Molds produce tiny spores to reproduce. When mold spores land on damp spot indoors, they begin growing and digesting whatever they are growing on to survive. There are molds that can grow on wood, paper, carpet, and foods. Mold growth occurs when excessive moisture or water accumulates indoors, particularly if the moisture problem remains unaddressed. There is no practical way to eliminate all mold and mold spores in the indoor environment; the way to control indoor mold growth is to control moisture.
Mold can grow almost anywhere in a property if conditions permit. If there is visible growth on painted wall surfaces, then homeowners should be concerned about what may be growing on the opposite side of the wall. If the wall remains wet for a prolonged period, then mold growth on the backside will be worse than on the front. As such, contain the workspace and remove moldy materials, followed by cleaning of salvageable framing are the best options.