Chimney anatomy

01 · Chimney cap

The chimney cap sits at the top of the chimney and covers the opening to prevent rain, debris, and animals from entering.

• Can become damaged or loose due to weather
• May rust or corrode over time
• Might not fit properly, allowing water or pests in

02 · Crown

The crown is the concrete or mortar top surface of the chimney that directs water away from the flue and onto the roof.

• Cracks can form, allowing water to seep in
• Can deteriorate over time due to weather exposure
• Poor construction might lead to water damage

03 · Flashing

Flashing is the metal barrier at the joint between the chimney and the roof that prevents water leaks.

• May rust or corrode over time
• Can become loose or separated, causing leaks
• Improper installation leading to gaps

04 · Brick and mortar

Brick and mortar make up the chimney structure, providing stability and protection.

• Cracks can form, causing structural issues
• Mortar can erode, leading to loose bricks
• Water damage leading to deterioration

05 · Flue liner

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

• Cracks or holes can develop, posing safety risks
• Deterioration due to heat and chemical exposure
• Improper sizing or installation reducing efficiency

06 · Smoke chamber

The smoke chamber is the area above the fireplace and below the flue that helps direct smoke upwards.

• Uneven surfaces can cause turbulence and smoke back-up
• Cracks can form, allowing smoke to leak
• Improper construction affecting airflow

07 · Damper

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

• Rust or corrosion can prevent proper sealing
• Can become stuck or difficult to operate
• Poor fit allowing drafts or heat loss

08 · Firebox

The firebox is the part of the fireplace where the fire is built, made to withstand high temperatures.

• Bricks can crack due to heat stress
• Mortar joints may weaken over time
• Improper maintenance leading to damage