Roof Sweating In Attic

The rapid cooling leads to immediate condensation.

Roof sweating in attic.

Finding water damage on the wall or ceiling is worrying for any homeowner. During the winter months the recommended relative humidity inside a house is anywhere between 30 50 percent. Roof condensation has a very specific cause. Water found in these places is commonly caused by condensation in the attic.

If there is excessive moisture accumulation in your attic it will condense on cold areas mainly on the underside of your roof deck. 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. Moisture occurs when heated air inside the home rises up to the roof where it meets the colder temperatures of outside air.

Most people assume this is caused by a leaking roof but that might not be the source. This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate. It s no surprise that this tends to occur more in colder months when home heating is more common and intense. Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest.

This could be a sign that your excessive indoor humidity is causing damage elsewhere in places you cannot see such as.