Once you notice black fungi growing in one part of the attic there could be a probability that it has been spreading to other areas.
Black around nails in attic.
The dark spots are only around the nails and on the floor below the nails.
Roof leakage can often be seen as dark black stains concentrated and radiating out from one or more individual locations.
I live in nj.
For attic ventilation apart from soffits i also have a power vent which operates based on temperature.
Even our poorly vented attic below left was not as severely wet and moldy as the attic in grudzinski s photos above.
Ive seen roof shingle nails get rusty due to poor ventilation as this attic had lousy ventilation but never black and the sheathing turn black around the nail.
The presence of mold inside your home even if it.
Our example photos below show characteristic rust stains around roofing nails in a poorly vented attic below left and the absence of those stains around roofing nails in a well ventilated attic below right.
Mold growing on the sheathing in your attic is a serious problem that shouldn t be ignored.
And i suspect this happens during winter.
If these isolated spots are seen away from these roof penetrations then the roof may be damaged and leaking.
Does mold on attic sheathing have to be removed.
Would this be mold starting at each nail site and is this black nails due to poor ventilation or old roof leaking at all the nail penetrations.
After several years of this there may be dark rings around protruding roofing nails and larger dark spots or areas on the roof sheathing and or exterior gable walls.
Precautions need to be taken to take you those around you and the environment as safe as possible.
Deficiency of vitamin b6 and b12 is the chief cause of having dark skin around the nails.
Taking nourishing food is vital therefore you should add food containing vitamin b6 and b12 in your diet.
Mold can form but often it.
So likely the nails are very cold in winter and warm air in attic condenses around that.
Roof is new 5 yrs over an old layer.
Be sure to inspect the entire area to rule out the possibility of other fungi affected.