Black Spots On Plywood In Attic

The variety i see most often is fuzzy green when active and goes black like that when dormant or dead.

Black spots on plywood in attic. Pics inside its definitely microbial growth. After several years of this there may be. 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. In the attic the most common places to find black mold are the places where water is likely to be a problem.

Walls that are improperly insulated may develop mold because they will absorb moisture from outside. Without proper ventilation in the attic high heat and humidity can build up which leads to moisture from a different source. Uninsulated attic hatches are a common spot where heated air escapes into an attic. Attic moisture and poor ventilation are the causes.

You have something growing on the surface of the wood caused by excess moisture. Nails collect frost when the weather conditions and rh are right. Frost can also form on plywood in certain cases. If the dark surface of the wood smudges it could be mold.

It s probably just darkness that comes from the wood being repeatedly wetted and dried from frost forming melting and drying. 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. That is a stain caused by mold mould. If the wood is soft if it s easily imprinted when you push on it it s probably rotten.

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. The mold itself may have a cottony texture but can also be velvety leathery or. The new roof doesn t help much most of the moist air is likely coming up from below. Call it microbial mildew or mold it really doesn t matter.

I did some investigating this august and sure enough i noticed a few black mold spots on the inside of the plywood. Last winter i took a look into the attic and noticed black stains and water marks. Mold usually causes a musty odor and may cause staining that may be black brown gray white yellow or green. Black mold in attics.

Black stains in attic.