1. Failed or slipped roof tiles
A single broken tile can pour water into the ceiling on a wet Friday, we saw exactly that in Dallington, watertight by 6pm the same day with a sourced spare tile. Concrete tiles crack with age, frost, and foot traffic; one gap is enough.
2. Pipe boots, chimneys, and skylight flashings
Flat planes rarely leak first. Water enters at penetrations where rubber boots perish, chimney aprons lift, or skylight curbs were never detailed for wind-driven rain. Nor'wester rain pushes uphill at laps, flashings are the weak point.
3. Lifted fixings and tired screw lines
Nail-fixed long-run works loose over time, whether the roof was fixed with older lead-head nails or later twisted-shank nails. Water enters through the lifted fixing and the hole in the sheet around it. A full re-screw programme fixes sound steel; perforated sheets need replacement.
4. Blocked valleys and overflowing spouting
Internal valleys carry huge volume in plains downpours. Leaves and silt let water back up under the cladding. Overflowing spouting dumps water on cladding and into eaves, we often find the leak is drainage, not the main roof field.
5. Storm and wind damage
Sumner storm leaks with crew on site within the hour; Prebbleton wind damage the same. Lifted sheets, torn flashings, and debris impact need make-safe first, then permanent repair in dry weather.
6. Condensation versus a true leak
Drips on cold clear mornings can be attic condensation, especially with poor ventilation under long-run. If it stops when weather clears and stains only appear after rain, you are usually dealing with a roof fault. We distinguish the two on inspection.
What to tell us when you call
When the leak appears, during rain, only in a nor'wester, or after valleys overflow, narrows the search fast. Photos of ceiling stains help; calling first matters more than a perfect picture.