Condensation describes the transition of a vapour or gas into a liquid aggregate state. This can be a particular problem in residential houses. A normal household produces several litres of water vapour over the course of a day. This water vapour condenses on cold surfaces, such as walls and windows, unless rooms are properly ventilated.
Ventilating rooms, however, can prove difficult, especially in bathrooms and kitchens. If it is not possible to adhere to a correct ventilation regime, condensation in houses can lead to mould growth, as well as other condensation problems.
Problems with condensation commonly arise due to condensation providing an ideal environment for mould growth. This can result in blackened window frames, damp patches and mould growth on walls. Other signs of condensation problems in houses are mould growth on fabrics, such as clothing and soft furnishings, as well as streaming windows.
To reduce the risk of mould growth and other condensation problems caused by condensation, buildings should be thoroughly ventilated on a daily basis. Ideally houses should be fully ventilated three times a day, to ensure a regular air exchange. During these ventilation periods radiators should be turned down to avoid unnecessary energy wastage. A good air exchange means, that the air inside the house, which generally contains a lot of water vapour, is exchanged with colder, dryer air.