The Ontario Building Code | Structural Fire Protection
3.10.2.3. Structural Fire Protection
(1) Except as provided in Sentence (2) and Sentence 3.10.4.2.(1), the requirements in Subsections 3.2.1. and 3.2.2. shall apply.
(2) The first storey shall be subdivided into areas not more than 500 m2 by a masonry or reinforced concrete fire separation having a fire-resistance rating not less than 1 h, or it shall be sprinklered.
In Plain Language
Structural fire protection in self-service storage buildings generally follows the standard building-height-and-area rules, with the first storey needing to be subdivided into areas no larger than 500 square metres by a rated masonry or concrete 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.