Chimney anatomy

01 · Chimney cap

A chimney cap is a protective covering at the top of your chimney that keeps rain, debris, and animals out.

• Can become rusted or damaged by weather
• May become clogged with leaves or debris
• Can be dislodged during strong winds

02 · Crown

The chimney crown is a concrete slab that covers and seals the top of the chimney to prevent water intrusion.

• Cracks due to weather exposure
• Deterioration from freeze-thaw cycles
• Poor construction or materials can lead to leaks

03 · Flashing

Flashing is a metal barrier that prevents water from seeping between the chimney and roof.

• Can rust or corrode over time
• Become loose or detached in high winds
• Improper installation can lead to leaks

04 · Brick and mortar

The masonry consists of the bricks and mortar that form the visible structure of the chimney.

• Mortar joints can crack or deteriorate
• Bricks may spall or chip due to moisture
• Shifting foundations can cause structural issues

05 · Flue liner

A flue liner helps contain combustion products and protects the chimney walls from heat and corrosion.

• Cracks or gaps can develop over time
• Can be damaged by chimney fires
• Improper sizing can affect draft

06 · Smoke chamber

The smoke chamber is the area above the firebox that funnels smoke into the flue.

• Creosote buildup restricts smoke flow
• Uneven walls can disrupt draft
• Cracks can lead to leaks

07 · Damper

A damper regulates airflow and prevents heat loss when the fireplace is not in use.

• May rust or seize shut
• Can be damaged by intense heat
• Improper sealing can lead to drafts

08 · Firebox

The firebox is the section of the fireplace where the fire burns.

• Bricks or panels can crack from heat
• Mortar joints may deteriorate
• Accumulation of soot or ash