Guidance for tenants and residents
Condensation is the most common form of unwanted dampness in buildings and occurs when warm moist air comes into contact with a cold surface.
In just one day, the average family makes about 15 pints of water vapour.
This vapour stays in the air in warm rooms but turns back into water when it touches cold surfaces such as a wall, window or ceiling.
The four main causes of condensation are:
Lack of heat
Lack of insulation
Lack of ventilation
Problems caused by condensation
The most common indication of a condensation problem is water running down windows and walls. If ignored this can lead to water collecting on the window sills, decay in window frames, stained curtains and black mould growing on walls and woodwork.
How to prevent condensation
If you find water on the inside of your windows, on cold walls and surfaces, in cold rooms or near windows it is likely to be condensation. You may also find black mould on the walls or blue/green mould on leather or wood. Mould is usually found in cold corners, cupboards or on external walls inside the property. In most cases condensation can be prevented by opening a window and making sure that all rooms within the home are heated adequately.
Keep your property well ventilated - especially when washing and drying clothes. If you have a tumble dryer, make sure the vent pipe runs outside or out a window
Open the kitchen window, close internal doors and use lids on boiling pans when cooking. Use an extractor fan if you have one
Keep bathroom windows open and the door shut when taking a bath or shower, and for a short time afterwards. Run a little cold water into the bath or basin before the hot water is turned on to reduce the amount of steam produced
Provide continuous slight ventilation by keeping window vents open at all times
Make sure that your roof space is properly ventilated.
Stop warm air hitting the windows by hanging heavy close fitting curtains
Put wardrobes and furniture against inside/internal walls. If you put them against outside walls, make sure there is a small gap between the wall and furniture for the air to circulate
Improve the insulation of your home
Dry clothes on radiators, portable bottled gas or paraffin heaters
Block up a fire place without fitting an air vent to the chimney flue
Ignore any leaks - they'll only get worse and cost more to repair
Put too many clothes in a wardrobe as this stops the air from circulating
Do not use unventilated airing cupboards for clothes - drying this way will encourage moisture build up
Please use the 'contact us' box if you have any questions. For more information, see 'related pages', 'downloads' or 'other useful websites'.
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