MarkhamBuilding InspectionsInspections

Permitted Openings In Wall Fire Separations

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: Permitted Openings in Wall Fire Separation
For: builder
Building types: All building types
Pages: 4
Instruments: CAN/ULC-S115, Standard Method of Fire Tests of Firestop Systems · MMAH Supplementary Standard SB-3, Fire and Sound Resistance Tables · MMAH Supplementary Standard SB-2, Fire Performance Ratings

Overview

Markham's four-page Builder Tip No. 81, dated January 1, 2025 and updated to the 2024 OBC, one of the City's housing tips under the 2024 Ontario Building Code and a longer companion to its tip on openings in wall and ceiling assemblies. It quotes Article 9.10.5.1. and Subsection 9.10.9. on continuous barriers and penetrations sealed by firestops tested to CAN/ULC-S115, then lists the exceptions for combustible wiring, 4-gang outlet boxes and 30 mm water pipes. Its objective describes putty pads between outlet boxes and their acoustic rating.

What it covers

9.10.5.1. Permitted Openings in Wall Membranes
9.10.9. Fire Separations and Smoke-tight Barriers between Rooms and Spaces Within Buildings
9.10.9.1. Application
9.10.9.2. Continuous Barrier
9.10.9.6. General Requirements for Penetrations of Fire Separations
Objective

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