Dark Plywood In Attic

After several years of this there may be.

Dark plywood in attic.

Mold spores penetrate the plywood in your attic and it is difficult to completely eradicate it. In many cases the continued wetting of the sheathing will cause it to rot but that may take several years or decades depending on the attic ventilation. While the plywood. When moisture condenses on plywood roof sheathing repeatedly or continuously the wood will turn 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 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. If the dark surface of the wood smudges it could be mold. There is also a small risk that comes with applying the mold protective sealant in that the sealant can trap moisture in the plywood which will cause it to decompose and decay.

If your attic joists won t bear the weight necessary to finish out a living space but the engineer cleared them to support floor decking for light storage you can install inch plywood or. This can be caused by the action of fungal growth and molds and the affect they have on the tannins in the wood. Below is an image of heavy 3 dimensional mold growth on the sheathing. The following picture is of a long standing moisture condition in an attic where much of the roof sheathing has turned black.

The dark discoloration will remain long after the mold has stopped growing. 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. If the wood is soft if it s easily imprinted when you push on it it s probably rotten. The other two possibilities for the stains.

Black mold in attics.