Water on an upstairs ceiling
Think about what lies above and uphill: open slope, chimney, valley, roof window or wall junction.
A slate or tile has moved
Photograph it from safe ground. Several disturbed areas justify a wider fixing check.
Useful evidence: keep one wide photograph that shows where the problem sits on the roof. Close-ups make more sense when the position is obvious.
Water down an outside wall
Watch the gutter in rain and check whether water is running behind the fascia.
Damp beside a chimney
Lead, pointing, masonry and the rear detail all need considering.
A recent repair did not stop the leak
Compare the weather conditions, mark the stain and find out exactly what was changed.
Want a roofer to look at it?
Describe what you can see and the weather in which the problem appears. That gives the roofer a useful starting point.
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