Chimney flashing is the metal seal where the chimney meets the roof. It is the number-one source of chimney leaks. When it lifts, rusts, or loses its seal, water runs down between the chimney and roof into your home.
What it is
Flashing is layered metal that seals the joint between the chimney and the roof. Done right, it channels water away; when it fails, water gets straight in.
Why it leaks
Age, rust, poor original installation, lifting from roof movement, or failed sealant all break the seal. Wind-driven rain then finds the gap.
How it is repaired
Reseal minor gaps or replace failed flashing with new step and counter flashing. Fixing flashing is often the answer when a chimney leaks only during storms.
Frequently Asked Questions
How do I know it is the flashing?
Leaks during wind-driven rain, and water stains where the chimney meets the ceiling, point to flashing.
Reseal or replace?
Minor issues reseal; rusted or lifted flashing is replaced.
Is flashing a common leak source?
Yes, it is the most common.
Need a chimney sweep, inspection, or repair?
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