This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate.
Black mold on roof plywood.
Best procedures for cleaning mold contaminated wood.
If you discover an infestation it is vital that you address it immediately to avoid hazardous damages.
The attic is truss framed with plywood sheathing.
The roof has baffles at alternating thusses soffit and ridge vents.
Mold rots and wears away roofing surfaces allowing the roof to sag leak and eventually cave in.
The white blown in insulation was used.
Easily kill mold with a vinegar spray.
To prevent future mold growth remove the source of moisture causing it.
On the east side only there is black mold for the first 6 up the slope.
What s causing black mold under roof sheathing.
The black mold is on the first 3 truss panels.
If there is a leak in the roof plumbing or windows the mold will reappear if the water is.
Mold is a very real threat to the integrity of your home.
This article offers advice on cleaning mold found on surfaces of un finished wooden building materials such as framing lumber rafters floor joists wall studs and building roof wall and floor sheathing such as plywood tongue and groove pine boards and other structural wood surfaces in buildings.
When moisture condenses on plywood roof sheathing repeatedly or continuously the wood will turn black.
This can be caused by the action of fungal growth and molds and the affect they have on the tannins in the wood.
Prevent future mold growth.
Move any un moldy plywood boards to a new storage area or remove the cause of the mold to prevent mold from growing on other boards.
Mold usually grows due to excess moisture in the area either in the air or on a surface.
Skips a few trusses and reappears on the next panel or two.
Black mold in attic.
Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest.
On the east side of the house only the plywood for the first three trusses is black for about 6 feet up from the eaves.
The following picture is of a long standing moisture condition in an attic where much of the roof sheathing has turned black.