The Ontario Building Code | Building Services in an Assembly
9.11.2.2. building Services in an Assembly
(1) Building services located in an assembly required to have a sound transmission class rating shall be installed in a manner that will not decrease the required rating of the assembly.
Section 9.12. Excavation
9.12.1. General
In Plain Language
Building services, such as plumbing and ductwork, that pass through or serve an assembly with a required sound rating must be installed as set out in this article, so they don't create a sound leak through an otherwise well-rated wall or floor.
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.