The Ontario Building Code | Combustible Piping
220.127.116.11. 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 18.104.22.168A. or 22.214.171.124A. 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