Mold In Roof Sheathing

One puzzling aspect of the phenomenon is that the mold is found in well built homes that comply with all relevant building codes.

Mold in roof sheathing.

Appears due to this incorrect installation mold is forming on the underside of the roof sheathing. Mold on roof sheathing. Frost buildup on the underside of the roof sheathing in winter when it s cold enough outside water vapor in an attic with improper ventilation can freeze on the underside of your roof. This makes it especially easy to spot.

Even if they replace the roof sheathing and install a ridge vent what do we need to do to address the mold. Combine 1 2 cup chlorine bleach with. 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. 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.

This phenomenon occurs in vented attics and is more common in new homes than old homes. In the vast majority of cases the mold growth is caused by condensation. Attic spaces are one of the most common places in a home for mold to be found growing. Increasingly homeowners in the pacific northwest are noticing mold on the underside of their roof sheathing.

If your state doesn t allow you to take a sample to send to a lab recommend testing by a certified mold assessor. Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest. When an attic is stuffy that indicates you have a ventilation problem which often results in mold problems. Will the ridge vent prevent any additonal mold problems.

Attic insulation incorrectly installed and blocking soffit vents on north side of home. Mold on the underside of roof sheathing is also very common. Mold is a common problem in moist areas or places that are prone to flooding or leakage. 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. Since osb is a cellulose based material most of the time it already contains mold spores and only requires moisture to trigger the growth process. Mold can form but often it is. 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.

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