Black Spots On Plywood In Attic

Based on the reading i ve done on this site i have learned that the double stud wall system can cause condensation problems on the inside of the plywood sheathing.

Black spots on plywood in attic.

In the attic the most common places to find black mold are the places where water is likely to be a problem. Frost can also form on plywood in certain cases. The variety i see most often is fuzzy green when active and goes black like that when dormant or dead. Black mold in attics.

If the dark surface of the wood smudges it could be mold. 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. Last winter i took a look into the attic and noticed black stains and water marks. If the wood is soft if it s easily imprinted when you push on it it s probably rotten.

It s probably just darkness that comes from the wood being repeatedly wetted and dried from frost forming melting and drying. Black stains in attic. Without proper ventilation in the attic high heat and humidity can build up which leads to moisture from a different source. Pics inside its definitely microbial growth.

Uninsulated attic hatches are a common spot where heated air escapes into an attic. If the wood is solid it s probably fine. I did some investigating this august and sure enough i noticed a few black mold spots on the inside of the plywood. After several years of this there may be.

The new roof doesn t help much most of the moist air is likely coming up from below. You have something growing on the surface of the wood caused by excess moisture. That is a stain caused by mold mould. 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.

Call it microbial mildew or mold it really doesn t matter. Nails collect frost when the weather conditions and rh are right. Attic moisture and poor ventilation are the causes. Walls that are improperly insulated may develop mold because they will absorb moisture from outside.

Mold usually causes a musty odor and may cause staining that may be black brown gray white yellow or green.