Chimney anatomy

01 · Chimney cap

A chimney cap sits on top of the chimney and prevents rain, debris, and animals from entering.

• Rust or damage from weather exposure
• Animals nesting if cap is missing
• Blockages from debris or leaves

02 · Crown

The chimney crown is the top surface of the chimney, designed to protect it from weather.

• Cracking due to weather exposure
• Water pooling causing further damage
• Deterioration over time

03 · Flashing

Flashing is a waterproofing material that seals the joint between the chimney and roof.

• Leaks from poor installation
• Corrosion or rusting
• Separation from the roof

04 · Brick and mortar

These materials form the main structure of the chimney, giving it shape and stability.

• Cracking or spalling of bricks
• Mortar joints eroding over time
• Shifting due to foundation issues

05 · Flue liner

The flue liner protects the chimney walls from heat and corrosion, and guides smoke out.

• Cracks from heat or creosote buildup
• Not fitting properly, allowing smoke leakage
• Erosion from acidic flue gases

06 · Smoke chamber

Located above the firebox, the smoke chamber helps guide smoke from the fire up into the flue.

• Improper construction or design
• Creosote buildup leading to blockages
• Cracks allowing smoke to escape

07 · Damper

The damper is a movable plate inside the flue that controls airflow and prevents heat loss.

• Difficulty in opening or closing
• Rust or warping over time
• Misalignment leading to air leaks

08 · Firebox

The firebox is where the fire burns and is built to endure high temperatures.

• Cracking from repeated heating and cooling
• Spalling of the firebrick
• Damage to mortar joints