What to do about a wet attic.
Attic plywood wet.
Inner plywood of roof wet.
If any moisture makes its way to the plywood the damp plywood will dry out on hot sunny days.
The second variable is the species of wood used in the plywood.
Plywood is original 49 years old.
Black mold in attics.
Most attics are dry plywood is a smart vapor retarder with variable permeance.
The attic vents provide a secondary method to help everything.
2 layers of shingles.
Wanted to add more cellulose but installer said it would make wet roof worse.
In this photo of very dark mold in an attic in a wet attic mold which we found to be brown in the microscope looked black on the plywood.
Quite often the roof flashing is defective and needs replacement.
Some woods are much more resistant to rot and fungal attacks.
Attic venting attic moisture and ice dams.
It s not a vapor barrier.
Not wet but some areas slightly damp.
Wet sheathing was found in attic area due to lack of venting.
As i m sure you know building codes require this type of attic to be vented.
If the sheathing either boards plywood or composite board along the lower edge of the roof is soaked and you can see a corresponding accumulation of ice on top of the roof ice damming is occurring.