Chimney anatomy

01 · Chimney cap

The chimney cap sits on top of the chimney to prevent rain, debris, and animals from entering.

• Cap becomes loose or dislodged.
• Rust leads to deterioration.
• Mesh screen clogs with debris.

02 · Crown

The chimney crown is a slab that covers the top of the chimney, protecting it from weather damage.

• Cracks develop due to weather exposure.
• Water pooling causes erosion.
• Deterioration from freeze-thaw cycles.

03 · Flashing

Flashing seals the gap between the chimney and roof to keep water out.

• Flashing pulls away from chimney.
• Rusting leads to water leaks.
• Improper installation causes gaps.

04 · Brick and mortar

The masonry consists of bricks and mortar to form the main structure of the chimney.

• Bricks crack from weather exposure.
• Mortar joints erode over time.
• Water penetration causes crumbling.

05 · Flue liner

The flue liner protects the chimney walls from heat and corrosion while guiding smoke out.

• Linings crack under extreme heat.
• Creosote buildup restricts flow.
• Corrosion in metal liners.

06 · Smoke chamber

The smoke chamber funnels smoke from the firebox to the flue.

• Creosote buildup restricts airflow.
• Cracks allow smoke leakage.
• Uneven bricks reduce efficiency.

07 · Damper

The damper controls the flow of air and smoke through the chimney, sealing it when not in use.

• Damper gets stuck open or closed.
• Corrosion prevents proper sealing.
• Warping causes gaps.

08 · Firebox

The firebox is the area where the fire burns, constructed from heat-resistant materials.

• Bricks become damaged from heat.
• Mortar joints crack and crumble.
• Debris builds up over time.