Chimney anatomy

01 · Chimney cap

A chimney cap sits at the top of the chimney and prevents debris, animals, and water from entering.

• Corrosion or rust due to weather exposure
• Becoming dislodged or damaged during storms
• Blockage caused by debris accumulation

02 · Crown

The chimney crown is the top surface that seals the chimney from the outside elements.

• Cracking from weather changes
• Water pooling leading to deterioration
• Separation from the chimney structure

03 · Flashing

Flashing is a metal barrier that seals the joint between the chimney and the roof to prevent leaks.

• Loosening or lifting due to wind
• Corrosion leading to leaks
• Improper installation causing gaps

04 · Brick and mortar

These are the structural components of the chimney, providing its shape and strength.

• Mortar joints eroding over time
• Bricks cracking from freeze-thaw cycles
• Spalling when moisture causes the surface to peel

05 · Flue liner

The flue liner protects the chimney walls from heat and helps channel smoke and gases out of the home.

• Cracking from thermal stress
• Blockages from creosote buildup
• Corrosion in metal liners

06 · Smoke chamber

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

• Inadequate parging causing turbulence
• Creosote buildup increasing fire risk
• Cracks allowing smoke leakage

07 · Damper

The damper regulates airflow and can seal off the chimney when not in use.

• Rust causing it to stick open or closed
• Misalignment preventing full closure
• Cable or lever mechanisms breaking

08 · Firebox

The firebox is where the fire burns, contained within the fireplace.

• Bricks cracking from intense heat
• Mortar joints weakening or missing
• Accumulation of soot and debris