Water found in these places is commonly caused by condensation in the attic.
Roof sweating in attic.
Moisture occurs when heated air inside the home rises up to the roof where it meets the colder temperatures of outside air.
In the vast majority of cases the mold growth is caused by condensation.
This could be a sign that your excessive indoor humidity is causing damage elsewhere in places you cannot see such as.
It s no surprise that this tends to occur more in colder months when home heating is more common and intense.
Most people assume this is caused by a leaking roof but that might not be the source.
Roof condensation has a very specific cause.
During the winter months the recommended relative humidity inside a house is anywhere between 30 50 percent.
The rapid cooling leads to immediate condensation.
Finding water damage on the wall or ceiling is worrying for any homeowner.
If there is excessive moisture accumulation in your attic it will condense on cold areas mainly on the underside of your roof deck.
Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest.
Excessive indoor humidity can cause blistering and peeling paint warping and rotting wood as well as the formation of mildew mold.
Your walls ceilings floors and your attic roof.