The Ontario Building Code | Exposure to Exterior Space or the Ground and Separation of Dissimilar Environments
5.1.2.1. Exposure to exterior Space or the Ground and Separation of Dissimilar Environments
(1) This Part applies to,
(a) buildingmaterials, components and assemblies exposed to exterior space or the ground, including those separating interior space from exterior space or separating interior space from the ground,
(b) buildingmaterials, components and assemblies separating environmentally dissimilar interior spaces, and
(c) site materials, components, assemblies and grading that may affect environmental loads on building materials, components and assemblies exposed to exterior space or the ground.
5.1.3. Definitions
In Plain Language
Building components and assemblies separating dissimilar environments (like interior conditioned space from unconditioned exterior space) must be designed to handle the exposure conditions that separation creates.
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.