Black On Sheathing In Attic

I do not think the roofing is leaking there are gable end vents but no soffit vents they are looking to sell the house and do not want a problem with home inspector thanks.

Black on sheathing in attic.

Mold usually causes a musty odor and may cause staining that may be black brown gray white yellow or green. These are commonly seen underneath roof vents plumbing stacks vent hoods. The following picture is of a long standing moisture condition in an attic where much of the roof sheathing has turned black. The photo below illustrates where condensation comes from in an attic.

The insulation was contaminated and we inspected the attic side of the ceiling drywall below for signs of leak stains or mold. Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest. Attic mold cleaner attic mold removal how to clean attic mold how attic mold gets there in the first place and what to do to help prevent attic mold. When moisture condenses on plywood roof sheathing repeatedly or continuously the wood will turn black.

The mold itself may have a cottony texture but can also be velvety leathery or. This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate. In the vast majority of cases the mold growth is caused by condensation. Roof leakage can often be seen as dark black stains concentrated and radiating out from one or more individual locations.

The black attic mold shown here confirms that this attic had a serious venting and moisture problem including moisture from sources lower in the building. This can be caused by the action of fungal growth and molds and the affect they have on the tannins in the wood. This latter phenomenon occurs when the house is too humid and the warm moist air seeps into the attic where it condenses and freezes on cold attic areas. In an attic this is typically your roof sheathing or framing.