Why do I get condensation on the inside of my double-glazed windows?

double glazed windows
With 1 in 5 UK households suffering from some form of domestic condensation issue, we thought it time to address some commonly asked questions on the subject;

Why does condensation form on the inside of my double glazing?

If condensation is forming inside the gap between your double-glazed windows, it is more than likely that the sealant around the double glazing has failed.

How do I get the moisture out of my double glazing?

When moisture breaches the double-glazed seal and condenses between the layers of glass, it is time to remove the units and replace them. The longer you leave the failed units, not only will this impede your view of the outside world, but it will also make your home considerably more vulnerable to heat loss and energy inefficiency. Failed double glazed units could also seriously affect your EPC rating, making your home less ‘sellable’ too.

Should double glazing get condensation on the inside?

There are different forms of condensation, but internal condensation developing on the inside of double glazing is due to excess moisture in the atmosphere coming into contact with the low temperature of the glass. Condensation forms on the inside of the double glazing because the temperature of the hard surface is below the dew point temperature of the air coming into contact with it, so water condenses on the surface.

Condensation on double glazing window

How can I reduce condensation forming on double glazing internally?

You need to reduce the excess moisture in the atmosphere by ventilating the affected rooms, which will effectively disperse the moisture bearing air to the outside.

Condensation reducing ventilation checklist

• Slightly open windows/trickle vents throughout the day for a change of air.
• Make sure air bricks/wall vents are open and kept clear.
• Draught proof internal doors to prevent rooms that have high water vapour contents from drifting throughout the house, e.g. bathrooms and kitchens.
• Throughout cold spells, keep some form of heating on permanently inside; ideally via radiators positioned under double glazed windows.
• Create a free passage of warm air to the glass by positioning heavy curtains 15-20cm away from the double glazing, leaving sufficient gaps at the top and bottom of the curtains to enable a continuous flow of air.

You should now understand that internal condensation is not caused by double glazing, it is because of inadequate ventilation and/or heating within your South Wales home.

A rated double glazing from South Wales home improvement experts

Enhance your homes energy efficiency by utilizing high-quality double glazing. Contact us today for further information and advice on how to make your home thermally efficient this winter.

Related to this topic: 10 home improvement ideas for the new year

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