Why and when condensation occurs
Condensation is most common in the winter months because as the weather deteriorates and becomes colder, so too does the external wall temperature. When met with the warmth of your cosy home, this can cause the moist air to condense to the coldest surface. Condensation never occurs for one reason; there are always three or four contributing factors. These include poor ventilation, heating variations, occupancy changes, cold bridging, and also, whether the house faces North, East, South or West and the type of walls that is solid brickwork or cavity construction. When diagnosing why condensation is occurring, all these factors must be considered.
Condensation is easily recognisable by water droplets on windows or walls. Furthermore, an unusual and sometimes unpleasant smell is also a sign of condensation as is unsightly black mould, which is a common indication that condensation is occurring.