The Ontario Building Code | Floor Assemblies
9.10.9.4. floor Assemblies
(1) Except as permitted in Sentences (2) to (4), all floor assemblies shall be constructed as fire separations.
(2) floor assemblies contained within dwelling units need not be constructed as fire separations.
(3) floor assemblies for which no fire-resistance rating is required by Subsection 9.10.8. and floors of mezzaninesnot required to be counted as storeys in Articles 9.10.4.1. and 9.10.4.2. need not be constructed as fire separations.
(4) Where a crawl space is not required by Article 9.10.8.9. to be constructed as a basement, the floor above it need not be constructed as afire separation.
In Plain Language
Floor assemblies that form part of a fire separation must meet the requirements set out in this article, addressing their construction and continuity.
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.