Prevent Mould Growth from Window Condensation This Winter

Winter brings cold temperatures, and with it comes the risk of condensation forming on your windows. While this may seem like a minor inconvenience, persistent condensation can lead to mould growth, which poses health risks and can damage your home. Fortunately, there are several steps you can take to prevent excess moisture buildup and keep mould at bay.

Why Does Condensation Form on Windows?

Condensation occurs when warm, humid indoor air meets the cold surface of your windows. The temperature difference causes moisture in the air to turn into water droplets on the glass. If left unchecked, this moisture can seep into window frames, sills, and surrounding walls, creating the perfect environment for mould to grow.

Steps to Prevent Condensation and Mould Growth

  1. Improve Ventilation

Proper air circulation can help reduce indoor humidity levels and prevent condensation from forming. Try these methods:

  • Open windows for a few minutes each day to allow fresh air in.
  • Use exhaust fans in kitchens and bathrooms when cooking or showering.
  • Keep interior doors open to promote airflow between rooms.
  1. Control Indoor Humidity

High humidity levels inside your home contribute to condensation and mould growth. Aim to keep indoor humidity between 30-50% by:

  • Using a dehumidifier in high-moisture areas.
  • Running your HVAC system or furnace fan to help distribute air evenly.
  • Avoiding drying clothes indoors or ensuring proper ventilation if you do.
  1. Use Weather Stripping and Insulation

Cold air seeping through window frames can increase condensation. Reduce heat loss by:

  • Sealing gaps around windows with weather stripping or caulking.
  • Using insulated curtains or thermal blinds to keep indoor temperatures stable.
  • Installing double- or triple-pane windows for better insulation.
  1. Wipe Away Condensation Promptly

If you notice condensation forming, act quickly to remove it before it leads to mould growth:

  • Use a dry cloth or squeegee to wipe down windows and frames each morning.
  • Place moisture-absorbing materials like silica gel or desiccant bags near windows.
  1. Rearrange Furniture and Window Coverings

Airflow restrictions around windows can lead to trapped moisture. To improve air circulation:

  • Keep furniture at least a few inches away from exterior walls and windows.
  • Open blinds and curtains during the day to allow airflow and natural light to dry out moisture.

What to Do If Mould Has Already Formed?

If you spot mould around your windows, take immediate action to prevent it from spreading:

  • Clean small patches with a mixture of water and vinegar or a commercial mould remover.
  • Dry the area thoroughly and improve ventilation to stop recurrence.
  • If mould covers a large area or has penetrated walls, consider hiring a professional mould remediation service.

Final Thoughts

Condensation on windows is a common winter issue, but with proactive steps, you can minimize moisture buildup and prevent mould from taking hold in your home. By improving ventilation, controlling humidity, and keeping surfaces dry, you can create a healthier indoor environment and protect your home from mould-related damage.

Need expert help with mould concerns? Contact IES Consulting for professional mould assessments and solutions to keep your home safe.

 

author avatar
Chris Croft Technical Lead


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