Mold On Roof Sheathing

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 on roof sheathing.

Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest. It s covering the rafters and the roof sheathing and there s even some stuff on the insulation. Mold is a fungus that grows in the form of multicellular filaments called hyphae. In the vast majority of cases the mold growth is caused by condensation.

There are many different species of mold and only lab testing can confirm the particular type of mold in any given. Generally tearing off a roof and roof sheathing and perhaps roof framing to remove mold would not be sensible nor cost justified. One puzzling aspect of the phenomenon is that the mold is found in well built homes that comply with all relevant building codes. This condition may be consistent with the effects of night sky radiation.

Where do you go from here. The inspector noted that the mold wasn t on the rafters. Mold on the underside of roof sheathing is also very common. So a house that we are in contract to buy just came back with mold in the attic sheathing of the roof.

Mold that grows on the underside of roof sheathing due to ideal mold growth conditions being present. 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. There is some staining discoloration and or mold or mold like fungal growth present on the roof sheathing in the attic.

Increasingly homeowners in the pacific northwest are noticing mold on the underside of their roof sheathing. This phenomenon occurs in vented attics and is more common in new homes than old homes. Mold can weaken structural elements of your home like the rafters and roof sheathing. This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate.

Mold can form but often it is. 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. Combine 1 2 cup chlorine bleach with. And it seemed to be localized to one side of the sheathing not the other.