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A guide to condensation, damp and mould

Condensation and Mould Growth

Air in your home can in fact hold moisture - the warmer the air, the more moisture it can hold. When moist air reaches cool surfaces - such as walls, ceilings, windows, and pipes - it turns back into water (condenses) making those surfaces damp.
Most homes will be affected by condensation at some point. It is the most common cause of damp; however, it is something that can be reduced or remedied without expensive works or treatments. 

Condensation occurs due to one or more of the following:

  • Inadequate ventilation and a build-up of excessive moisture.
  • Missing or incomplete insulation resulting in cold spots.
  • Inadequate heating resulting in lower surface temperatures.

Mould will thrive with four key elements:

  • Moisture
  • Food such as wallpaper or emulsion paint
  • Right temperature
  • Oxygen

By dealing with the causes of condensation you will automatically deal with the problem of mould.

Common Household Moisture Producing Activities

Everyday activities add extra moisture to the air inside our homes. The list below gives you some idea of how much extra water you could be adding to the air in your home in a day:
 

The list below gives you some idea of how much extra water you could be adding to the air in your home in a day.
Moisture sourceAmount of water added
2 people at home (16 hours)3 pints
Person sleeping½ pint
A bath of shower2 pints
Drying clothes indoors9 pints
Cooking and use of a kettle6 pints
Washing clothes2 pints
Bottled gas heater (8 hours use)4 pints
Last modified on 28 June 2024

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