Condensation on Double Glazing

At The London Glazing Group, we provide the very latest in energy efficient windows and doors in aluminium and PVCu.

Our complete range of windows and doors is designed with the latest in window technology. Our PVCu windows feature multi-chamber profiles, our aluminium ranges with sophisticated ‘thermal breaks’ from a polyamide material. Both types of frame design provide insulation for the window and prevent cold from the outside transferring to the inside.

Another feature of our energy saving windows is the glass we use. This is latest technology double glazed units with argon gas fill, warm edge spacer bars and specialist coatings. Modern windows are highly thermally efficient, and at times you may see condensation on the outside of your windows. What is external condensation on your windows and why is it happening?

What causes condensation on d?o

New house with energy efficient windows.

Modern windows are superbly energy efficient, keeping heat in the home. External condensation is normal.

If you are surprised to see external condensation on your windows and doors, we can reassure you this is normal. It is natural to assume that there is somehow a fault with your new windows. External condensation will be more obvious during the Autumn and the Winter.

Condensation on the outside of your windows is simply your windows performing as they should in keeping heat in your home and cold on the outside. But it is helpful to explain a little why this is happening.

Condensation on new bifolding doors or windows

Condensation forms on “cold spots” found everywhere in the home. On older windows and windows with single glass, this was typically on the inside because the heat was escaping and the cold was coming in.

Because your windows and door are now so thermally efficient, these cold spots are remaining on the outside of the window. The heat in the home is retained instead of passing through the inefficient window or glass. Another explanation is that the outside pane of your window is colder than the glass or window it previously replaced.

An even simpler explanation is your frozen windscreen on a very cold morning. Your car heater is heating up the glass, the heat is passing through the glass melting the frost or ice on your windscreen. With an energy efficient window, the heat does not pass through.

Understanding internal and external condensation.

There are many factors that cause condensation in the home. These include a lot of moisture from cooking, heating, drying laundry inside the home and not ventilating the property. This is not the fault of the windows.

Another type of condensation is that found between the panes of glass on a double glazed unit. This typically happens on older windows and doors. If you see this on your windows, unfortunately the glass unit has failed, the hermetic seal has broken and the glass (not the window) will need replacement.

The final type of condensation is the type we are discussing here, found on the outside of your windows that is normal.

The location of your property, whether it faces east or west as well as it’s location in towns, cities or the country can all affect condensation on the outside of the windows.

If you do see this on your own windows, please be assured that it will disappear as the outside temperature rises in the morning and it is perfectly normal. Your new energy efficient windows are simply doing their job.