A stain that grew only after a full house
The property
A tall older house near the seafront, used as a second home and lent to family, with a first-floor bathroom above the dining room.
The problem
A brown mark on the dining room ceiling grew after busy weekends and dried out when the house stood empty. Between visits the meter stayed still.
How we found it
Moisture mapping showed the ceiling wettest beneath the toilet. We ran the basin, bath and shower, then flushed repeatedly; only flushing pushed the readings up, and the thermal camera showed cold spreading from the pan.
The outcome
The connector behind the toilet pan leaked with each flush. We fitted a new one before leaving, at the repair price agreed in advance; no floorboards came up.