Chimney anatomy

01 · Chimney cap

A chimney cap sits at the top of your chimney and helps keep rain, debris, and animals out.

• Damage from weather exposure
• Clogs from debris
• Missing or improperly installed caps

02 · Crown

The crown is a concrete or metal top layer that seals the chimney from the weather.

• Cracks that allow water penetration
• Improper construction leading to deterioration
• Erosion from freeze-thaw cycles

03 · Flashing

Flashing is metal sheeting that seals the intersection of the chimney and roof to prevent leaks.

• Corrosion or rust
• Warping or dislodgement in severe weather
• Improper sealing causing leaks

04 · Brick and mortar

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

• Cracking from thermal stress
• Water damage leading to spalling
• Deterioration of mortar joints

05 · Flue liner

The flue liner is the inner lining that protects the chimney walls from heat and corrosion.

• Cracks or gaps that let heat escape
• Corrosion or rust
• Improper sizing affecting draft efficiency

06 · Smoke chamber

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

• Creosote buildup reducing efficiency
• Cracks or gaps affecting draft
• Improper shape or construction

07 · Damper

The damper controls airflow and seals the chimney when not in use.

• Rust or corrosion preventing proper sealing
• Misalignment causing drafts
• Stuck open or closed reducing efficiency

08 · Firebox

The firebox is the combustion area where you build fires.

• Cracks or missing bricks
• Erosion from heat exposure
• Creosote buildup affecting performance