Steel Pipe

(1)  Except as provided in Sentences (2) and (3), welded and seamless steel pipe shall not be used in a plumbing system.

(2)  Galvanized steel pipe may be used in a drainage system or a venting system above ground inside a building.

(3)  Galvanized steel pipe and fittings shall not be used in a water distribution system except,

    (a)   in buildings of industrial occupancy, or

    (b)   for the repair of existing galvanized steel piping systems.

(4)  Galvanized steel pipe and fittings shall conform to ASTM A53/A53M, “Pipe, Steel, Black and Hot Dipped, Zinc-Coated Welded and Seamless”.

(5)  Where galvanized steel pipe is used in a drainage system, it shall be used with drainage fittings.

(6)  All steel pipe of 4 in. size and smaller shall be schedule 40 or heavier and fittings of less than 2 in. size shall be galvanized screw fittings.

Article Ontario Regulation 332/12 Building Code,   O. Reg. 332/12: BUILDING CODE ( © Queen’s Printer for Ontario, 2021.