Top pointers on Decreasing Condensation

Lower condensation by getting rid of excess moisture through ventilation. This can be done without making draughts or causing spaces to become cold.

Is your home a Condensation Trap?

Modern structures are created to get rid of draughts and do not have the natural ventilation that some older houses have with their chimneys and uncomfortable windows and doors.

As a result, houses that have been completely sealed by the setup of cavity wall insulation, loft insulation, double or triple glazing, and draught proofing can frequently become moisture traps.

In such cases, condensation can normally be seen as a ventilation problem. Offered the spaces are heated properly, a service will probably be discovered in the provision of reliable ventilation.

By opening windows or aerating your home it may appear that you are losing some heat. What you are actually doing is permitting warm moisture-laden air to escape and allowing cool dry air to enter your home. Dry cool air is cheaper to heat than warm damp air.

Room-specific tips for minimising condensation


  • Stop water vapour finding its way into the remainder of the house, especially throughout and after bathing.
  • After a bath or shower, close the door and open a window for a couple of minutes. Position the radiator, or heated towel rail, under the window.
  • Consider installing an extractor fan.


  • Guarantee curtains are at least 15cm to 20cm far from window glass to allow free motion of warm air.
  • Where open fires are not provided, or existing flues are blocked off, see that wall vents are fitted and kept clear.
  • If possible extend the central heating programme to compensate for the night-time drop in external temperature level, and the increase in water vapour triggered by the residents’ breathing.
  • Bed room windows need to be opened throughout the day to allow at least one complete air modification.

Kitchen areas and laundries

  • Close internal doors and keep a window open. Alternatively, set up extractor fans or cooker hoods ventilated to the outside air.

Living rooms

  • Allow the room’s heat to reach the windows. Position heating systems under the windows and location curtains at least 15cm to 20cm away from the glass to permit free motion of warm air.
  • Open windows for at least a few minutes every day to allow air modifications.
  • Where open fires are not provided, or existing flues are blocked off, see that wall vents are fitted and kept clear. When a gas fire has actually been set up in an open fire aperture, the back plate should have vent holes listed below the fire, unless offered in the design.
  • Where possible, avoid glazed or non-absorbent wall covering, as this can promote condensation on walls.


  • Think about crossflow ventilation with using vents in walls and roofings particularly if the conservatory is south facing.
  • Drip ventilation in the wall, eaves and ridge zone can also help.

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