Possible causes
- Age and thermal movement cracking old lead
- Mortar joints failing so lead pulls out
- Theft of lead
- Incorrect sizes of lead used
Warning signs
- Lead visibly lifted or missing
- Damp where a roof meets a wall or chimney
- Staining on walls below
Typical solutions
- Re-dressing and repointing existing lead
- Replacing flashing with correctly sized lead
- Alternative non-lead flashing where theft is a risk
When to call a roofer
When you can see lifted or missing lead, or damp at a roof junction.
This is general guidance. The cause of any roof problem can only be confirmed by inspecting the roof.