Chimney anatomy
Every part of a chimney, what it does and what goes wrong with it.
PART 01
Chimney cap
The chimney cap sits atop the chimney and keeps rain, debris, and animals out while allowing smoke to escape.
- Rust and corrosion can cause the cap to deteriorate.
- Improper fitting can lead to leaks.
- Nest or debris accumulation can block the cap.
PART 02
Crown
The crown is a concrete or metal slab that covers the top of the chimney to protect the masonry from water damage.
- Cracks can develop from weather exposure.
- Improper sloping can lead to water pooling.
- Deterioration over time can lead to leaks.
PART 03
Flashing
Flashing is metal sheeting that seals the space where the chimney meets the roof to prevent water leaks.
- Corrosion can cause rust and leaks.
- Improper installation can lead to gaps.
- Weather damage can cause flashing to lift.
PART 04
Brick and mortar
Brick and mortar make up the main structure of many chimneys, providing support and insulation for the flue.
- Weathering can cause cracks in the bricks.
- Mortar joints can erode over time.
- Water intrusion can lead to spalling.
PART 05
Flue liner
The flue liner protects the chimney walls from heat and corrosion, improving safety and efficiency.
- Cracks or defects can develop in the liner.
- Creosote buildup can reduce effectiveness.
- Improper sizing can affect draft performance.
PART 06
Smoke chamber
The smoke chamber funnels smoke from the firebox to the flue, ensuring efficient smoke movement.
- Creosote buildup can occur here.
- Cracks in the walls can develop.
- Improper design can lead to smoke backdraft.
PART 07
Damper
The damper is a movable plate that regulates airflow and allows the chimney to be closed off when not in use.
- Rust or warping can prevent it from sealing properly.
- Cables or pull chains can break.
- Debris can block damper operation.
PART 08
Firebox
The firebox is the part of the chimney system where the fire burns, built to withstand high temperatures.
- Bricks can crack under thermal stress.
- Mortar joints can erode from heat exposure.
- Improper cleaning can lead to residue buildup.
01 · Chimney cap
The chimney cap sits atop the chimney and keeps rain, debris, and animals out while allowing smoke to escape.
- Rust and corrosion can cause the cap to deteriorate.
- Improper fitting can lead to leaks.
- Nest or debris accumulation can block the cap.
02 · Crown
The crown is a concrete or metal slab that covers the top of the chimney to protect the masonry from water damage.
- Cracks can develop from weather exposure.
- Improper sloping can lead to water pooling.
- Deterioration over time can lead to leaks.
03 · Flashing
Flashing is metal sheeting that seals the space where the chimney meets the roof to prevent water leaks.
- Corrosion can cause rust and leaks.
- Improper installation can lead to gaps.
- Weather damage can cause flashing to lift.
04 · Brick and mortar
Brick and mortar make up the main structure of many chimneys, providing support and insulation for the flue.
- Weathering can cause cracks in the bricks.
- Mortar joints can erode over time.
- Water intrusion can lead to spalling.
05 · Flue liner
The flue liner protects the chimney walls from heat and corrosion, improving safety and efficiency.
- Cracks or defects can develop in the liner.
- Creosote buildup can reduce effectiveness.
- Improper sizing can affect draft performance.
06 · Smoke chamber
The smoke chamber funnels smoke from the firebox to the flue, ensuring efficient smoke movement.
- Creosote buildup can occur here.
- Cracks in the walls can develop.
- Improper design can lead to smoke backdraft.
07 · Damper
The damper is a movable plate that regulates airflow and allows the chimney to be closed off when not in use.
- Rust or warping can prevent it from sealing properly.
- Cables or pull chains can break.
- Debris can block damper operation.
08 · Firebox
The firebox is the part of the chimney system where the fire burns, built to withstand high temperatures.
- Bricks can crack under thermal stress.
- Mortar joints can erode from heat exposure.
- Improper cleaning can lead to residue buildup.