Accepted Answer

I believe that the new furnace you have installed with the humidifier is introducing an increased amount of moisture into the air of the home that is ultimately escaping into the attic. The moisture in the attic and the temperature differences are causing this condensation to occur.

Depending on how wet the insulation in the attic is now, there is a good possibility that it will need to be removed and replaced. Steps to be taken to reduce moisture escaping into the attic are:

- Seal around all electrical outlets that are in the ceiling to the attic with caulking.
- Seal holes in the sill plates of interior walls to the attic.
- Attic hatches are also sources of moisture entry into the attic (cover with plastic or
insulation.)
- Make sure the bathroom exhaust is vented outside.
- If you remove the insulation, a layer of 6ml vizqueen can be put down prior to the new
insulation giving you a continuous moisture barrier between the warm humid air of the
house and the cool air of the attic.
- Seal any conceivable entrance from the home into the attic.

Effective roof venting typically works in combination between the soffit vents and the roof vents. Roof vents alone are typically insufficient because you need cross ventilation in conjuction with soffit vents. Make sure that your soffit vents are clear and not covered by insulation.

It would be a good idea to contact a local contractor to come and inspect your attic and address these issues. Preventing the moist air from entering the attic and properly venting the attic now that you have a new furnace with a humidifier.

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Thank you,
XXX X.

Expert:	Home Improvement Jay
Pos. Feedback:	99.0 %
Accepts:	345
Answered:	1/27/2009

General Contractor

7 years exp. residential home and pool construction; mold, fire and flood remediations.