Black On Sheathing In Attic

The following picture is of a long standing moisture condition in an attic where much of the roof sheathing has turned black.

Black on sheathing in attic.

This summer i cleaned the portion of the black stain with a dry mop as much as i could reach from the hatch opening. When moisture condenses on plywood roof sheathing repeatedly or continuously the wood will turn black. The presence of mold inside your home even if it s in an unused place such as the attic can cause. Black or white staining in attic.

Something else you can do to help is get. This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate. I have surface mold on the sheathing in my 1982 vintage 12 6 pitched attic. This can be caused by the action of fungal growth and molds and the affect they have on the tannins in the wood.

Last winter i took a look into the attic and noticed black stains and water marks on a portion of the sheathing material. In the attic photograph at left we show a mix of green gray and white attic mold. While the black stains are either mould or just black dust from attic insulation settled on the. Mold on attic sheathing.

The photo at page top shows white attic mold on the roof sheathing and rafters and some brown or black mold on the attic side of ceiling drywall where we pulled back insulation. If your attic sheathing doesn t look like new construction and is visibly black or white stained like this picture you likely have a ventilation issue that needs to be addressed and mold remediated. Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest. I m aware of the cause poorly vented bathroom fans and not well sealed fan fixtures lights wires etc.

Why does attic mold rarely if ever affect indoor air quality in homes. When looking for attic mold trace both leak. Mold growing on the sheathing in your attic is a serious problem that shouldn t be ignored.