Chimney anatomy

01 · Chimney cap

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

• Rust can cause it to deteriorate.
• Improper fit may lead to water leaks.
• Strong winds can damage or blow it off.

02 · Crown

The crown is a concrete slab on top of the chimney that seals it from weather and elements.

• Cracking can occur due to weather exposure.
• Improper construction can lead to water leakage.
• Erosion may happen from freeze-thaw cycles.

03 · Flashing

Flashing is used to seal the space between the chimney and roof to prevent water leaks.

• Improper installation may cause leaks.
• Corrosion can damage metal flashing.
• Debris accumulation can cause water to pool.

04 · Brick and mortar

The brick and mortar form the main structure of the chimney, providing stability and strength.

• Mortar deterioration can lead to loose bricks.
• Cracks may develop due to settling or weather.
• Water damage can erode the masonry over time.

05 · Flue liner

A flue liner protects the chimney walls from heat and corrosion while guiding smoke outside.

• Cracks can form from excessive heat.
• Creosote buildup may occur if it's not cleaned.
• Improper installation can lead to inefficiencies.

06 · Smoke chamber

The smoke chamber funnels smoke from the firebox to the flue for efficient exit.

• Soot buildup can reduce efficiency.
• Cracks may allow smoke leakage.
• Improper shape can impact draft.

07 · Damper

A damper controls the draft and seals the chimney when not in use to prevent heat loss.

• Rust can prevent it from opening or closing.
• Debris can obstruct proper sealing.
• Warped metal can lead to inefficiency.

08 · Firebox

The firebox is where the fire burns, containing the fire's heat and directing it up the chimney.

• Cracks in the bricks can cause safety issues.
• Excessive soot can reduce efficiency.
• Heat damage may compromise integrity.