The Ontario Building Code | Interior Finish Description
3.1.13.1. Interior Finish Description
(1) Interior finish material shall include any material that forms part of the interior surface of a floor, wall, partitionor ceiling, including,
(a) interior cladding of plaster, wood or tile,
(b) surfacing of fabric, paint, plastic, veneer or wallpaper,
(c) doors, windows and trim,
(d) lighting elements, such as light diffusers and lenses forming part of the finished surface of the ceiling, and
(e) carpet material that overlies a floor that is not intended as the finished floor.
In Plain Language
This article defines what counts as 'interior finish' for the flame-spread rules that follow: interior cladding (plaster, wood, tile), surface coverings (fabric, paint, plastic, veneer, wallpaper), doors/windows/trim, light diffusers and lenses forming part of a finished ceiling, and carpet material overlying a non-finished subfloor.
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.