Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest.
Attic sheathing wet.
This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate.
Mold on attic sheathing.
These signs can vary contingent on the catalyst of the problem and are generally worse on north facing or shady sides of roofs.
Mold growing on the sheathing in your attic is a serious problem that shouldn t be ignored.
When moisture gets into the attic it condenses on the roof sheathing in the form of frost.
There appears to be some kind of mold up there but there is no access to the attic due to a very low pitched roof.
Melting frost can lead to deteriorated roof sheathing mold on the roof sheathing wet insulation and water stains on the ceilings.
The presence of mold inside your home even if it.
Buckled or damaged roof sheathing.
Frost itself doesn t do any damage but once it melts things get wet and then damage occurs.
Water or drip marks scattered on the attic floor.
When it was investigated my husband found that the the blown in insulation was blocking the vents the bath exhaust fan hadn t been vented outside the attic and that the sheathing was extremely wet.
Moisture or frost on the roofs sheathing.
In the vast majority of cases the mold growth is caused by condensation.
How does condensation get in the attic.