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Re: Moisture in the attic

Posted By: Roger
Friday, 9 February 2001, at 8:46 p.m.

In Response To: Moisture in the attic (Joe P.)

Joe ------- I agree with everything the other Joe says and would like to add several additional thoughts. Your basic problem (moisture condensing in the attic space) is caused by not having enough venting for that area. There should be enough airflow so the temperature is not much different than the outside air. Cold air has a much lower capacity to hold moisture. By keeping the air this cold though, means you should have sufficient insulation over the ceiling areas to keep your heating bills down.

Ideally, you would also have some type of moisture barrier in the ceiling to lessen the amount of moisture that migrates from the warm, moist interior of the house into the cold dry attic. Also, you should check to see if warm air is being allowed to escape into the attic through any openings (attic hatches, recessed light fixtures, heat vents, etc) and most important: check to see if the bathroom fans are exhausting into the attic or direct to the outside.

If you have sufficient venting in the attic and a reasonably tight ceiling you should not have to worry about humidity levels in the house. Condensation on your windows is a good indicator if your humidity levels are too high. Good luck, Roger

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