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How To Prevent Mould

What can I do to prevent mould contamination?


Moulds can grow almost everywhere and on any substance providing moisture is present. Thus, the best method of prevention is to reduce the amount of moisture.

Keep the relative humidity between 30% and 50%. To accomplish this goal, prevention measures include:

  • Vent showers and other moisture generating sources directly to the outside.
  • Control humidity with air conditioners and/or dehumidifiers*.
  • Use exhaust fans when cooking, dishwashing, or laundering (especially in the food service or laundry areas) or when cleaning large areas.
  • Insulate cold surfaces to prevent condensation on piping, windows, exterior walls, roofs and floors where possible.
  • Keep the building and the heating, ventilation and air conditioning (HVAC) systems in good repair.
  • Clean up any floods or spills immediately (within 24-48 hours). See cleaning up Mould section for more information on cleaning, etc.
  • For floors and carpets, remove spots or stains immediately. Reduce the amount of water used when cleaning carpets as much as possible.
  • Do not install carpet around fountains, sinks, bathtubs/showers or directly on top of concrete floors that are prone to leaks or frequent condensation.

* It is important to remember that when using air conditioners and dehumidifiers to keep them in good condition. Empty any water collectors regularly so this water does not contribute to the moisture problem! If you use humidifiers, ensure that they are cleaned regularly.