Look at the pattern
Condensation tends to affect a broad area. Nail points may bead with water and the underside of felt can feel damp. A roof leak often follows one route, though long-running leaks can spread.
Check extract ducts
Bathroom and kitchen ducts should discharge outdoors. A loose duct dumping warm moist air into the loft can create a remarkable amount of water.
Keep eaves ventilation open
Insulation pushed tightly into the eaves can block airflow. Roofs vary, so ventilation arrangements should suit the actual construction rather than a generic diagram.
Recheck in different weather
If damp appears without rain, condensation moves up the list. If one timber becomes wet straight after rainfall, inspect the roof detail above it.
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Set out the problem plainly, including previous repairs or access difficulties that may affect the job.
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