Some of the common types of mold that tend to grow in homes include Cladosporium, Penicillium, Aspergillus and Alternaria. Stachybotrys chartarum (also known as Stachybotrys atra), which is a greenish-black mold, is a less common to find in homes, but it is not rare.
Mold spores are present both indoors and outdoors, and they can easily be transferred from one place to another. If they are present in an area that has excessive moisture, they begin to grow. Excessive moisture in homes often results from high humidity, water leaks, condensation, water infiltration and floods. Installing a dehumidifier or an air conditioner in the home reduces the moisture level during the warmer months and helps prevent mold.
Every home has at least some mold. When mold becomes a problem, it is usually possible to see or smell it. Large amounts of mold are more commonly found in the bathroom, the basement, the laundry room, the kitchen and the attic. Mold often grows on the underside of carpets and in the drywall; mold is harder to detect in drywall, because it is largely unseen. The type of mold does not make much of a difference, as all types of household mold can be removed using the same methods.