Black Spots On Plywood In Attic

Does mold on attic sheathing have to be removed.

Black spots on plywood in attic.

The plywood and the insulation felt dry but there were definitely a few sporatic black spots of mold. When moisture condenses on plywood roof sheathing repeatedly or continuously the wood will turn black. I have surface mold on the sheathing in my 1982 vintage 12 6 pitched attic. Last winter i took a look into the attic and noticed black stains and water marks on a portion of the sheathing material.

The presence of mold inside your home even if it. The attic is one of the parts of the home that is not frequently visited especially if it is difficult to access. In this photo of very dark mold in an attic in a wet attic mold which we found to be brown in the microscope looked black on the plywood. The house was thirty years old.

Stains on the interior walls. Mold growing on the sheathing in your attic is a serious problem that shouldn t be ignored. Are these just stains. If the dark surface of the wood smudges it could be mold.

Do i need to rip the siding and sheathing off and put a rain screen on. If the wood is soft if it s easily imprinted when you push on it it s probably rotten. Or is a little bit of mold okay if the sheathing is drying out each summer and it. It is also a potential breeding ground for black mold because it is often hot and humid and there is a potential for water seepage.

I m aware of the cause poorly vented bathroom fans and not well sealed fan fixtures lights wires etc. Do i have a minor or major problem here. Uninsulated attic hatches are a common spot where heated air escapes into an attic. The black attic mold shown here confirms that this attic had a serious venting and moisture problem including moisture from sources lower in the building.

No moisture detected and the roof is new. Black flex gas line. After a long winded background my question is. Use a flashlight and shine the beam along the surface of the osb this will reveal the mold no matter what the color due to it being three dimensional.

This summer i cleaned the portion of the black stain with a dry mop as much as i could reach from the hatch. Black mold in attics. Black marks on ceiling. The following picture is of a long standing moisture condition in an attic where much of the roof sheathing has turned black.

In old houses you ll usually see some spots that are stained dark or black where there was a roof leak at some point in time which was repaired but the stain remains. This can be caused by the action of fungal growth and molds and the affect they have on the tannins in the wood. When this seepage occurs it can often go.