Chimney anatomy

01 · Chimney cap

Sits on top of the chimney to prevent debris, rain, and animals from entering.

• Rust or corrosion
• Detached or loose cap
• Clogged with debris

02 · Crown

The cement layer on top of the chimney that keeps water from seeping in.

• Cracks in the concrete
• Water pooling
• Erosion of material

03 · Flashing

Metal sheeting that seals the joint between the chimney and roof.

• Leaks at the seams
• Corrosion or rust
• Loose or missing flashing

04 · Brick and mortar

The brickwork and mortar that make up the chimney's exterior structure.

• Cracked bricks
• Mortar deterioration
• Spalling (flaking bricks)

05 · Flue liner

The inner lining of the chimney, which protects the masonry and ensures safe venting.

• Cracked or damaged liner
• Creosote buildup
• Improper sizing

06 · Smoke chamber

Located just above the firebox, it funnels smoke into the flue.

• Creosote buildup
• Cracked or uneven surfaces
• Improper shape affecting draft

07 · Damper

A movable plate that seals the chimney when not in use to prevent heat loss.

• Rust or corrosion
• Stuck or hard to operate
• Air leaks when closed

08 · Firebox

The area where the fire is built, lined with firebricks.

• Cracked bricks
• Deteriorating mortar joints
• Soot buildup