13. Height of means of egress: Any means of egress shall have a minimum headroom clearance of 1.90 m. This requirement does not apply to a doorway.
In the case of stairs, this distance shall be measured vertically above any landing or the nosing of any stair tread.
Moreover, where an obstacle reduces the headroom clearance of a means of egress within less than 2 m, such means of egress shall be indicated by numbers of a contrasting colour with lettering at least 114 mm in height and with lines at least 19 mm in width.
R.R.Q., 1981, c. S-3, r. 4, s. 13; O.C. 88-91, s. 12.