Chimney anatomy

01 · Chimney cap

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

• Can become rusted or damaged over time.
• May get dislodged during strong winds.
• Can be clogged with debris or bird nests.

02 · Crown

The crown is the top surface of the chimney that seals the edge between the flue and the chimney.

• Cracking due to temperature changes.
• Erosion from water exposure.
• Poor construction leading to water leaks.

03 · Flashing

Flashing is a waterproof seal that prevents water from leaking between the roof and the chimney.

• Can corrode or rust over time.
• Improper installation leading to leaks.
• Damage from shifting roofs or weather conditions.

04 · Brick and mortar

The brick and mortar make up the chimney's structure and provide stability.

• Mortar joints deteriorate due to weathering.
• Bricks can crack from freeze-thaw cycles.
• Leaking can result from gaps in the masonry.

05 · Flue liner

The flue liner channels smoke and gases safely out of the home.

• Cracks can form from repeated heating and cooling.
• Build-up of creosote increasing fire risk.
• Improper sizing can affect draft and efficiency.

06 · Smoke chamber

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

• Uneven surfaces can cause creosote build-up.
• Cracks can lead to smoke leakage.
• Poor design can affect draft efficiency.

07 · Damper

The damper controls airflow and prevents heat loss when the fireplace is not in use.

• Can become rusted or stuck.
• Improper sealing leading to drafts.
• Broken parts can prevent it from closing properly.

08 · Firebox

The firebox is where the fire burns, providing a safe area to contain the flames.

• Cracks can form in the bricks or refractory panels.
• Soot and creosote build-up over time.
• Wear and tear from repeated heating cycles.