The Ontario Building Code | Bonding or Tying of Other than Masonry Veneer
9.20.9.2. Bonding or Tying of Other than masonry Veneer
(1) Except as provided in Article 9.20.9.5 for masonry veneer, masonry walls that consist of two or more wythes shall have the wythes bonded or tied together with masonry bonding units as described in Article 9.20.9.3. or with metal ties as described in Articles 9.20.9.4.
In Plain Language
For multi-wythe masonry walls (other than masonry veneer, which has its own article), this clause requires the wythes to be physically bonded together, either with masonry bonding units or with metal ties, rather than just stacked side by side.
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.