The Ontario Building Code | Mezzanines
3.2.1.6. Mezzanines
(1) The floor assembly of a mezzanine that is required to be considered as a storey in calculating building height shall be constructed in conformance with the fire separation requirements for floor assemblies in Articles 3.2.2.20. to 3.2.2.83.
3.2.2. Building Size and Construction Relative to Occupancy
In Plain Language
A mezzanine that counts as a storey for building-height purposes must meet the same fire-separation requirements set out for floor assemblies generally in Articles 3.2.2.20 to .83.
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.