The Ontario Building Code | Scope and Application
9.25.1.1. Scope and application
(1) This Section applies to heat, air and water vapour transfer and measures to control condensation.
(2) All walls, ceilings and floors separating conditioned space from unconditioned space, the exterior air or the ground shall be,
(a) provided with,
(i) thermal insulationhttp://thehandyforce.com/insulation/" title ="Toronto home insulation">insulation conforming to Subsection 9.25.2.,
(ii) an air barrier system conforming to Subsection 9.25.3., and
(iii) a vapour barrier conforming to Subsection 9.25.4., and
(b) constructed in such a way that the properties and relative position of all materials conform to Subsection 9.25.5.
(3) insulationhttp://thehandyforce.com/insulation/" title ="Toronto home insulation">insulation and sealing of heating and ventilating ducts shall conform to Sections 9.32. and 9.33.
9.25.2. Thermal insulationhttp://thehandyforce.com/insulation/" title ="Toronto home insulation">insulation
In Plain Language
This article sets out the scope and application of the insulation and air leakage control requirements covered in this Section.
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.