Firestop Services Toronto

Professional Firestop Services in the GTA

Last updated: March 6, 2026

Konstruction Group provides professional firestop services as part of our complete insulation and drywall package for multiplexes and multi-unit residential buildings throughout Toronto. Whenever pipes, cables, or ducts penetrate fire-rated walls and floors, proper firestopping is required to maintain the fire resistance rating. We install tested firestop systems that meet Ontario Building Code requirements and pass fire marshal inspections.

Firestopping for Multiplexes

Duplexes, triplexes, and fourplexes require fire-rated separations between dwelling units. Every penetration through these fire barriers - plumbing pipes, electrical conduits, HVAC ducts, communication cables - must be properly firestopped to maintain the rated fire separation. We install firestop systems throughout multiplexes as part of our insulation and drywall scope.

Firestop Services

• Penetration Seals – Fire-rated sealants for pipes, cables, and conduits through fire-rated walls and floors
• Joint Systems – Fire-rated sealants for construction joints and gaps in fire barriers
• HVAC Penetrations – Firestop collars and wraps for ductwork through fire-rated assemblies
• Electrical Penetrations – Firestop putty and sealants for conduits and cable bundles
• Plumbing Penetrations – Firestop systems for water, drain, and vent pipes
• Documentation – Complete firestop installation records for inspections

Why Firestopping Matters

Fire-rated walls and floors only work when they're complete. Every unsealed penetration is a path for fire and smoke to spread between units - and smoke inhalation is the leading cause of fire-related deaths. A 1-hour fire-rated wall with unfirestopped penetrations may fail in minutes as flames travel through open gaps around pipes and cables. Proper firestopping maintains the rated protection for the full required duration, protecting occupants and meeting Ontario Building Code and Ontario Fire Code requirements.

Tested Firestop Systems

We use firestop products from major manufacturers with tested and listed systems for specific penetration types. Each penetration configuration - whether it's a 4-inch ABS drain pipe through a 1-hour wall or a bundle of data cables through a 2-hour floor - has an approved firestop method with a ULC system number. We match the right product and installation to each situation, whether that's intumescent sealant, mineral wool packing with caulk, or a fire-rated collar. This ensures firestopping will perform as required during a fire event and pass inspection.

Part of Our Complete Package

Firestopping is included in our scope for multiplex projects where we provide framing, insulation, and drywall. We coordinate firestop installation after mechanical and electrical rough-in and before drywall. This works alongside our fire-rated drywall assemblies to provide complete fire separation. This integrated approach ensures all penetrations are identified and properly sealed - nothing gets missed between trades.

What We Provide vs. What You Need

• We Provide – Firestop materials, installation, documentation for all penetrations in our scope
• You Provide – Completed mechanical/electrical rough-in, fire-rated assembly drawings showing required ratings

Why Choose Konstruction Group

• Multiplex Experience – Extensive experience with multi-unit firestopping requirements
• Tested Systems – We use listed products installed per tested methods
• Documentation – Complete records for fire marshal inspections
• $10M Liability Insurance – Full coverage for firestopping penetrations and service openings
• Integrated Service – Firestopping included with our framing and drywall
• Code Compliant – Installation meets OBC fire separation requirements

Firestop Caulking & Sealants

Firestop caulking is the most common method for sealing penetrations through fire-rated walls and floors. We apply intumescent and elastomeric firestop sealants around pipes, conduits, cables, and HVAC penetrations to maintain the fire rating of the assembly. Intumescent sealants expand when exposed to heat, sealing the gap left when combustible materials burn away. We use tested and listed products from manufacturers like Hilti, 3M, and STI to ensure every seal meets the specific ULC listing for your assembly type.

Firestop Foam & Pillows

For larger penetrations — cable trays, bus ducts, and grouped conduit runs — firestop pillows and foam provide a removable, re-enterable solution. Firestop pillows are packed into openings and expand under heat to maintain the fire rating. Firestop foam is sprayed into irregular gaps where caulking alone cannot fill the void. Both methods are tested to maintain fire ratings of 1 to 3 hours depending on the assembly and penetration size.