Black Spots On Plywood In Attic

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.

Black spots on plywood in attic.

Call it microbial mildew or mold it really doesn t matter. The variety i see most often is fuzzy green when active and goes black like that when dormant or dead. Last winter i took a look into the attic and noticed black stains and water marks. That is a stain caused by mold mould.

Nails collect frost when the weather conditions and rh are right. In the attic the most common places to find black mold are the places where water is likely to be a problem. Black mold in attics. 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.

Frost can also form on plywood in certain cases. Walls that are improperly insulated may develop mold because they will absorb moisture from outside. If the wood is solid it s probably fine. If the dark surface of the wood smudges it could be mold.

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. When the attic has been damp or wet there might be a more serious problem with aspergillus sp. The mold itself may have a cottony texture but can also be velvety leathery or. I did some investigating this august and sure enough i noticed a few black mold spots on the inside of the plywood.

Uninsulated attic hatches are a common spot where heated air escapes into an attic. You have something growing on the surface of the wood caused by excess moisture. Black stains in attic. After several years of this there may be.

Mold usually causes a musty odor and may cause staining that may be black brown gray white yellow or green. Attic moisture and poor ventilation are the causes. It s probably just darkness that comes from the wood being repeatedly wetted and dried from frost forming melting and drying. If the wood is soft if it s easily imprinted when you push on it it s probably rotten.

Pics inside its definitely microbial growth.