Mold On Roof Sheathing

Mold that grows on the underside of roof sheathing due to ideal mold growth conditions being present.

Mold on roof sheathing.

This condition may be consistent with the effects of night sky radiation. And it seemed to be localized to one side of the sheathing not the other. 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. It s covering the rafters and the roof sheathing and there s even some stuff on the insulation.

The inspector noted that the mold wasn t on the rafters. Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest. 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. Where do you go from here.

Another common concern with mold in the home is exposure to airborne mold spores. He believes that poor ventilation was to blame and that by installing a ridge vent would prevent any. In the vast majority of cases the mold growth is caused by condensation. Mold can form but often it is.

There is some staining discoloration and or mold or mold like fungal growth present on the roof sheathing in the attic. 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. After several years of this there may be dark rings around protruding roofing nails and larger dark spots or areas on the roof sheathing and or exterior gable walls.

Mold can weaken structural elements of your home like the rafters and roof sheathing. This phenomenon occurs in vented attics and is more common in new homes than old homes. There are many different species of mold and only lab testing can confirm the particular type of mold in any given. Mold is a fungus that grows in the form of multicellular filaments called hyphae.

One puzzling aspect of the phenomenon is that the mold is found in well built homes that comply with all relevant building codes. Increasingly homeowners in the pacific northwest are noticing mold on the underside of their roof sheathing. If you don t find the source of the moisture in your attic and fix the problem it will only get worse. Generally tearing off a roof and roof sheathing and perhaps roof framing to remove mold would not be sensible nor cost justified.