In the vast majority of cases the mold growth is caused by condensation.
Attic side sheathing.
Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest.
Mold must be removed from attic sheathing because the spores can cause serious health problems.
Roof leaks will often lead to a small localized area of attic mold near where the leak is occurring.
The best way to provide that sheathing is to use a rigid material.
Use a zippered insulated tent to keep the enclosure draft free attic tent at 7 attic cover insulator 120.
Attic spaces are one of the most common places in a home for mold to be found growing.
Pull down stair or ladder.
The presence of mold in your attic is often the result of poor ventilation insufficient insulation moisture from a roof leak or improper venting from your bathrooms or kitchen.
Mold on the underside of roof sheathing is also very common.
Attic hatch or door.
Mold on attic sheathing.
I ve seen osb oriented strand board.
This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate.
Rafters sheathing joists attic side of fascia boards etc.
Add weatherstripping around the perimeter and a sweep to the door of a walk up attic.
The effects of mold exposure depend on your health and the amount of mold you re.
Affix rigid foam insulation to the attic side of the hatch or door.