwelling Unit

Uniformity of Runs in Flights with Mixed Treads within a House or Dwelling Unit (1) Except as provided in Sentence (2) and Article 9.8.4.5., where a flight within a house or individual dwelling unit consists of both tapered treads and rectangular treads, all the treads shall have a uniform run when measured at a point 300 […]

Winders

(1) Stairs within dwelling units are permitted to contain winders that converge to a centre point provided, (a) the winders turn through an angle of not more than 90°, (b) individual treads turn through an angle of not less than 30° or not more than 45°, and (c) adjacent winders turn through the […]

Wooden Stair Stringers

(1) Wooden stair stringers shall, (a) have a minimum effective depth of 90 mm, measured perpendicularly to the bottom of the stringer at the point of minimum cross-section, and an overall depth of not less than 235 mm (b) be supported and secured top and bottom, (c) be not less than 25 mm […]