Chimney anatomy

01 · Chimney cap

The chimney cap sits at the top of the chimney and prevents rain, debris, and animals from entering.

• Rust or corrosion can develop over time.
• It may become dislodged or damaged due to strong winds.
• The mesh can become clogged with debris, restricting airflow.

02 · Crown

The crown is a slab, typically made of concrete, that covers the top of the chimney to protect it from weather damage.

• Cracks can form, allowing water to seep in.
• Poor construction can lead to premature wear.
• It may become uneven or degrade over time.

03 · Flashing

Flashing is a weatherproofing material that seals the joint between the chimney and the roof.

• Leaks can occur if flashing is improperly installed.
• Corrosion can weaken the metal over time.
• High winds can lift flashing away from the chimney.

04 · Brick and mortar

Brick and mortar form the structural walls of the chimney, providing stability and protection.

• Mortar joints can crack or erode with age.
• Bricks may spall or flake due to moisture.
• The entire structure can become misaligned or unstable.

05 · Flue liner

The flue liner is a conduit inside the chimney that directs smoke and gases out of the home.

• Cracks can pose safety hazards by allowing gases to escape.
• Creosote buildup can restrict airflow and increase fire risk.
• Corrosion can occur in metal liners over time.

06 · Smoke chamber

The smoke chamber is located just above the firebox and funnels smoke from the fire to the flue.

• Crevices may develop, allowing smoke to escape into the home.
• Soot and creosote can accumulate and reduce efficiency.
• Improper construction can hinder smoke flow.

07 · Damper

The damper is a device that seals the chimney to prevent drafts when the fireplace is not in use.

• It can become stuck due to rust or debris.
• Improper sealing may lead to energy loss.
• It may not open or close fully if misaligned.

08 · Firebox

The firebox is the cavity where the fire burns, constructed to withstand high temperatures.

• Bricks may crack or degrade under constant heat.
• Mortar joints can become loose or damaged.
• Improper venting can lead to smoke buildup.