Chimney anatomy

01 · Chimney cap

The chimney cap sits on top of your chimney and prevents rain, debris, and animals from entering.

• The cap can become rusted and deteriorate over time.
• Damage from strong winds can loosen or dislodge the cap.
• Debris can accumulate around the cap, leading to blockages.

02 · Crown

The chimney crown is a concrete or mortar structure that covers the top of the chimney to protect it from weather elements.

• Cracks can develop in the crown, allowing water to seep in.
• Erosion from rain can wear down the crown's surface.
• Freeze-thaw cycles can cause the crown to chip or fracture.

03 · Flashing

Flashing is the metal barrier that seals the gap between the chimney and the roof, preventing leaks.

• Flashing can come loose, creating gaps for water to penetrate.
• Corrosion of the metal can lead to leaks.
• Improper installation can cause water to seep between the roof and chimney.

04 · Brick and mortar

The brick and mortar make up the structural body of the chimney, providing stability and support.

• Mortar can crack and crumble over time, weakening the structure.
• Bricks can chip or spall due to weather exposure.
• Water infiltration can lead to moss or algae growth on the masonry.

05 · Flue liner

The flue liner serves as a protective layer inside the chimney, guiding smoke and gases out of the home safely.

• The liner can crack, allowing gases to escape into the home.
• Creosote can build up, increasing the risk of a chimney fire.
• Improper sizing can lead to inefficient draft and poor combustion.

06 · Smoke chamber

The smoke chamber is located above the firebox and below the flue, directing smoke from the fire into the flue.

• Smoke chamber walls can become rough, causing smoke to cool and deposit creosote.
• Cracks in the chamber can allow heat and smoke to escape.
• Poor design can result in downdrafts or smoke spillage.

07 · Damper

The damper is a device that seals the chimney when not in use, preventing drafts and heat loss.

• Damper can get stuck, making it hard to open or close.
• Rust from moisture can weaken the damper mechanism.
• Improper sealing can lead to air leakage and energy loss.

08 · Firebox

The firebox is the area where the fire burns, usually lined with firebrick to withstand high temperatures.

• Bricks inside the firebox can crack due to intense heat.
• Deterioration of the mortar joints can compromise the firebox integrity.
• Excessive soot buildup can reduce the efficiency of the firebox.