Black Spots On Plywood In Attic

If the dark surface of the wood smudges it could be mold.

Black spots on plywood in attic. If the wood is solid it s probably fine. Last winter i took a look into the attic and noticed black stains and water marks. Black stains in attic. Pics inside its definitely microbial growth.

It s probably just darkness that comes from the wood being repeatedly wetted and dried from frost forming melting and drying. Frost can also form on plywood in certain cases. Mold usually causes a musty odor and may cause staining that may be black brown gray white yellow or green. The variety i see most often is fuzzy green when active and goes black like that when dormant or dead.

When the attic has been damp or wet there might be a more serious problem with aspergillus sp. If the wood is soft if it s easily imprinted when you push on it it s probably rotten. After several years of this there may be. 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.

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. The mold itself may have a cottony texture but can also be velvety leathery or. Nails collect frost when the weather conditions and rh are right. The new roof doesn t help much most of the moist air is likely coming up from below.

Without proper ventilation in the attic high heat and humidity can build up which leads to moisture from a different source. In the attic the most common places to find black mold are the places where water is likely to be a problem. 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. You have something growing on the surface of the wood caused by excess moisture.

Call it microbial mildew or mold it really doesn t matter. That is a stain caused by mold mould. I did some investigating this august and sure enough i noticed a few black mold spots on the inside of the plywood. Walls that are improperly insulated may develop mold because they will absorb moisture from outside.

Black mold in attics.