Black On Underside Of Roof

A 10 x 10 area of plywood has been removed to provide air into this area.

Black on underside of roof.

In the vast majority of cases the mold growth is caused by condensation. Organic materials to feed off moisture warmth and darkness. The mold itself may have a cottony texture but can also be velvety leathery or. Mold that grows on the underside of roof sheathing due to ideal mold growth conditions being present.

This can be caused by the action of fungal growth and molds and the affect they have on the tannins in the wood. Warm wet air rises and meets the cold roof and cools. After several years of this there may be. Mold requires a few key elements in order to grow and thrive.

Picture a cloud of moisture floating overhead between the rafters. Black mold growth on the underside of your roof and ceiling can be extremely common in some areas. This can be a problem for many homeowners and needs to be addressed as soon as it is found to avoid the consequences it can bring. At the south end of the roof the ridge changes direction causing an overlay condition.

These are commonly seen underneath roof vents plumbing stacks vent hoods. Mold usually causes a musty odor and may cause staining that may be black brown gray white yellow or green. The black mold is on the first 3 truss panels. Mold growth on attic roof sheathing is a common issue in cool climates such as the pacific northwest.

Roof leakage can often be seen as dark black stains concentrated and radiating out from one or more individual locations. When moisture condenses on plywood roof sheathing repeatedly or continuously the wood will turn black. This occurs when the temperature of the sheathing drops below the dew point creating a thin layer of moisture on the substrate. The roof has baffles at alternating thusses soffit and ridge vents.

Skips a few trusses and reappears on the next panel or two. 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. As it cools it can t hold as much moisture.