B-1.1, r. 2 - Construction Code

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8.28. A contractor or owner-builder may install double-walled piping only if the piping meets the requirements of
(1)  section 8.25, if it is steel; or
(2)  section 8.27, if it is nonmetallic.
Such piping must be installed inside other piping that meets the requirements of section 8.25 or 8.27, as the case may be.
It must also have an automatic leak detection system with a visual and audible alarm that meets the requirements of ULC/ORD Standard C107.12, Line Leak Detection Devices for Flammable Liquid Piping, or CAN/ ULC-S675.2, Standard for Nonvolumetric Precision Leak Detection Devices for Underground and Aboveground Storage Tanks and Piping for Flammable and Combustible Liquids, published by the Underwriters’ Laboratories of Canada.
O.C. 220-2007, s. 1; 87-2018O.C. 87-2018, s. 22.
8.28. A contractor or owner-builder may install double-walled piping only if it meets the requirements of
(1)  section 8.25, if it is steel;
(2)  section 8.26, if it is copper; or
(3)  section 8.27, if it is nonmetallic.
Such piping must be installed inside other piping that meets the requirements of section 8.25, 8.26 or 8.27, as the case may be.
It must also have an automatic leak detection system with a visual and audible alarm that meets the requirements of ULC/ORD Standard C107.12 Line Leak Detection Devices for Flammable Liquid Piping or ULC/ORD Standard C58.14 Non-Volumetric Leak Detection Devices for Underground Flammable Liquid Storage Tanks, published by Underwriters’ Laboratories of Canada.
O.C. 220-2007, s. 1.