condensation on walls


Old 12-21-00, 09:38 AM
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I recently purchased a home that was built in 1960. We started noticing what appears to be mold on the ceiling,top of the walls and around the lower half of the walls in our bedroom. We also noticed what looks like wet patches on parts of the ceiling and walls. Some of those patches are where the mold is and some are not. In addition most of our windows have condensation on them. We do know the house had a roof leak, but there was a new roof replaced over top of the original roof. We have checked in the attic and behind some of the drywall and know it is not a leak. Is it do to high humidity in the house? Do you think there may be either not enough insallation? Or a lack of ventilation due to the original roof still attatched?
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Old 12-23-00, 04:03 PM
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This is a ventilation problem. You either do not have enough fresh air coming in under the house/through soffits or the warmer moist air is not escaping through the roof.

I bet it's a combination of these.
Old 12-31-00, 01:59 AM
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We moved into our 1900 two story farmhouse in September. Since colder temperatures descended in November, we have experienced wet and moldy walls near the floor. There is no evidence that this has ever occurred before. Before winter set, we removed the outdated and inefficient central heating unit and replaced it with two ventless gas log fireplaces (one for each level), which do a wonderful job of keeping the home cozy and warm. If condensation on walls is caused by poor ventilation, how do you fix it? We have a couple of ceiling fans, would adding more help? To what extent can this condensation damage the drywall? Lysol seem to kill the surface mold and mildew, but is there mold and mildew growing inside the wall that we can't see?
Thanks for any help!
Old 12-31-00, 05:14 AM
Join Date: Aug 2000
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To my old farm house

The condensation is from the warm moist interior air contacting the cold wall, cooling & condensing. The solution lies in (1) getting some insulation in the wall cavity to reduce your energy costs and keep the surface of the wall warmer. Retro fit insulation can be installed from the exterior. Check your local trades for pros with the proper equipment. (2) Installing a balanced ventilation system. One which expells the humid interior air and replaces it with the same volume of fresh air from the outside. These units use the latent heat from the expelled air to warm the incoming air. Exhaust only vetilation will create a negative pressure in the house which will draw air in through cracks and cause further condensation inside the walls.

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