The Ontario Building Code | Clearance
9.37.3.2. Clearance
(1) At every opening in a wall made of logs in a horizontal position where shrinkage can occur there shall be a clearance between the rough buck header and the lintel log of not less than 13 mm in width for each 300 mm of height to allow for settlement.
Section 9.38. Park Model Trailers
9.38.1. Scope
In Plain Language
A minimum clearance must be maintained for log construction, as set out in this article, protecting the wood from ground moisture and other damage sources.
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.