Roof Sheathing Mold

Generally tearing off a roof and roof sheathing and perhaps roof framing to remove mold would not be sensible nor cost justified.

Roof sheathing mold.

Mold growth provided it is not just cosmetic mold which can simply be left alone can be cleaned from wood surfaces by blasting scrubbing or even simple surface wiping depending on the surface accessibility and smoothness. 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. Because wood is porous it may be difficult to remove the mold stains from sheathing but you can kill the mold by cleaning the sheathing with bleach and water. This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate.

Mold that grows on the underside of roof sheathing due to ideal mold growth conditions being present. What caused the mold and why did it thrive in this attic space. This phenomenon occurs in vented attics and is more common in new homes than old homes. A close examination of the photo above reveals large amounts of mold on the underside of the roof sheathing.

The insulation was improperly installed over the soffit vents blocking air from entering the attic. Attic spaces are one of the most common places in a home for mold to be found growing. One puzzling aspect of the phenomenon is that the mold is found in well built homes that comply with all relevant building codes. In the vast majority of cases the mold growth is caused by condensation.

Increasingly homeowners in the pacific northwest are noticing mold on the underside of their roof sheathing.