Dark Plywood In Attic

In a reasonably well insulated and vented attic stains may appear due to condensation.

Dark plywood in attic.

Beneath the fuzzy growth areas of staining can be observed as well. You discovered dark staining on your attic sheathing and think it may be mold now what. They must span at least three joists for stability. 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.

I have surface mold on the sheathing in my 1982 vintage 12 6 pitched attic. While the plywood. I m aware of the cause poorly vented bathroom fans and not well sealed fan fixtures lights wires etc. Attic stains may fall into this category depending on the severity.

This can be caused by the action of fungal growth and molds and the affect they have on the tannins in the wood. 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. When moisture condenses on plywood roof sheathing repeatedly or continuously the wood will turn black. Black mold in attics.

John i know what you are saying and i see the same black fuzzy mold often as well. Below is an image of heavy 3 dimensional mold growth on the sheathing. The presence of mold in your attic is often the result of poor ventilation insufficient insulation moisture. Mold on the underside of roof sheathing is also very common.

07 10 2009 09 24 pm 7. Learn the real causes of mold growth on attic roof sheathing and what you can do to remove it for good. Attic spaces are one of the most common places in a home for mold to be found growing. Attic moisture and poor ventilation are the causes.

Preserve the attic s airflow. The new roof doesn t help much most of the moist air is likely coming up from below. The dark discoloration will remain long after the mold has stopped growing. Black stains in attic.

But this appeared to be absorbed into the decking. Illuminate dark corners of the attic using portable battery operated lanterns or clip on workshop lights. 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. If the wood is soft if it s easily imprinted when you push on it it s probably rotten.

Plywood comes in 4 by 8 foot sheets with thicknesses ranging from 1 4 to 1 1 4 inches. The following picture is of a long standing moisture condition in an attic where much of the roof sheathing has turned black. Mathew stouffer guest re. The thickness that builders use most often for subfloors is 3 4 inch and when they need extra reinforcement.