Mold can get into a building through open doorways, windows, vents, and heating and air conditioning systems. Mold in the air outside can also attach itself to clothing, shoes, bags, and pets and can be carried indoors.
Mold will grow in places that have a lot of moisture, such as around leaky roofs, windows, or pipes, or flooded areas. Mold grows well on paper products, cardboard, ceiling tiles, and wood products. Mold can also grow in dust, paints, wallpaper, insulation, drywall, carpet, and fabrics.
Indoor mold (fungus) is very common in humid areas and in homes that
have damp areas such as basements. Mold may trigger asthma symptoms, such as
wheezing or coughing, or another
allergic reaction, such as the rash of
atopic dermatitis or stuffy nose of
allergic rhinitis. Substances that trigger these
reactions are called
Although there is no strong evidence that reducing damp areas in
homes or limiting exposure to them helps reduce
asthma symptoms, taking the following steps may help keep mold out of the house or limit its growth.
Clean bathroom surfaces with soap and water, mold-killing products, or liquid bleach mixed with water. If you have mold in your home, remove it with one of these methods. Use
bleach with caution, because it may irritate your nose.
Keep the house
aired out and dry. This may be difficult in some seasons and some
Use an exhaust fan in bathrooms and the kitchen to vent
Make sure your
clothes dryer vents moist air to the outside.
Use a dehumidifier or air conditioner during humid weather. Try to
keep the humidity in the home below 50%. Molds thrive in higher
humidity. You can use a moisture or humidity meter to find out how humid it is in your home. Many hardware stores sell this device.
Seal off or avoid damp areas, such as crawl spaces, attics, or
basements. Use a dehumidifier to control mold growth in these areas. Try to
avoid materials that have been stored in these areas.
carpeting from rooms that may have a lot of moisture, such as the bathroom and
Repair any water-damaged areas from leaking roofs or
basements. Also, check the areas under sinks and around other plumbing for
leaks. These areas can be prime mold-growing areas.
Inspect closets for
items, such as shoes, that may retain moisture.
Add a mold inhibitor product to paint that you use in the home.
Store fireplace wood outside the
Adults spend one-third of their time and children spend half
of their time in their bedrooms, so it is important that you take steps to prevent
allergens in this room.
How this information was developed to help you make better health decisions.