Ground-level photographs can show subtle movement
A slate that has shifted sideways by an inch may still be on the roof but have lost enough overlap to leak.
Debris on the ground gives clues
Broken tile corners, ridge mortar and pieces of slate can show which part of the roof has moved.
Temporary weathering may come first
If the roof cannot be repaired safely during bad weather, the first visit may only secure the area until proper access is possible.
Need somebody to price the repair?
Tell the roofer what you have actually seen. Let the inspection decide whether the repair is local or whether a wider section needs attention.
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