Ontario Building Code - Section 336

3.3.4.2. 2024 Building Code Compendium 148 Division B – Part 3 (d) every door between the storage garage and the dwelling unit is (i) tight fitting and weather-stripped to provide an effective barrier against the passage of gas and exhaust fumes, (ii) fitted with a self-closing device, and (iii) not located in a room intended for sleeping. 3.3.4.3. Storage Rooms (1) Sprinklers shall be installed in a storage room provided for the use of tenants in a residential occupancy within a floor area but not contained within a suite. (2) Except as permitted by Sentence (3), a storage room referred to in Sentence (1) shall be separated from the remainder of the building by a fire separation having a fire-resistance rating not less than 1 h. (3) The fire-resistance rating of the fire separation required by Sentence (2) is permitted to be less than 1 h but not less than 45 min provided the fire-resistance rating required by Subsection 3.2.2. is permitted to be less than 1 h for (a) the floor assembly above the floor area, or (b) the floor assembly below the floor area, if there is no floor assembly above. (4) Except where located within a dwelling unit, a room intended for the storage of flammable liquids or combustible liquids required by the Fire Code made under the Fire Protection and Prevention Act, 1997 shall not be located above or below the first storey of the building. 3.3.4.4. Egress from Dwelling Units (1) Except as required by Sentence (8), single storey dwelling units in an apartment building need not lead to a public corridor or exterior passageway on the same storey provided the dwelling units are served by private stairways leading directly to a public access to exit on the storey (a) immediately above, and (b) immediately below. (See Note A-3.3.4.4.(1)) (2) Except as required by Sentence (8) and as permitted by Sentences (3) and (4), a dwelling unit containing more than one storey shall have an exit door or an egress door opening directly into a public access to exit from the uppermost storey and from the lowest storey of the dwelling unit so that each of these storeys is served by an exit or egress door located not more than 1.5 m above or below its floor level. (3) A single exit is permitted from a dwelling unit provided the exit is an exterior doorway not more than 1.5 m above adjacent ground level and (a) it is not necessary to travel up or down more than one storey to reach the exit door, or (b) the uppermost floor level opens to a balcony not more than 6 m above adjacent ground level. (4) An egress door from either the uppermost storey or the lowest storey in a dwelling unit, as required by Sentence (2), need not be provided (a) except as required by Sentence (8), if that storey is served by a stairway that (i) leads to a public access to exit, (ii) has no direct access to any other storey in the dwelling unit, and (iii) is separated from the other storeys in the dwelling unit by a fire separation having a fire-resistance rating of not less than 45 min, (b) on the uppermost storey in the dwelling unit if the dwelling unit has not more than 2 storeys above the first storey of the building, (c) if it is not necessary to travel either more than 18 m or more than 1 storey up or down within the dwelling unit to reach the egress door, or (d) if that storey is (i) provided with a balcony conforming to Sentence (7), (ii) not more than 2 storeys above or below the dwelling unit egress door, and (iii) in a building that is not more than 6 storeys in building height.