Tenants Handbook

VENTILATING YOUR HOME

Condensation in housing

Condensation is probably the main cause of dampness and mould growth in dwellings. As a result of continuing condensation walls, ceilings and sometimes floors become damp,discoloured and unpleasant due to mould growing on their surfaces. The following notes explain how condensation occurs and what YOU can do to prevent or cure serious outbreaks of it in your home. Why Condensation Occurs Condensation occurs when warm moist air meets a cold surface. The likelihood of condensation therefore depends on how moist the air and how cold the surfaces on the room are. The moistness of the air the coldness of the surfaces depend on a range of factors, many of which are determined by the way the house is used. When Condensation Occurs Condensation usually occurs in winter. This is because the building surfaces are cold, more moisture is generated within the house and, because windows are opened less, the moist air cannot escape. Where Condensation Occurs Condensation, which you can see, occurs for short periods in bathrooms and kitchens because of the steamy atmosphere. It also occurs for long periods in unheated bedrooms and sometimes in wardrobes, cupboards or corners of rooms where ventilation and air movement is restricted. Condensation can also occur on materials which are out of sight, for example in roofs.

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