The Ontario Building Code | Protection from Condensation
7.3.5.6. Protection from Condensation
(1) Piping used for internal leaders, which may be subject to condensation, shall be installed in a manner that limits the risk of damage to the building due to condensation.
In Plain Language
Piping carrying internal leaders (interior rainwater drainage), which can experience condensation from cold water inside on a warmer day, must be protected against moisture damage from that condensation.
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.