• Basement or crawl space.
• In, and under, carpet and rugs on cold floors.
• On window frames or below windows.
• In, and on, furniture against outside walls.
• Inside wall cavities where there is dampness or condensation.
• In damp or unventilated storage areas.
• Closets, especially ones adjacent to exterior walls.
• Around plumbing leaks.
• Near roof or wall leaks.
• Fix basement plumbing and leaks.
• Do not store porous, absorbent materials such as cardboard, newspaper, or books in the basement. Keep the floors and walls clear.
• In winter, do not turn on the humidifier unless relative humidity falls below 30 percent.
• Provide better general ventilation, and spot ventilation in damp areas.
• Insulate fresh air ducts and cold water pipes to prevent condensation.
• Use air-vapor barriers to keep wall cavities dry
• Remove carpets and rugs from cold floors, such as basements.
• Remove obstacles obstructing air flow in damp areas.
• Eliminate piles of newspapers, clothing and other materials in damp areas that can give molds a place to grow.