MarkhamBuilding InspectionsInspections
Gas Fireplace Vent Duct Air Barrier Penetration
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
- Gas Fireplace Vent Duct Penetration of the Air Barrier
- For
- builder
- Building types
- All building types
- Pages
- 2
Overview
Builder Tip Issue No. 27 from the City of Markham Building Standards Department, dated January 1, 2025, updated to the 2024 Ontario Building Code and listed among its housing tips, on the gas fireplace vent where it passes through the air and vapour barrier. It quotes Sentences (6) and (8) of Article 9.25.3.3. on sealing penetrations and the clearances around chimneys and gas vents with noncombustible material and high-temperature caulking. The Objective describes the projecting fireplace enclosure, gypsum board lining it, and insulating and sealing before the fireplace is set.
What it covers
- 9.25.3.3 Continuity of the Air Barrier System
- Objective
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