Start with distribution
One failed slate is local. Slipped coverings, rotten battens and brittle underlay across much of the slope are a different picture.
Look at the repair history
Numerous hooks, clips and patches show how often the covering has needed attention. They do not automatically condemn it, but they help judge future maintenance.
Ask what is hidden
Battens, underlay and fixings are difficult to assess until covering is lifted. Local repairs sometimes provide useful evidence of their condition.
Get each option described
If both repair and renewal are being discussed, ask exactly what each includes. A broad replacement price is hard to compare with a carefully specified local repair.
If you are ready to get the roof inspected
Give the contractor the symptom rather than your diagnosis. The weather pattern and a few safe photographs can be useful.
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