Effects of condensation
Black Mould growth is often the first visible sign of condensation, usually present on decorative surfaces such as wallpaper. The mould and its spores also cause a musty odour and often give rise to respiratory health problems. When condensation occurs in roof spaces or sub floor areas, timbers in those areas can become damp and susceptible to dry or wet rot.
Condensation is more common in the colder months when water vapour levels are higher. It should also be noted that sometimes the problem can occur away from the site of water vapour production. For example water vapour produced in a bathroom or kitchen may diffuse through the house and condense on the walls of a cold bedroom.
It should be noted that Black Mould can only flourish on the pure water associated with condensation – therefore it is not an indication of rising damp.
1. Improve Ventilation
Ventilation can be achieved by a variety of measures including simply opening the windows, however the most effective method to control local condensation problems is the installation of a powered extractor fan. However, where the condensation is a widespread problem, a more successful approach would be the installation of a positive pressure system. This will draw air in to the roof space, gently push it down in to the property, and cause moisture laden air to be continually pushed out.
2. Apply Heat
A constant low level background heat will gradually warm wall surfaces and reduce the risk of condensation.
Other Useful Measures
A strategically placed dehumidifier, to lower the water content of the air, can be very effective.
2. Surface cleansers and anti-mould paints
Surface cleansers or anti-mould washes are an effective short term measure to remove Black Mould from walls and other surfaces.
Anti-mould paints are particularly useful in kitchens and bathrooms or other areas where condensation is often difficult to control and where there is a high risk of mould growth. They must not be decorated over and will remain effective for many years.
3. General advice
When cooking, washing, bathing or drying clothes, keep the door closed and the window open. This will prevent warm, moist air moving to colder areas of the building.