Mold

Mold requires the following conditions to grow:

• Mold spores (which are always present indoors and outdoors)
• The right temperature range, from 2°C to 40°C
• A food supply, which means anything organic such as books, carpets, clothing, wood, drywall, etc.
• A source of moisture

The last condition, moisture, is the only practical factor to control in most houses.