The Ontario Building Code | Plumbing Fixtures and Bathrooms Finishes
3.1.13.3. Plumbing Fixtures and Bathrooms Finishes
(1) The flame-spread rating of interior wall and ceiling finishes for a bathroom in a suite of residential occupancy shall be not more than 200.
(2) Plumbing fixtures shall have a flame-spread rating not more than 200.
In Plain Language
Bathroom interior finishes in residential suites are allowed a flame-spread rating up to 200, and plumbing fixtures themselves are capped at the same 200 rating.
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.