Possible causes
- Heavier replacement tiles on timbers not designed for them
- Rot in rafters or battens from long-term leaks
- Removed or altered roof timbers
- Age and settlement
Warning signs
- A visible dip along the ridge or roof slope
- Cracks in internal ceilings or walls upstairs
- Doors upstairs sticking
Typical solutions
- Inspection of the roof structure
- Timber repairs or strengthening — sometimes with a structural engineer
- Re-roofing where the covering and timbers have failed
When to get it inspected
Promptly. A sag can have several causes, some of them structural, so it should always be inspected rather than guessed at.
This page is general guidance, not a diagnosis. Call 01322 902061 to book an inspection, or read about our new roofs & re-roofing service.