Possible causes
- Overflowing or blocked gutters and valleys
- Wind-driven rain getting under slightly lifted tiles
- Short or failed flashing that only floods in heavy rain
- Low-pitched roofs where tiles are near their limit
Warning signs
- Leaks appear only in storms or certain wind directions
- Water spilling over gutters
- Damp near eaves or valleys
Typical solutions
- Clearing and repairing gutters and valleys
- Refixing tiles and ridges
- Improving flashing details
When to call a roofer
After the second occurrence. Intermittent leaks are easiest to trace if you note the date, weather and where water appeared.
This is general guidance. The cause of any roof problem can only be confirmed by inspecting the roof.