Chimney anatomy

01 · Chimney cap

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

• The cap can become damaged or displaced by strong winds.
• Rust can cause deterioration over time.
• Missing or poorly fitted caps allow water and pests to enter.

02 · Crown

The crown is a concrete or mortar slab that seals the top of the chimney around the flue.

• Cracks in the crown can let water seep into the chimney.
• Poor construction can lead to early deterioration.
• Erosion from weather can wear down the crown's surface.

03 · Flashing

Flashing is a waterproofing material that seals the intersection of the chimney and roof.

• Improper installation can lead to leaks.
• Metal flashing can corrode over time.
• Weather can cause the flashing to lift or separate.

04 · Brick and mortar

Brick and mortar form the structural part of the chimney, providing shape and stability.

• Mortar joints can crack and crumble over time.
• Bricks can become loose or spalled due to freeze-thaw cycles.
• Water penetration can weaken the structural integrity.

05 · Flue liner

A flue liner protects the chimney walls from heat and corrosion while guiding smoke out.

• Liners can crack due to intense heat or chimney fires.
• Corrosion can occur over time, especially in metal liners.
• Poor installation can lead to ineffective smoke evacuation.

06 · Smoke chamber

The smoke chamber funnels smoke from the firebox to the flue, smoothing the flow to the outside.

• Soot and creosote buildup can occur in the smoke chamber.
• Improper design may cause backdrafts.
• Cracks and gaps can allow smoke to escape into the home.

07 · Damper

The damper is a movable plate in the flue that regulates air flow and drafts.

• Dampers can rust or warp, preventing proper closure.
• Debris can obstruct the damper's function.
• Improperly sealed dampers allow cold air and drafts when closed.

08 · Firebox

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

• Bricks in the firebox can crack due to the heat.
• Mortar joints can deteriorate from constant use.
• Improper ventilation can lead to inefficient burning.