In Plain Language

Combustible glazing is prohibited in the walls, ceilings, or closures of an exit stair enclosure, since a fire-rated escape route shouldn't include materials that could ignite and undermine its protection.

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.