S-2.1, r. 4 - Safety Code for the construction industry

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3.6.2. Construction:
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.