MarkhamBuilding InspectionsInspections
Installations of Air Barriers at Windows and Doors
Published by City of Markham
This is the City of Markham’s document, as published on its website on 18 October 2026. The municipality may have changed it since: check the current version at the source. Legal notice
- Type
- Guide
- Published by
- City of Markham
- Date
- January 1, 2025
- Also called
- Installations of Air Barrier at Windows and Doors
- For
- builder
- Building types
- All building types
- Pages
- 2
Overview
Builder Tip Issue No. 6 from Markham's Building Standards Department, dated January 1, 2025 and updated to the 2024 Ontario Building Code, on sealing the air barrier where windows and doors pierce it. It quotes Sentences (6.1) and (6.2) of Article 9.25.3.3.: tape or spray foam for an interior air barrier, and flexible flashing, caulking or spray foam for an exterior one. Its Objective names the gap between the stud opening and the unit as the main leak and shows two common sealing details, one of the City's housing tips.
What it covers
- 9.25.3.3. Continuity of the Air Barrier Protection
- Objective
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