(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 same angle.

    (2)  Where more than one set of winders described in Sentence (1) is provided in a single stairway between adjacent floor levels, such winders shall be separated in plan by at least 1 200 mm.


Article Ontario Regulation 332/12 Building Code,   Information published by oncodes.ca for educational purposes only.