PART 7 — PLUMBINGUpdated for the 2024 Ontario Building Code
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7.2.6.7.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 is permitted to 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.
(See Note A-7.2.6.7.(3))
(4) Galvanized steel pipe and fittings shall conform to ASTM A53 / A53M, “Standard Specification for 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 NPS 4 and smaller shall be Schedule 40 or heavier and fittings of less than NPS 2 shall be
galvanized screw fittings.
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Code text is reproduced for reference from the Ontario Building Code (O. Reg. 163/24, 2024 Building Code Compendium). This page is provided for general information and is not an official copy. Always verify requirements against the official Ontario Building Code and confirm with your local building department.