What happens to my existing brick fireplace when I install an insert in Calgary?

When you install a gas or wood insert into your existing brick fireplace in Calgary, the brick structure remains completely intact — the insert simply slides into the existing firebox opening and transforms your inefficient masonry fireplace into a high-efficiency heating appliance.

Your existing brick fireplace and chimney become the housing system for the new insert. The brick firebox walls, hearth, and chimney structure all stay in place. A gas insert typically achieves 70-85% efficiency compared to your current masonry fireplace's 10-15% efficiency, meaning you'll get dramatically more heat output while using less fuel. For Calgary's long heating season from October through April, this efficiency improvement translates to substantial energy savings on your ATCO Gas bill.

The installation process involves several key modifications to integrate the insert safely. For a gas insert, a flexible aluminum or stainless steel liner gets installed down your existing chimney to properly vent the new appliance — your old clay tile liner likely has gaps or cracks after years of Calgary's freeze-thaw cycles and chinook temperature swings. The gas fitter runs a new gas line to the fireplace location and connects it to the insert's gas valve. The insert slides into your firebox opening and gets secured in place, with the front face covering the gap between the insert and your brick opening.

Your chimney requires inspection and likely some repair work before insert installation. Calgary's extreme temperature cycling — from -30°C winter cold snaps to +15°C chinook events within hours — accelerates mortar joint deterioration and crown cracking in masonry chimneys. Most Calgary chimneys over 15-20 years old need tuckpointing, crown repair, or cap replacement. A cracked or deteriorated chimney liner is dangerous with any fuel-burning appliance, so expect to invest $1,500-$3,000 in chimney restoration alongside your $2,500-$5,500 insert installation.

The aesthetic impact depends on your insert choice and finishing preferences. The insert face will cover most of your existing brick firebox opening, but your brick surround, hearth, and mantel remain visible and functional. Many Calgary homeowners use this opportunity to update their fireplace's appearance — adding a new wood mantel, stone veneer over the existing brick, or a decorative surround that complements the insert's style. You can also leave everything as-is for a more traditional look.

Installation requires a gas permit from the City of Calgary and Safety Codes Officer inspection — the same permitting process as any gas appliance installation. The gas fitter handles the permit application, gas line work, and coordinates the inspection. Never attempt DIY gas line work or skip the permit process, as unpermitted gas work creates safety hazards and insurance liability.

Need help finding a qualified gas fitter for your insert installation? Calgary Fireplaces can match you with local professionals who handle both the gas work and chimney preparation for a complete, code-compliant installation.