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KNOW WHAT TO EXPECT

Cap, crown and flashing: know the difference

Chimney parts have similar names but different jobs, and mixing them up can lead to the wrong request. A cap, a crown and flashing protect different points of the chimney. Learning the terms helps you describe what you see and ask better questions.

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Sweeping & inspectionsCaps, crowns & masonryClear service decisions
Metal mesh chimney cap on a clay flue above a masonry crown.

From the fireplace to the flue. Start with the whole system.

01

Which chimney part is being discussed?

These terms describe parts of the chimney. They help name a finding, but they do not diagnose a condition or show whether a part is suitable.

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PartWhere it sitsWhy it matters to you
CapOver a flue openingA separate cover, rather than the whole chimney top.
CrownMasonry top around the flue openingsDistinct from the cap and roof junction.
FlashingRoof/chimney junctionOne component group to consider in water-entry assessment.
MasonryBrick and mortar chimney bodyCondition and proposed joint/brick work need assessment.
Flue and linerInternal vent passage and its liningInternal questions need appropriate system evaluation.
02

Does one replacement solve every leak?

No. Different components and entry routes need separate assessment. A wet spot inside the house or a photo taken from the ground cannot show which part is involved.

Keep roof, liner and structural questions separate from a guessed cap or mortar repair. Ask the professional which component was identified and what work is actually proposed.

ONE CLEAR NEXT STEP

Clearer findings.
A better next step.

Tell us about the chimney, appliance and reason for service. Start with the right questions for your property.

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Sources and local planning resources

Reviewed October 26, 2026. Confirm the appliance, inspection or repair scope and local requirements with the responsible professional.

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