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I have a 30 yr old bungalow. Last year we replaced every door and window in our house to make it more energy efficient. Our main heating source is an air-tight wood fireplace which runs all day every day. Our back up heat source is electric radiant in the ceilings which we keep around 12°C to keep our electric bill down. We have no furnace or duct work in our house. We are having problems with moisture forming and dripping from our ceilings on colder winter days. How can we fix this problem?

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Do you have any insulation in the attic space above your ceilings? – Niall C. Dec 29 '11 at 16:41
Yes, we have R20 value. – Jeannette Dec 29 '11 at 16:43
Do you have a bathroom exhaust fan, and a range hood exhaust fan? – Tester101 Dec 29 '11 at 16:56
R20 isn't really sufficient in the attic space - R40+ is I think what you usually want to target. – robertvoliva Dec 29 '11 at 19:48

The most likley cause of the moisture is too much humidity.

Some solutions:

  • A dehumidifier
  • Fans to vent/move air around (to outside)
  • Increased Insulation in the attic (to avoid a large temperature difference between the ceiling and the attic)

Basically the humidity needs to be lowered inside the house.

You can get a Hygrometer to measure the humidity to see where it is at. If it is above 60% then its definately a bit humid.

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