The Ontario Building Code | Rooftop Enclosures
3.2.2.14. Rooftop Enclosures
(1) A rooftop enclosure for elevator machinery or for a service room shall be constructed in accordance with the type of construction required by Articles 3.2.2.20. to 3.2.2.83.
(2) A rooftop enclosure for elevator machinery or for a service room, not more than 1 storeyhigh, is not required to have a fire-resistance rating.
(3) A rooftop enclosure for a stairway shall be constructed in accordance with the type of construction required by Articles 3.2.2.20. to 3.2.2.83.
(4) A rooftop enclosure for a stairway need not have a fire-resistance rating nor be constructed as a fire separation.
In Plain Language
Rooftop enclosures for elevator machinery or service rooms must match the building's required construction type, though single-storey enclosures don't need a fire-resistance rating; stairway rooftop enclosures follow the same construction-type rule but never need a rating or to be built as a fire separation.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.