I have a turbine type ventilator installed on the roof. It was installed several years ago to improve a humidity problem which has since been resolved.
Within the past year we have noticed a slight leak in the kitchen pantry exactly beneath the ventilator. Water is evident only a few time a year and I cannot determine where it is coming from. I inspected the ventilator but did not see any obvious cracks in the base. I applied tar around the base in case there was a crack in the roof near the base, but the problem has not been solved.
The problem appears only certain times like after a heavy rainfall or snow, but it is not always consistent. Any ideas?