The Ontario Building Code | Bond Break
9.16.4.4. Bond Break
(1) A bond-breaking material shall be placed between the slab and footings or rock.
In Plain Language
A bond break, a layer preventing the slab from bonding to an adjacent structural element, is required under the conditions set out in this article, letting the two elements move independently.
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.