Recurring leaks in different places
One local leak can often be repaired. Repeated water entry across separate roof areas may indicate wider problems with coverings, fixings, underlay or roof details.
Widespread tile or slate deterioration
Multiple cracked, porous, delaminating or slipping coverings suggest the roof is no longer failing in one isolated spot. The battens and underlay below may also be approaching the end of their serviceable life.
Failing underlay and battens
Older roof underlay can become brittle or damaged. Battens may deteriorate where moisture has persisted. Their condition is difficult to confirm fully without lifting coverings, but repeated defects can provide warning signs.
The right decision follows a survey
Age alone does not decide whether a roof should be replaced. Its material, installation, exposure, maintenance and current condition all matter. A survey should compare a defined repair with the likely performance of the remaining roof.
Questions about this guide.
How old does a roof have to be before it needs replacing?
There is no single age. Material, exposure, installation and maintenance can make roofs of the same age perform very differently.
Can an old roof still be repaired?
Yes, when the fault is defined and the surrounding roof remains serviceable. The value of the repair depends on the wider condition.