Chimney anatomy

01 · Chimney cap

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

• Cap can become damaged or blown off during storms.
• Clogging from leaves and debris.
• Rust if made from metal.

02 · Crown

The crown is the top surface of the chimney that helps protect it from weather damage.

• Cracking due to freeze-thaw cycles.
• Water leakage through cracks.
• Deterioration over time.

03 · Flashing

Flashing is the metal layer between the chimney and roof, preventing water leaks.

• Corrosion or rust.
• Separation from the chimney or roof.
• Improper installation leading to leaks.

04 · Brick and mortar

These are the materials that make up the body of the chimney, providing structure and support.

• Cracking from age or weather conditions.
• Spalling due to moisture penetration.
• Weakened mortar joints.

05 · Flue liner

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

• Cracks or holes compromising safety.
• Build-up of creosote or soot.
• Incorrect sizing affecting efficiency.

06 · Smoke chamber

Located just above the firebox, it helps funnel smoke up into the flue.

• Cracking from heat exposure.
• Soot and creosote build-up.
• Improper shaping causing smoke spillage.

07 · Damper

This adjustable plate sits above the firebox, controlling air flow and smoke release.

• Rust or corrosion causing it to stick.
• Improper sealing leading to heat loss.
• Warping affecting functionality.

08 · Firebox

The area where the fire is built, usually made of firebrick or refractory panels.

• Cracked bricks or panels.
• Heat damage reducing effectiveness.
• Ash and debris accumulation.