Chimney anatomy

01 · Chimney cap

A chimney cap sits on top of the chimney and prevents rain, snow, and debris from entering, while keeping animals out.

• Can become rusted or damaged over time
• May blow off in strong winds
• Clogs with debris if not maintained

02 · Crown

The crown is the top surface of the chimney, designed to shed water away from the bricks and mortar.

• Cracks from temperature changes
• Water pooling can lead to leaks
• Erosion from weather exposure

03 · Flashing

Flashing is the metal barrier that seals the space between the chimney and the roof, preventing water infiltration.

• Can corrode or rust over time
• Improper installation may lead to leaks
• Can pull away due to roof movement

04 · Brick and mortar

The bricks and mortar make up the structure of the chimney and contain the heat and smoke.

• Deterioration from moisture and freeze-thaw cycles
• Cracks can develop from settling or heat stress
• Mortar joints may erode over time

05 · Flue liner

The flue liner protects the chimney walls from heat and corrosion, while also improving the safe flow of gases.

• Cracks from chimney fires or age
• Corrosion from acidic condensate
• Improper sizing can affect draft

06 · Smoke chamber

The smoke chamber funnels smoke from the firebox into the flue, allowing it to exit the home.

• Creosote buildup can restrict flow
• Cracks can reduce efficiency
• Soot accumulation affects performance

07 · Damper

The damper is a movable plate that closes the flue when the fireplace is not in use, conserving heat and energy.

• Warping from prolonged heat exposure
• Rust that prevents proper sealing
• Difficulty in opening or closing

08 · Firebox

The firebox is the compartment where the fire burns, constructed to withstand high temperatures.

• Cracks from heat and thermal stress
• Brick or mortar damage from repeated use
• Accumulation of soot and ash