Chimney anatomy

01 · Chimney cap

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

• Rust or corrosion from weather exposure
• Clogging from debris or bird nests
• Detached or blown off by strong winds

02 · Crown

The crown covers and seals the top of the chimney to protect it from water damage.

• Cracking due to weather conditions
• Water penetration leading to leaks
• Deterioration from age or poor installation

03 · Flashing

Flashings are metal strips that create a waterproof seal between the chimney and roof.

• Caulking failure leading to leaks
• Corrosion or rust over time
• Improper installation causing gaps

04 · Brick and mortar

The brick and mortar make up the main structure of the chimney, providing stability and insulation.

• Cracked or spalling bricks from moisture
• Weakening mortar joints
• Efflorescence due to mineral deposits

05 · Flue liner

The flue liner protects the chimney walls from heat and corrosive byproducts of combustion.

• Cracks or gaps allowing heat escape
• Creosote buildup increasing fire risk
• Wearing down from acidic content

06 · Smoke chamber

The smoke chamber compresses the smoke and gases from the fire into the flue.

• Uneven parging leading to turbulence
• Soot accumulation affecting flow efficiency
• Structural cracks impacting performance

07 · Damper

A damper regulates airflow and prevents drafts when the fireplace is not in use.

• Rust making it hard to open or close
• Warping from heat exposure
• Air leaks due to sealing issues

08 · Firebox

The firebox is where the fire actually burns, constructed to withstand high temperatures.

• Cracked bricks from thermal stress
• Failure of refractory walls
• Ash and soot buildup reducing space