In Plain Language

Interior finish materials used on the walls or ceiling of a portable classroom must have a flame-spread rating of 150 or less, limiting how quickly fire could spread across interior surfaces.

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.