The Ontario Building Code | Support of Joists or Beams
9.21.5.3. support of joists or Beams
(1) joists or beams may be supported on masonry walls that enclose chimney flues provided the combustible members are separated from the flue by a minimum of 290 mm of solid masonry.
Section 9.22. fireplaces
9.22.1. General
In Plain Language
Joists or beams near a chimney must be supported as set out in this article, addressing the structural framing needed around this penetration through the floor or roof.
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.