The Ontario Building Code | Combustible Piping
3.1.4.9. Combustible Piping
(1) Except as provided by Sentence (2), combustible piping and tubing and associated adhesives used in a building within the scope of Article 3.2.2.43A. or 3.2.2.50A. shall have a flame-spread rating not more than 25.
(2) Sentence (1) does not apply to,
(a) combustiblesprinkler piping and associated adhesives,
(b) combustibletubing for pneumatic controls and associated adhesives, provided the tubing has an outside diameter not more than 10 mm,
(c) combustiblepiping and tubing and associated adhesives used in public pools and public spas, and
(d) combustiblepiping and tubing and associated adhesives concealed in a concrete floor slab.
3.1.5. Noncombustible Construction
In Plain Language
For buildings within the scope of Articles 3.2.2.43A or 3.2.2.50A, combustible piping, tubing, and their adhesives are capped at a flame-spread rating of 25, though this clause exempts combustible sprinkler piping, small-diameter pneumatic control tubing, piping in public pools/spas, and piping embedded in concrete floor slabs.
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.