Chimney anatomy

01 · Chimney cap

The chimney cap sits on top of the chimney and protects it from rain, debris, and animals.

• Can become damaged by weather
• May rust over time
• Can be dislodged by strong winds

02 · Crown

The crown is a concrete or stone slab on top of the chimney that seals and protects the bricks from water damage.

• Can crack due to temperature changes
• May erode over time
• Can lead to leaks if not sealed properly

03 · Flashing

Flashing is the metal seal at the base of the chimney where it meets the roof, designed to prevent leaks.

• May become loose or corroded
• Can cause leaks if not installed correctly
• Might pull away from the chimney due to shifting

04 · Brick and mortar

Bricks and mortar make up the main structure of the chimney, providing support and a pathway for smoke.

• Bricks can crack or spall
• Mortar joints can erode
• Water damage can lead to structural issues

05 · Flue liner

The flue liner is a lining inside the chimney that carries smoke and gases out of the home safely.

• Can crack or deteriorate
• May become clogged with creosote
• Liner may be missing or outdated

06 · Smoke chamber

The smoke chamber is located above the firebox and funnels smoke into the flue.

• May have crumbling mortar
• Can contain creosote buildup
• Improper shape can impede smoke flow

07 · Damper

The damper is a movable plate that opens and closes the flue to control airflow and prevent heat loss.

• Can get stuck in position
• Might warp or rust
• Sealing issues can lead to drafts

08 · Firebox

The firebox is the chamber where the fire is built, typically constructed with firebricks.

• Bricks can crack or deteriorate
• Mortar joints may fail
• Can suffer from high heat damage