Chimney anatomy

01 · Chimney cap

A chimney cap sits on top of your chimney, protecting it from rain, debris, and animals.

• Gets damaged or blown off by strong winds
• Rusts over time, leading to holes
• Clogs with debris, affecting airflow

02 · Crown

The crown covers the top of your chimney around the flue and helps prevent water damage.

• Cracks form due to weather exposure
• Water pooling leading to deterioration
• Improper installation causing leaks

03 · Flashing

Flashing seals the space between the chimney and roof, preventing water from entering.

• Leaks from worn or damaged seals
• Improper installation causing gaps
• Corrosion leading to holes

04 · Brick and mortar

These are the bricks and mortar that make up the structural body of the chimney.

• Crumbling mortar joints causing instability
• Brick spalling due to freeze-thaw cycles
• Efflorescence, a white residue from moisture

05 · Flue liner

The flue liner channels smoke and gases out of the chimney safely.

• Cracks from thermal stress
• Buildup of creosote leading to blockages
• Corrosion weakening the liner

06 · Smoke chamber

The smoke chamber is located above the firebox and funnels smoke from the fireplace to the flue.

• Cracks in the walls allowing smoke leakage
• Soot buildup decreasing efficiency
• Poor shape affecting draft

07 · Damper

The damper is a movable plate that opens or closes the flue, controlling airflow.

• Rust making it difficult to open or close
• Warping from heat exposure
• Stuck open or closed reducing efficiency

08 · Firebox

The firebox is where the fire burns and is constructed to withstand high heat.

• Cracked bricks due to high temperatures
• Mortar joints deteriorating
• Soot and creosote accumulation