Heating ventilation and air conditioning ducts may also.
Mold in attic roof.
If you have mold in the attic we recommend consulting with a mold removal specialist because.
Insulation is often affected.
The most common cause of attic mold by far is blocked or insufficient ventilation.
What causes attic mold.
This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate.
Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest.
Improper exhausting of bathroom fans or dryer vents.
Dryer exhaust vents kitchen exhaust fans and bathroom exhaust fans.
Blocked or insufficient ventilation.