Condensation accounts for approximately 70% of reported damp problems in domestic dwellings. It can also be a contributory factor of infestation by wood boring insects and outbreaks of fungal decay.
Condensation can commonly be attributed to a lack of balance between heating and ventilation, resulting in a rise in relative humidity.
Air can hold more water vapour when warm than when cold. When warm air is cooled, such as when the heating is switched off at night, it will deposit the water that it can no longer retain as condensation on a cold surface. A similar effect can be demonstrated by breathing onto a mirror or other cool surfaces.
An average family of 4 people can produce up to 16 pints of water vapour a day! This can come from drying wet clothes on radiators, using a tumble dryer, having showers & baths, cooking and of course breathing.