What makes molds grow in a building?

Mold is in the atmosphere all around us as tiny spores. The spores need moisture to begin growing, digesting and destroying. Molds can grow on almost any surface, including; wood, ceiling tiles, wallpaper, paints, carpet, sheet rock, and insulation. The mold grows best when there is lots of moisture from a leaky roof, high humidity, or flood. There is no way to get rid of all mold spores from a building, because they are naturally occurring in the environment. Mold is controlled by keeping organic building materials dry.