Green Mold On Underside Of Roof Sheathing

While this is easy to spot by the time you see it mold may have already begun to grow.

Green mold on underside of roof sheathing.

Mold on the underside of roof sheathing is also very common. This phenomenon occurs in vented attics and is more common in new homes than old homes. After several years of this there may be. Increasingly homeowners in the pacific northwest are noticing mold on the underside of their roof sheathing.

Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest. Due to the stack effect warm air rising this moisture slowly migrates toward the attic. This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate. Attic mold left unchecked can grow and lead to structural deterioration of attic sheathing and roof structural elements.

There s an underlying moisture issue that needs to be resolved because mold requires moisture to grow and spread. In most cases the moisture that causes the condensation on the roof sheathing is from occupant activity in the home below. Generally tearing off a roof and roof sheathing and perhaps roof framing to remove mold would not be sensible nor cost justified. In the vast majority of cases the mold growth is caused by condensation.

Showering cooking laundry even just breathing adds water vapor into the air. When it s cold enough outside water vapor in an attic with improper ventilation can freeze on the underside of your roof. 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.

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. Attic spaces are one of the most common places in a home for mold to be found growing. The mold itself may have a cottony texture but can also be velvety leathery or. Mold usually causes a musty odor and may cause staining that may be black brown gray white yellow or green.