Mold spores are present everywhere. Mold growth is most prolific in warm, damp weather, but high indoor moisture levels and poor ventilation can contribute to mold growth any time of year. To help reduce the potential for mold, provide adequate air circulation and reduce moisture levels in mold-prone areas, such as basements and storage areas.

Avoid storing items directly against walls in potentially damp areas, which restrict air circulation and trap moisture against surfaces. Also consider placing boxes and storage containers on blocks or pallets to allow for air flow.


If you’re going away for an extended period of time, remember that a closed-up house usually creates an environment where air changes occur very slowly. Any water vapor present can condense on the cooler surfaces and allow mold to grow as the temperature warms up.

Frequent air change will help control moisture levels and keep moisture and mold spores from building up. When outdoor weather is appropriate, promote air flow and air changes by using air circulating fans and/or opening the windows slightly. Dehumidifiers can help remove moisture from the air, but realize mold spores will remain. Problems may re-occur when moist conditions return.

Since prevention is always the best way to keep a home fit, the following tips can avoid the potential health and financial burdens associated with mold. For additional guidance on mold issues, visit the Canada Housing and Mortgage Corporation or the U.S. Environmental Protection Agency.

Quick Tips:

  • Avoid resting long-term storage directly against walls.
  • Place storage boxes on pallets.
  • Keep basement windows slightly open during mild, dry weather.
  • Maintain air circulation in all areas, particularly basements and storage areas.
  • Filter fresh air changes to help keep spores from building up.

Remember, these tips are only general guidelines. Since each situation is different, contact a professional if you have questions about a specific issue.


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