The Ontario Building Code | Suspended Membrane Ceiling
9.10.3.4. Suspended Membrane ceiling
(1) Where a ceiling construction has a suspended membrane ceiling with lay-in panels or tiles that contribute to the required fire-resistance rating, hold down clips or other means shall be provided to prevent the lifting of such panels or tiles in the event of a fire.
9.10.4. building Size Determination
In Plain Language
Where a suspended membrane ceiling contributes to a fire-resistance rating, it must meet the requirements set out in this article, since a dropped ceiling can be part of what protects the floor assembly above.
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.