The Ontario Building Code | Combustible Millwork
3.1.5.7. Combustible Millwork
(1) Combustible millwork, including interior trim, doors and door frames, show windows together with their frames, aprons and backing, handrails, shelves, cabinets and counters, is permitted in a building required to be of noncombustible construction.
In Plain Language
Combustible millwork, interior trim, doors and frames, display windows, handrails, shelving, cabinets, and counters are all permitted in buildings required to be of noncombustible construction; millwork is treated differently from structural or separating elements.
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.