The Ontario Building Code | Straight and Curved Runs in Stairs

9.8.3.1. Straight and Curved Runs in Stairs

(1) Except as provided in Sentence (2), stairs shall consist of,

(a) straight-runs, or

(b) curved-runs.

(2) Stairs within dwelling units shall consist of,

(a) straight-runs,

(b) curved-runs,

(c) straight-runs with winders, or

(d) straight-runs with curved-runs.