Check the wall above the bay
Open pointing, render cracks and leaking sills can feed water onto the roof below.
Lead bays need room to move
Splits often appear at folds or where old patches have stiffened the sheet.
Useful evidence: if you can take a photograph safely, include enough of the roof to show where the defect sits. A close-up without context can be surprisingly unhelpful.
Membrane bays still depend on good edges
The covering may be sound across the middle while the back upstand or corner has failed.
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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