Blackened Roof Sheathing

Mold can form but often it.

Blackened roof sheathing.

Mold on the underside of roof sheathing is also very common. Also a heavy layer of snow on the surface of the roof will insulate the sheathing and may keep the frost from melting altogether. Ive spent hours staring at a single picture. Mold growing on the sheathing in your attic is a serious problem that shouldn t be ignored.

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. Small stains may only be this surface moisture bleeding out minerals or dirt from the wood and are often brownish in colour. The presence of mold inside your home even if it. 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.

If the frost does melt it will further wet the wood in the attic staining it. At this time the ventilation should be entirely removed and insulation installed directly on to the roof sheathing. Jim katen oregon. When the roof sheathing is rotted or damaged or when other structural repairs are needed a tear off is unavoidable.

The following picture is of a long standing moisture condition in an attic where much of the roof sheathing has turned black. When moisture condenses on plywood roof sheathing repeatedly or continuously the wood will turn black. This can be caused by the action of fungal growth and molds and the affect they have on the tannins in the wood. The old cameras while hopelessly crude compared to modern cameras had enormous negatives that showed tremendous detail.

When attic surfaces or insulation contain a large reservoir of toxic or allergenic mold and if the area were inaccessible say because the space is too small to enter then it may be necessary to remove some portion of roofing. Treating and venting the flat roof section would be impossible due to the limited access. Does mold on attic sheathing have to be removed. Therefore our recommendation was to focus on lowering the interior humidity levels and wait until the roof is due for replacement.