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,
(d) lighting="http://thehandyforce.com/electrical/" title ="East York Electrician">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.