In the vast majority of cases the mold growth is caused by condensation.
Attic side sheathing.
Georgia recognized this problem about a decade ago and started requiring all attic kneewalls to have sheathing on the attic side and to be insulated to at least r 18.
Rafters sheathing joists attic side of fascia boards etc.
I ve seen osb oriented strand board.
Check for areas of dark discoloration staining of wood e g.
Use a zippered insulated tent to keep the enclosure draft free attic tent at 7 attic cover insulator 120.
Mold on the underside of roof sheathing is also very common.
Add weatherstripping around the perimeter and a sweep to the door of a walk up attic.
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.
Attic hatch or door.
Below are a few ways to check for possible roof leaks.
Mold on attic sheathing.
Attic spaces are one of the most common places in a home for mold to be found growing.
Mold must be removed from attic sheathing because the spores can cause serious health problems.
Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest.
Pull down stair or ladder.
The effects of mold exposure depend on your health and the amount of mold you re.