S-2.1, r. 4 - Safety Code for the construction industry
3.6.4. Temporary stairs: (1) Outside of buildings, temporary stairs shall have:
(a) steps with a width of at least 500 mm;
(b) a maximum slope of 55º;
(c) landings with a depth of at least 500 mm;
(d) a handrail; and
(e) uniform steps in the same flight.
(2) Inside buildings, temporary stairs shall have a width of at least 750 mm or at least equal to that of the permanent stairs to be installed.
R.R.Q., 1981, c. S-2.1, r. 6, s. 3.6.4.