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Mould can cause allergic reactions

Mould can trigger asthma attacks

Increases susceptibility to colds & flu

Mould can cause sinus infections
What is Condensation?
  • Condensation usually occurs where moist warm air comes into contact with a colder surface.
  • Condensation is more noticeable where it forms on hard surfaces such as windows, window sills, mirrors or tiles.
  • Condensation can form on any surface, but it may not be noticed until mould growth is apparent or until some materials rot away.
  • The air can contain water vapour in various quantities and its capacity to do this depends on its temperature – the warmer the air the more moisture is held.
  • When this moist air comes into contact with either colder air or a colder surface, the air is unable to retain the same amount of moisture and the water is released to form condensation on the surfaces it comes into contact with.

Conditions for Condensation

As Energy Conservation is required more these days and all the natural ventilation has been greatly reduced. With the introduction of double glazing, central heating and more efficient draught proofing houses have become effectively sealed boxes, keeping in any moisture produced within the house and providing ideal conditions for condensation to occur. Ventilation is only effective if it is throughout the whole of the property.

Condensation is assisted by poor air circulation, places where air movement behind furniture and in cupboards is restricted this allows moist air to gather. The first evidence of this is often the appearance of mould and sometimes with a musty smell on clothes in wardrobes. The warm, moist air rises from kitchens to the bedrooms, wardrobes and upstairs bathrooms and toilets. In bathrooms and kitchens the air contains a lot of moisture; if that air then spreads to cooler parts of the house it condenses on any colder surface.

Tumble dryers are a major source of moisture within a property unless they are vented externally or a condensating type of Dryer which collects the water and has to be emptied away.


Look for structural defects first:
  • Missing or bridged Damp Proof Course (DPC)
  • Damaged gutters or down spout pipes
  • Porous pointing or brickwork
  • Leaking roofs
  • Inadequate ventilation
  • UPVC windows with no trickle vents
  • Leaking pipes either waste pipes, water pipes or radiators