The Ontario Building Code | Maximum Vertical Rise of Stair Flights and Required Landings
188.8.131.52. Maximum Vertical Rise of Stair Flights and Required Landings
(1) No flight of stairs shall have a vertical rise of more than 3.7 m between floors or landings, except that a flight of stairs serving as an exit in a Group B, Division 2 or 3 occupancyshall have a vertical rise not more than 2.4 m between floors or landings.
(2) Except as provided by Sentence (3), a landing shall be provided,
(b) at the top and bottom of every section of ramp,
(c) where a doorway ="http://thehandyforce.com/doors/" title ="Toronto Door installer">doorway opens onto a stair or ramp,
(d) where a ramp opens onto a stair, and
(e) where a stair opens onto a ramp.
(a) the width of the stair or ramp, or
(b) 1 100 mm.