Condensation damp and mould

How condensation damp and mould occur

Condensation occurs in homes due to the steam and moisture produced through activities such as cooking, washing and drying clothes. If this damp air comes into contact with a cold surface such as your walls and windows this moisture turns back to water.

Lack of heating and ventilation can make the problem worse. Cool air can't hold much moisture so more condensation is left on your cold walls and windows, especially where air is unable to circulate easily such as behind furniture and in the corners of rooms. This is why damp and mould can be more of a problem over the winter months.

Damp conditions encourage mould growth on your walls which can ruin window frames, furniture, clothing and décor. Damp conditions are also bad for your health, particularly if you have any respiratory illnesses.

What can you do to help reduce condensation


Keeping the temperature above 15 degrees Celsius in your home will help to reduce the risk of condensation and mould growth. For this reason, try to avoid leaving unused rooms unheated. Keeping a constant temperature, rather than turning your heating on and off frequently will also help to reduce condensation as well as reducing your energy bills.


Loft and wall Insulation will help to keep the walls of your home warmer, further reducing the risk of damp. Insulating your walls has the added benefit of keeping your whole home warmer by reducing heat loss so will greatly reduce your heating bills.


Make sure to use extractor fans where possible and keep all air vents clear. Also allow space for air to circulate around furniture especially, against outside walls. Opening your windows and trickle vents will also help reduce the risk of condensation damp occurring, this is particularly important when drying clothes, cooking or bathing.

Reduce moisture

The best way to avoid condensation damp and mould is to reduce the amount of moisture created. Covering pots and pans when cooking, drying clothing outdoors instead of on the radiator, and avoiding using portable gas heaters will all minimise how much moisture you produce.