What causes water to drip from the ceiling exhaust fan in our bathroom

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We notice it when there is frost on the roof

  4 answers
  • Pg Pg on Nov 20, 2017
    Sounds like the flashing next to that vent must need resealing.

  • Joy30150932 Joy30150932 on Nov 20, 2017
    You are getting condensation from the fan when the humidity inside the pipe creates a frost and then melts. If you can, insulating the pipe should help.

  • Limbo Forest Limbo Forest on Nov 21, 2017
    It could be either of the above. When mine was doing the same thing it was flashing on the roof not sealed properly. 16 years later My central AC/heating vents appeared to be leaking. Turned out another vent was leaking from a different flashing seal, and water was running down a beam in the attic and coming down the side of the vent.

  • 27524803 27524803 on Nov 30, 2017
    Could be condensation from the super cold air outside... or the flashing around your vent pipe has gone deteriorated and needs to be replaced or re-sealed.... the roof in that area could be compromised too.