In Plain Language

Where foamed plastic insulation is used inside a vertical service space (like a shaft), this clause requires it to be protected in the manner set out in Article 3.1.5.12, typically to limit fire and smoke contribution.

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.