The Ontario Building Code | Floors of Exterior Passageways
188.8.131.52. floors of exterior Passageways
(1) Except as provided in Sentences (2) and (3), the floor assembly of every exterior passageway used as part of a means of egress shall have a fire-resistance rating of not less than 45 min or be of noncombustible construction.
(2) Nofire-resistance rating is required for floors of exterior passageways serving buildings of Group D, E or F major occupancy that are not more than 2 storeys in building height.
(3) Nofire-resistance rating is required for floors of exterior passageways serving a single dwelling unitwhere no suite is located above or below the dwelling unit.
Note: On July 1, 2017, Sentence 184.108.40.206.(3) of Division B of the Regulation is revoked and the following substituted: (See: O. Reg. 139/17, s. 100)
(3) No fire-resistance rating is required for floors of exterior passageways serving,
(a) a houseor an individual dwelling unit in a house, or
(b) an individual dwelling unit in a buildingother than a house where no suiteis located above or below the dwelling unit.