Condensation occurs naturally on windows, whether double or single glazed, whenever moist, warm air, encounters a cold surface.

Windows are generally less well insulated than walls, causing them and their surrounds to be the coolest surfaces in the room, hence condensation is most common during the coolest, dampest months of the year.

Convection currents are a major culprit and by controlling the production of excessive moisture, you can reduce the condensation you experience. One thing you should never do is draught exclude existing windows – this creates a condensation trap.

Where condensation is a major issue, we often specify secondary glazing with balanced trickle ventilation. This provides a simple, cost-effective, and permanent solution.

How best to control condensation

The key factors for dealing with general condensation are humidity & moisture control plus the need for ventilation.