Green Mold On Underside Of Roof Sheathing

The mold itself may have a cottony texture but can also be velvety leathery or.

Green mold on underside of roof sheathing. This phenomenon occurs in vented attics and is more common in new homes than old homes. Increasingly homeowners in the pacific northwest are noticing mold on the underside of their roof sheathing. 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. When it s cold enough outside water vapor in an attic with improper ventilation can freeze on the underside of your roof.

Attic mold left unchecked can grow and lead to structural deterioration of attic sheathing and roof structural elements. Attic spaces are one of the most common places in a home for mold to be found growing. Mold on the underside of roof sheathing is also very common. In the vast majority of cases the mold growth is caused by condensation.

After several years of this there may be. Generally tearing off a roof and roof sheathing and perhaps roof framing to remove mold would not be sensible nor cost justified. Mold usually causes a musty odor and may cause staining that may be black brown gray white yellow or green. While this is easy to spot by the time you see it mold may have already begun to grow.

There s an underlying moisture issue that needs to be resolved because mold requires moisture to grow and spread. Showering cooking laundry even just breathing adds water vapor into the air. In most cases the moisture that causes the condensation on the roof sheathing is from occupant activity in the home below. Mold that grows on the underside of roof sheathing due to ideal mold growth conditions being present.

Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest. Frost buildup on the underside of the roof sheathing in winter. This latter phenomenon occurs when the house is too humid and the warm moist air seeps into the attic where it condenses and freezes on cold attic areas. This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate.