In Plain Language

Piping that could be exposed to freezing temperatures must be protected against frost, since ice forming inside a pipe can crack it or block flow entirely.

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.