Chimney anatomy

01 · Chimney cap

A chimney cap covers the top of the chimney to keep out rain, animals, and debris.

• Rusting or damage from weather exposure
• Animal nests can block it
• Debris accumulation

02 · Crown

The crown is a slab that sits on top of the chimney to protect it from weather damage.

• Cracking due to freeze-thaw cycles
• Water penetration leading to leaks
• Deterioration from age

03 · Flashing

Flashing is the metal around the chimney base that prevents water from leaking into the roof.

• Corrosion or rust of metal
• Loose fittings causing leaks
• Cracked caulking or sealants

04 · Brick and mortar

The brick and mortar form the outer structure of the chimney and provide structural support.

• Cracking or spalling of bricks
• Mortar deterioration or holes
• Water absorption leading to damage

05 · Flue liner

The flue liner channels smoke and gases out of the home and protects the chimney walls.

• Cracking or deterioration due to heat
• Creosote buildup causing blockages
• Improper installation leading to inefficiency

06 · Smoke chamber

The smoke chamber is located above the firebox and funnels smoke into the flue.

• Soot buildup reducing efficiency
• Uneven surfaces causing turbulence
• Cracks in the chamber walls

07 · Damper

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

• Rust or corrosion leading to malfunction
• Improper sealing causing drafts
• Warping from heat exposure

08 · Firebox

The firebox is where the fire burns and is usually lined with heat-resistant materials.

• Cracked bricks or lining from heat
• Soot and debris accumulation
• Deterioration over time from use