Mortared verges can break away
New mortar only lasts if defective material beneath has been removed.
Dry verge uses fixings
Loose units should be repaired through the mechanical system rather than glued back in place.
Look at the gable wall too
Cracks at the top of the masonry can create damp that looks like a roof-edge leak.
Ready to get the fault inspected?
Send a wide photograph from safe ground if you have one. Close-ups are useful only when the position on the roof is clear.
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