The best way to provide that sheathing is to use a rigid material.
Attic side sheathing.
Roof leaks will often lead to a small localized area of attic mold near where the leak is occurring.
Mold on attic sheathing.
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.
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.
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.
Pull down stair or ladder.
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.
Mold must be removed from attic sheathing because the spores can cause serious health problems.
Rafters sheathing joists attic side of fascia boards etc.
I ve seen osb oriented strand board.
Below are a few ways to check for possible roof leaks.
This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate.
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.
Attic hatch or door.