The Ontario Building Code | Insulation of Support
7.3.4.3. insulationhttp://thehandyforce.com/insulation/" title ="Toronto home insulation">insulation of Support
(1) Where a hanger or support for copper tube or brass or copper pipe is of a material other than brass or copper, it shall be suitably separated and electrically insulated from the pipe to prevent galvanic action.
In Plain Language
Where a hanger or support touches copper piping, it must be insulated from direct metal-to-metal contact, since dissimilar metals in contact can corrode the pipe over time.
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.