Browse OBC — Part 5 — Environmental Separation
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Content on this site is based on the Ontario Building Code, Ontario Regulation 5/25, as published on e-Laws and last updated January 16, 2025. This site includes excerpts from Division B — Parts 1, 3–12 only. Division A, Division C, and the Appendices are not included.
Articles
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- 5.1.1.1 — Scope
- 5.1.2.1 — Exposure to Exterior Space or the Ground and Separation of Dissimilar Environments
- 5.1.3.1 — Reserved
- 5.1.4.1 — Structural and Environmental Loads
- 5.1.4.2 — Resistance to Deterioration
- 5.1.5.1 — Requirements in other Parts of the Code
- 5.2.1.1 — Exterior Environmental Loads
- 5.2.1.2 — Interior Environmental Loads
- 5.2.1.3 — Environmental Load and Transfer Calculations
- 5.2.2.1 — Determination of Structural Loads and Effects
- 5.2.2.2 — Determination of Wind Load
- 5.2.2.3 — Design Procedures
- 5.3.1.1 — Required Resistance to Heat Transfer
- 5.3.1.2 — Properties to Resist Heat Transfer or Dissipate Heat
- 5.3.1.3 — Location and Installation of Materials Providing Thermal Resistance
- 5.4.1.1 — Required Resistance to Air Leakage
- 5.4.1.2 — Air Barrier System Properties
- 5.5.1.1 — Required Resistance to Vapour Diffusion
- 5.5.1.2 — Vapour Barrier Properties and Installation
- 5.6.1.1 — Required Protection from Precipitation
- 5.6.1.2 — Installation of Protective Materials
- 5.6.2.1 — Sealing and Drainage
- 5.6.2.2 — Accumulation and Disposal
- 5.6.2.3 — Solar Collector Systems
- 5.7.1.1 — Application
- 5.7.1.2 — Required Protection
- 5.7.2.1 — Application
- 5.7.2.2 — Design of Building Elements under Hydrostatic Loads
- 5.7.2.3 — Required Protection
- 5.7.3.1 — Application
- 5.7.3.2 — Required Protection
- 5.7.3.3 — Waterproofing
- 5.7.3.4 — Where Dampproofing is Permitted
- 5.8.1.1 — Required Protection
- 5.8.1.2 — Determination of Sound Transmission Ratings
- 5.8.1.3 — Compliance with Required Ratings
- 5.8.1.4 — Detailed Method for Calculating ASTC
- 5.8.1.5 — Simplified Method for Calculating ASTC
- 5.10.1.1 — Compliance with Applicable Standards
- 5.10.2.1 — General
- 5.10.2.2 — Applicable Standards
- 5.10.2.3 — Structural Loads, Air Leakage and Water Penetration
- 5.10.2.4 — Heat Transfer
- 5.10.3.1 — Applicable Standards
- 5.10.4.1 — Definition
- 5.10.4.2 — Structural and Environmental Loads
- 5.10.4.3 — Heat Transfer
- 5.10.4.4 — Air Leakage
- 5.10.4.5 — Water Penetration