It was built in 1978 and when we bought it a couple of years ago the roofing was replaced as part of the sale agreement along with a couple sheets of roof sheathing additional round 3 soffit vents put in and mold mitigation.
Fungus on roof sheathing.
Mold on the underside of roof sheathing is also very common.
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 attic sheathing.
This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate.
To clean mold off a roof start by putting on rubber gloves a breathing mask and goggles to protect yourself from the harsh cleaning chemicals.
In the vast majority of cases the mold growth is caused by condensation.
Mold that grows on the underside of roof sheathing due to ideal mold growth conditions being present.
Then use a long handled brush to scour the surface of the shingles and loosen stuck on mold while it s dry and brittle.
Generally tearing off a roof and roof sheathing and perhaps roof framing to remove mold would not be sensible nor cost justified.
Cleaning the sheathing kills the mold and prevents it from producing spores.
If there is a leak in the roof plumbing or windows the mold will reappear if the water is still getting into the.
Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest.