S-2.1, r. 4 - Safety Code for the construction industry
(1) Stairs and landings shall be designed and constructed to safely support a live load of 4.8 kN/m2.
(2) Stairs shall have:
(a) uniform treads and risers in any one flight;
(b) a vertical distance between landings or floors not exceeding 3.6 m;
(c) an angle of rise not exceeding 50º from the horizontal; and
(d) guardrails in accordance with Subdivision 3.8 and securely fastened and supported on the open sides of the stairs and landings.
R.R.Q., 1981, c. S-2.1, r. 6, s. 3.6.2.