MarkhamBuilding InspectionsInspections

Air Barrier & Recessed Light Fixtures

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
For: builder
Building types: All building types
Pages: 2
Instruments: CAN/CGSB-51.34-M

Overview

Builder Tip Issue No. 9 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 pot lights that pierce the attic air and vapour barrier. It quotes Article 9.25.3.2. on air barrier properties, including polyethylene to CAN/CGSB-51.34-M, and Sentence 9.25.3.3.(6) on sealing penetrations. The Objective warns of attic condensation from leaks and gives three steps for a rigid polyethylene surround, with a note on its melting point and an illustration.

What it covers

9.25.3.2. Air Barrier System Properties
9.25.3.3. Continuity of the Air Barrier System
Objective

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