Many building materials provide suitable nutrients that encourage mold to grow. When mold spores drop on places where there is excessive moisture, such as where leakage may have occurred in roofs, pipes, walls, plant pots, or where there has been flooding, they will grow. Mold in the air outside can also attach itself to clothing, shoes, and pets can and be carried indoors. Mold can enter your home through open doorways, windows, vents, and heating and air conditioning systems. How do molds get in the indoor environment and how do they grow? We do not have precise information about how often different molds are found in buildings and homes. The most common indoor molds are Cladosporium, Penicillium, and Aspergillus. Mold can also grow in dust, paints, wallpaper, insulation, drywall, carpet, fabric, and upholstery. Mold grows well on paper products, cardboard, ceiling tiles, and wood products. Mold will grow in places with a lot of moisture, such as around leaks in roofs, windows, or pipes, or where there has been flooding.

Molds are very common in buildings and homes.

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