Check the wall above the bay
Rain can reach the bay roof from cracked pointing, render or a leaking sill.
Lead bays can split at folds
Old patches can make the sheet too rigid and put extra stress on nearby areas.
Membrane bays still rely on good edges
A sound-looking centre section does not rule out a leak at the back upstand or corner.
Want somebody to look at the problem?
If you can take a photograph safely from the ground, include one that shows the whole area of roof.
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