Most people assume this is caused by a leaking roof but that might not be the source.
Roof sweating in attic.
In the vast majority of cases the mold growth is caused by condensation.
Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest.
Water found in these places is commonly caused by condensation in the attic.
Finding water damage on the wall or ceiling is worrying for any homeowner.
The rapid cooling leads to immediate condensation.
This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate.
During the winter months the recommended relative humidity inside a house is anywhere between 30 50 percent.
This could be a sign that your excessive indoor humidity is causing damage elsewhere in places you cannot see such as.
How to stop metal roof sweating condensation dripping very easily cheaply and completely as a do it yourself diy project.
Your walls ceilings floors and your attic roof.
If there is excessive moisture accumulation in your attic it will condense on cold areas mainly on the underside of your roof deck.
It s no surprise that this tends to occur more in colder months when home heating is more common and intense.
Moisture occurs when heated air inside the home rises up to the roof where it meets the colder temperatures of outside air.