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Do I still get Condensation with new windows?

There are three areas where condensation may appear on new double-glazed units

Inside the room

Between the two layers of glass

On the outside


Inside the room: –

The simple answer is condensation can still form on new double-glazed units, but with glass technologies, warm edge spacer bar and low e coatings on the inner pane, everything has been designed in the glass to limit Condensation forming. The technologies assist in making sure the inner pane stays as warm as possible to reduce the temperature falling to a dew point.

But if you have high levels of humidity in your property and don’t ventilate it well, when the temperature rapidly falls outside it will reduce the temperature of the inner pane, then when the internal warm moisture in the air comes into contact with the cooler glass it condenses and causes condensation.

Areas susceptible to this are kitchens and Bathrooms, but areas behind heavy curtains that restrict air flow may also cause condensation occurring.

Free flow Ventilation, maintaining a balanced warmth, making sure drying of clothes and plants are kept to a minimum will all assist in reducing condensation.


Between the two layers of glass

If you have condensation between the two layers of glass, it means the seal of the double-glazed unit has failed. The unit has to be replaced, check your guarantee with the installer, Boyland windows offers 10 years Guarantee on its new installed windows. If it is outside the Guarantee you will need to get a specialist to replace the glass unit. Boyland windows also offer this as a service.


Condensation on the Outside

This is a phenomenon with modern units under particular weather conditions, dew (or frost) forms on any unheated surface (the ground, roofs, walls, cars etc.) exposed to a clear night sky. In the past, this effect has not happened on the glass in heated buildings, since the heat that escapes through the glass warms the glass up slightly as it passes through. Even conventional double glazing allows sufficient heat to escape to prevent dew remaining on the external face of the glass for long.

However, insulating units incorporating low e products are assist reducing the passage of heat (i.e. it has such good thermal insulation) that in certain positions and in some weather conditions, it is more likely for the dew to form on the external face of the glass. This is one visible manifestation of having superior insulating glass. An analogy can be made with frost on roofs – those with good loft insulation can remain frosted for a long time, while those without quickly defrost.  Once the heat from the sun warms the glass or the glass is subject to air movement i.e. wind, the external condensation will start to evaporate.  It is possible to get a situation where some windows have external condensation while others nearby do not.

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