In Plain Language

A moisture resistant backing is required behind tile in wet areas, as set out in this article, protecting the wall structure from water that penetrates tile grout lines 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.