The chief cause of attic mold is poor ventilation.
Mold in roof attic.
Also notice the condensation stains at the shingle nail more evidence of a history of attic moisture which was a factor in this mold growth.
The photo at the left was identified as a toxic mold that probably should be removed although the ease of movement generally tearing off a roof and roof sheathing and perhaps roof framing to remove mold would not be sensible nor cost justified.
There s an underlying moisture issue that needs to be resolved because mold requires moisture to grow and spread.
Click photo for larger image.
Particularly in cold climates when homeowners heat their homes in winter hot air tends to escape through the attic.
Wooden beams and plywood may be affected and it can be difficult to remove all traces of mold from wooden surfaces.
Insulation is often affected.
This occurs efficiently in attics with proper ventilation but attic mold can occur if the hot air meets the cold surface of the attic roof and creates condensation.
If you have mold in the attic we recommend consulting with a mold removal specialist because.
The mold shown in the attic photographed above was identified as aspergillus sp.
In the vast majority of cases the mold growth is caused by condensation.
This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate.
Heating ventilation and air conditioning ducts may also.