The Ontario Building Code | Requirement for Wood Preservative
9.37.1.2. Requirement for wood Preservative
(1) The portion of any log coming in contact with masonry or concrete at or below grade shall be treated with a wood preservative to prevent decay.
In Plain Language
Wood preservative is required for log construction under the conditions set out in this article, protecting this exposed, solid-wood building method from decay.
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.