Chimney anatomy

01 · Chimney cap

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

• Rust or corrosion can cause it to deteriorate.
• Wind damage may dislodge it.
• Debris can clog the openings.

02 · Crown

The crown is a slab that covers and seals the top of the chimney to protect it from weather damage.

• Cracking can lead to water leaks.
• Poor construction can cause early degradation.
• Weathering can erode the surface.

03 · Flashing

Flashing is a seal between the chimney and roof to prevent water from leaking into the house.

• Rust can cause it to fail.
• Improper installation may lead to leaks.
• Storm damage can dislodge it.

04 · Brick and mortar

These are the building materials forming the outer structure of the chimney.

• Cracks may develop from settling.
• Mortar can deteriorate over time.
• Water damage can erode the bricks.

05 · Flue liner

The flue liner protects the chimney walls from heat and corrosive byproducts of combustion.

• Cracking can allow heat to escape.
• Build-up of creosote can be hazardous.
• Corrosion can weaken its structure.

06 · Smoke chamber

Located above the fireplace, it funnels smoke and gases into the flue.

• Cracks can affect efficiency.
• Buildup of soot can obstruct airflow.
• Improper construction can cause drafting issues.

07 · Damper

The damper is a device that can be opened or closed to regulate airflow and prevent heat loss when the fireplace is not in use.

• Rust can cause it to stick.
• Improper sealing can lead to drafts.
• Damage from heat can warp it.

08 · Firebox

The firebox is the area where the fire burns in a fireplace.

• Heat can cause it to crack.
• Soot buildup can pose a fire risk.
• Water can cause brick to erode.