Chimney anatomy

01 · Chimney cap

A chimney cap sits on top of the chimney to prevent rain, debris, and animals from entering the flue.

• The cap can become clogged with debris.
• Metal caps can rust over time.
• Caps may get blown off in strong winds.

02 · Crown

The chimney crown is a concrete or mortar slab that covers the top of the chimney, protecting it from weather damage.

• Cracks can form, allowing water to seep in.
• Damage can occur from freeze-thaw cycles.
• Improper installation can lead to water pooling.

03 · Flashing

Flashing is a metal barrier that seals the space between the chimney and roof to prevent water leaks.

• Flashing can become loose over time.
• Corrosion can occur on metal flashing.
• Improper installation can lead to leaks.

04 · Brick and mortar

Brick and mortar make up the chimney structure, providing stability and protection from weather elements.

• Mortar can crumble or crack over time.
• Bricks can become loose or spalled.
• Water penetration can cause damage to the masonry.

05 · Flue liner

A flue liner ensures safe passage of smoke and gases out of the home and protects the chimney walls.

• Liners can crack or deteriorate.
• Blockages can occur from creosote build-up.
• Improper sizing can affect chimney performance.

06 · Smoke chamber

The smoke chamber funnels smoke from the firebox into the flue, helping to create an efficient draft.

• Smoke chambers can develop cracks.
• Creosote accumulation can occur in the chamber.
• Improper construction can lead to smoke issues.

07 · Damper

The damper is a moveable plate that seals the flue when the fireplace is not in use to prevent energy loss.

• Dampers can become stuck due to rust.
• The seal can degrade, causing drafts.
• Damper alignment can be affected over time.

08 · Firebox

The firebox is where the fire burns, constructed to withstand high temperatures and protect the home structure.

• Bricks can crack or spall due to heat.
• Mortar joints can deteriorate.
• Improper construction can lead to heat damage.