Chimney anatomy

01 · Chimney cap

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

• Cap can become damaged or blown off in strong winds.
• Buildup of creosote can block vents.
• Rust or corrosion can occur over time.

02 · Crown

The chimney crown is the top surface of the chimney, designed to keep water from entering the masonry chimney structure.

• Cracking can occur due to weather exposure.
• Improper slope can lead to water pooling.
• Deterioration from environmental factors.

03 · Flashing

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

• Flashing can rust or become loose.
• Improper installation can lead to leaks.
• Sealant can deteriorate over time.

04 · Brick and mortar

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

• Mortar joints can crack or erode.
• Bricks can become loose or spall.
• Water damage can lead to structural issues.

05 · Flue liner

The flue liner protects the chimney walls from heat and corrosion and ensures safe exhaust of smoke and gases.

• Liner can crack or become damaged.
• Improper installation can reduce efficiency.
• Buildup of creosote can lead to blockages.

06 · Smoke chamber

The smoke chamber funnels smoke from the firebox into the flue, aiding in efficient venting.

• Buildup of soot can restrict airflow.
• Cracks can develop over time.
• Improper design can affect draft.

07 · Damper

The damper is a movable plate that regulates airflow and controls smoke and heat venting when the fireplace is in use.

• Damper can become stuck due to rust.
• Improper sealing allows drafts.
• Mechanical parts can wear out.

08 · Firebox

The firebox is the area inside the fireplace where the fire burns, built to withstand high temperatures.

• Cracks in brick or mortar can occur.
• Thermal stress can damage materials.
• Improper construction can reduce safety.