The Ontario Building Code | Protection from Decay
9.23.2.2. Protection from Decay
(1) Ends of wood joists, beams and other members framing into masonry or concrete shall be treated to prevent decay where the bottom of the member is at or below ground level, or a 12 mm air space shall be provided at the end and sides of the member.
(2) Air spaces required in Sentence (1) shall not be blocked by insulationhttp://thehandyforce.com/insulation/" title ="Toronto home insulation">insulation, vapour barriers or air tight materials.
In Plain Language
Wood framing must be protected from decay as set out in this article, addressing moisture and other conditions that could rot structural wood 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.