Chimney anatomy

01 · Chimney cap

The chimney cap sits on top of the chimney to keep rain, animals, and debris out while allowing smoke to escape.

• Can become clogged with debris
• May rust or deteriorate over time
• Can be blown off during strong winds

02 · Crown

The chimney crown is the top surface of the chimney, designed to protect the chimney structure from weather damage.

• Can crack from weather exposure
• May deteriorate due to aging
• Allows water penetration if damaged

03 · Flashing

Chimney flashing is installed where the chimney meets the roof to prevent water leaks.

• May become loose or detached
• Can corrode over time
• Allows water leaks if improperly installed

04 · Brick and mortar

The chimney masonry consists of bricks and mortar, forming the structure of the chimney.

• Bricks can crack or spall
• Mortar joints may erode
• Water damage can cause deterioration

05 · Flue liner

The flue liner runs inside the chimney, protecting the chimney walls from heat and corrosion.

• Can crack or wear out over time
• Might be improperly sized
• Erosion from creosote buildup

06 · Smoke chamber

The smoke chamber funnels smoke from the firebox into the flue, improving chimney draft.

• Creosote buildup can occur
• Cracks may form over time
• Improper construction can affect draft

07 · Damper

A damper controls airflow and prevents heat loss by sealing the chimney when not in use.

• Can become stuck open or closed
• May rust or corrode
• Warps due to heat exposure

08 · Firebox

The firebox is where the fire actually burns, built to withstand high temperatures.

• Bricks or panels can crack
• Can become dirty or coated with soot
• Mortar joints may erode