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Condensation and mould

There is always some moisture in the air even if you cannot see it. As the air gets cooler it can hold less moisture so droplets of water appear, especially on cold surfaces. This is known as condensation. Everyday examples of condensation are when you see your breath in cold weather or when the mirror mists up when you have a bath.

Dealing with and preventing condensation

Some normal daily living activities produce a great amount of water vapour which can cause condensation around the home. You can help to prevent condensation from occurring by:

  • Maintaining a low level of heating throughout your home where possible
  • Using a tumble dryer which is self-condensing or vented externally
  • Avoiding drying clothes indoors/over radiators
  • Covering pans when cooking to reduce steam
  • Opening windows and ensuring the trickle vents in window frames are left open
  • Leaving the isolator switches on for the kitchen and bathroom ventilator systems

Condensation is more apparent in winter, as the external air temperature is low and walls and windows are cold. If you find condensation forms on your windows during the winter months, try to wipe it away with a cloth each morning to prevent mould forming. Make sure you wring the cloth into a sink rather than letting it dry on a radiator, which can also increase the amount of condensation formed. 


The development of mould growth is frequently associated with condensation. It can lead to staining, damage to wallpaper, window frames, furniture and clothing. The only way to avoid severe mould is to stop the cause - condensation.

Dealing with mould affected areas

  • Strip wall and ceiling paper from mould affected rooms
  • Wash down mould affected walls, ceiling and paintwork with a fungicidal wash
  • Dry clean mould affected clothing. Shampoo carpets and other soft furnishing affected by mould with a suitable cleaning product.