Chimney anatomy

01 · Chimney cap

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

• Can become dislodged or damaged by wind or storms.
• May rust or corrode over time.
• Clogs with debris, blocking airflow.

02 · Crown

The crown is a slab that covers the top of the chimney to protect it from weather elements.

• Cracks can develop, allowing water to seep in.
• Erosion of the surface due to weather exposure.
• Improper slope can lead to pooling water.

03 · Flashing

Flashing is a seal installed around the base of the chimney to prevent water leaks.

• Can corrode or rust over time.
• May pull away from surfaces, causing leaks.
• Improper installation leads to water seepage.

04 · Brick and mortar

These materials make up the structure of the chimney and provide support.

• Bricks can crack or spall from freeze-thaw cycles.
• Mortar joints may erode over time.
• Water damage can weaken the masonry structure.

05 · Flue liner

The flue liner protects the chimney walls from heat and corrosive byproducts.

• Cracks can form due to heat stress.
• Corrosion from acidic deposits.
• Improper installation can cause inefficiency.

06 · Smoke chamber

The smoke chamber funnels smoke from the firebox into the flue.

• Creosote build-up can restrict airflow.
• Improperly constructed chambers cause smoke problems.
• Cracks can form, leading to smoke leakage.

07 · Damper

A damper controls the airflow and draft in the chimney.

• Can become rusted or stuck.
• May not seal properly, leading to heat loss.
• Handle or mechanism might break.

08 · Firebox

The firebox is where the fire burns and provides a safe area to contain flames.

• Bricks can crack due to intense heat.
• Mortar joints may deteriorate over time.
• Water damage can weaken the structure.