Black Spots On Plywood In Attic

I m aware of the cause poorly vented bathroom fans and not well sealed fan fixtures lights wires etc.

Black spots on plywood in attic.

This can be caused by the action of fungal growth and molds and the affect they have on the tannins in the wood. Mold is not always easy to see most of the time it is of a different color than the material it is on but if you have painted the osb a dark color it may be difficult to spot. If the dark surface of the wood smudges it could be mold. No moisture detected and the roof is new.

The house was thirty years old. This summer i cleaned the portion of the black stain with a dry mop as much as i could reach from the hatch. After a long winded background my question is. The attic is one of the parts of the home that is not frequently visited especially if it is difficult to access.

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. This was on the under side of the roof decking. When moisture condenses on plywood roof sheathing repeatedly or continuously the wood will turn black. 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.

Black mold in attics. 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 following picture is of a long standing moisture condition in an attic where much of the roof sheathing has turned black. When this seepage occurs it can often go.

Mold growing on the sheathing in your attic is a serious problem that shouldn t be ignored. Do i have a minor or major problem here. Uninsulated attic hatches are a common spot where heated air escapes into an attic. The plywood and the insulation felt dry but there were definitely a few sporatic black spots of mold.

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. Are these just stains. The presence of mold inside your home even if it. Does mold on attic sheathing have to be removed.

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. Black marks on ceiling. Last winter i took a look into the attic and noticed black stains and water marks on a portion of the sheathing material.

Stains on the interior walls. There did not appear to be any mold or mildew on the surface but i could see black spots. Black flex gas line.