How Long Does it Take for Mildew & Mold to Form?

Mildew and mold can form one or two days after exposure to moisture, according to the Federal Emergency Management Agency. Clean up leaks, spills or floods within 24 hours to prevent mold growth.

Basics

• Mold, also called mildew, refers to microscopic organisms that decompose matter. Because mold damages possessions and causes health problems in some people, you should remove any mold in your home. If you smell a musty, earthy odor or see discoloration, your house probably has mold.

Removal

• Hire a professional service to remove mold growth that is larger than 10 square feet, according to the Environmental Protection Agency. If mold growth is smaller than 10 square feet, clean mold off nonporous surfaces with detergent and water. Allow surfaces to dry completely. Discard porous materials that have become moldy, such as ceiling tiles or cardboard.

Prevention

• If your home has too much moisture, mold will quickly grow back. Prevent mold growth by keeping indoor humidity under 60 percent and increasing ventilation with fans and open windows. Fix leaks quickly and always vent clothes dryers and stoves outside.