Service · Toronto & GTA
Chimney Liners
Custom-fabricated stainless steel liners for gas appliances, fireplaces, and wood stoves. Required under Ontario Building Code. using CSA-approved stainless steel parts.
An unlined chimney is not a safe chimney. In older Toronto homes, the flue is either unlined masonry or has clay tile that has cracked, offset, or deteriorated. Both are code violations for any connected appliance, and both are carbon monoxide risks.
Ontario Building Code requires a continuous, intact liner for any gas appliance or fireplace. Cracked clay tile doesn’t meet that standard, and neither does bare masonry. When an HVAC technician flags a failed liner during an annual inspection, or when a home inspector identifies the flue as non-code, a stainless steel liner is the correct repair, not a patch of the clay tile.
We fabricate liners to the exact dimensions of your flue. Flex liner or rigid liner sections are selected based on flue geometry. Every liner is installed with a proper termination cap, insulation wrap where required, and a full draw test before sign-off.
- Gas furnace, boiler, or water heater venting through an unlined or clay-tile flue
- Carbon monoxide detector triggering without another identifiable source
- HVAC technician or home inspector has flagged a cracked or non-compliant liner
- Visible soot or tar staining outside the firebox, indicating draft failure
- Smoke entering living spaces during or after fireplace use
- Converting a wood-burning fireplace to a gas insert
- Insurance renewal flagging chimney liner compliance
Measured to fit, tested before we leave. The liner is only as good as its installation.
Flue measurement
We measure the flue dimensions top to bottom, check for offsets, and determine whether flex or rigid liner sections are appropriate for your specific chase geometry.
Liner fabrication
Liners are custom-cut to length on-site or pre-fabricated to specification. We use Type 316L stainless for gas applications, the grade specified for condensing flues.
Installation
The liner is lowered from the top and connected at the base to the appliance collar. Insulation wrap is installed where required. The termination cap is fitted and sealed at the crown.
Draw test
We run the connected appliance and verify draw before leaving. You receive a written installation record and warranty certificate for your insurance file.
Approved parts
Stainless steel, made in Canada
Ontario Building Code
Fully compliant installation
Carbon monoxide safe
Full draw test on completion
We install Type 316L stainless steel, the grade required for gas appliance flues operating at condensing temperatures. For high-temperature wood applications, we use 304 or 316L depending on the appliance specifications. We do not install aluminium liners.
For most residential installations, single-flue, standard height, the installation is completed in one day. Complicated situations (such as the 3-story church building documented in our case studies) required the same single-day timeline with a larger crew. Multi-flue or high-rise work is quoted separately.
Yes. Ontario Building Code requires a continuous liner when any gas appliance is connected to a masonry chimney, sized to the appliance BTU output. An insert installed without a liner is a code violation regardless of what the installer told you.
If the clay tile liner is cracked, offset, or has missing sections, it does not meet code and should be replaced. A cracked liner allows combustion gases, including carbon monoxide, to enter the living space through the masonry. We can inspect and provide a written assessment if you want a second opinion.
In most cases, yes. The liner is accessed from the roof and the firebox or cleanout at the base. Roofline access requires a fall-protection setup regardless of method. We include this in all liner installations.
CSA-approved liner installation. Done right, once.
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