17 May 2026 ยท Chimney Repairs
Understand why chimney flashing fails and the practical repair options that stop repeat leaks.
Why chimney flashing fails
Lead flashing sits at the highest stress point where roof slopes meet masonry. Movement, old mortar joints, and weathering can break seals over time.
Common chimney leak symptoms
- Damp patches around chimney breast plaster.
- Staining in loft areas close to the stack.
- Water ingress during wind-driven rain from one direction.
- Cracked mortar around flashing chase lines.
Typical repair options
- Re-dressing or replacing failed lead flashing.
- Repointing mortar chase lines securely.
- Replacing damaged soakers on slate or tile roofs.
- Resetting loose chimney pots and capping as needed.
Next step
A targeted chimney inspection with photos helps confirm whether a small repair is enough or if deeper masonry work is needed.