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Condensation Problems

Condensation is a process where warm, moist air comes into contact with cooler air currents, which is at a lower temperature, as this air progressively cools, it reaches the ‘dew point’ causing a rapid change of the moisture from a gaseous to liquid state, resulting in condensation. This is a natural process as part of the water cycle, including evaporation, condensation and precipitation.

There are a number of sources of condensation within the home, however the primary ones are the cooker, unvented dryer, kettle, hot taps to use of the bath/ shower and drying of clothes on radiators (not recommended practice).

A number of properties, built in the 1980/90s were built with high thermal retention in mind, aligned to the current environmental agenda of the time. However, a poor side effect was the effects of condensation, due to inadequate ventilation to remove warm, moist laden air in the home.

It is recommended that the following be provided to counter/ mitigate the likelihood and effects of condensation problems, these include:

  • Ensure there is an extractor fan (axial fan or similar) present in the Bathroom, activated on a timer or pull cord switch.
  • Cooker extractor hood is present, on and working adequately, with reminders to make use of this during cooking time.
  • Avoid drying clothes in the home on radiators, and or ensure a dryer is vented to outside, which produces large amount of excess moisture.
  • Install trickle ventilators- suitable to UPVC double glazed windows, allows slight supply of fresh air into the premises.
  • Install heat exchange units, such as RAC (Run around Coil) systems, which heats incoming air with the warmed outgoing extract air
  • Open windows, patio doors etc to allow purge ventilation
  • Reduce interim heating routines; by setting the thermostat at a constant will ensure the home is heated to a minimum temperature throughout the day; thus avoid stark temperature gradients.
  • Insulate the home, particularly avoiding gaps around window jambs, lintels, door openings will restrict the possibility of ‘cold bridging’ occurring.

The average home should have a certain, predefined air circulation rate of approximately 60litres/ second or 1-2 air change per hour.

Reducing the presence of condensation by introduction of fresh air into the ventilation system will further benefit the occupants by reducing the build up of toxins, pathogens and fibrous particles in the air. It should be borne in mind however not to focus too much on mechanical ventilation methods, otherwise SBS (Sick Building Syndrome) may be encountered, although this is predominately a problem in offices.

If condensation problems are not rectified immediately, they may lead to progressive mould growths, damaged/ deteriorating internal decorations and plaster. Such moulds may produce spores, a few of which have adverse health effects and can lead to allergies, asthma and severe irritations.