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Paddy's DIY – Window Condensation Part 1 : Exterior surface of glazing
Another great video brought to you by Paddy's DIY

This video is the 1st of three, about condensation that forms on windows and doors.
1. On the exterior surface of the window (The good )
2. On the interior surface of the window or glazing (The Bad)
3. In between the two panes of glass in a double glazed unit (The Ugly)

In this video I’m going to be talking about condensation that forms on the exterior surface of the windows and glazing.
Condensation that forms on the exterior surface of the glazing is a relatively new phenomenon, and it is a good sign. It can occur on any double glazing but is more prevalent is new windows and doors that have highly insulated double or triple glazing installed.
Here is an example of the condensation on the outside

So let’s go through what causes it to form.
This is a cross section of a highly insulated double glazed unit. The orange section on the left represents the warm interior of a home, and the blue section on the right represents the cold exterior. The double glazed unit is constructed using specially coated glass that reflects heat back into the house. The space between the two panes of glass is also filled with an invisible gas (usually argon); this increases the insulation of the double glazed unit.
The heat that would normally escape through the glazing is now being reflected back into the room. Because there is very little heat energy making its way past the interior pane of glass and gas fill. The outside pane of glass stays the same temperature as the outside air. The condensation usually forms in early morning, as the sun’s rays start to increase the outside air temperature. The outside pane of glass takes some time to warm to the same temperature as the outside air. This is when the condensation forms. The outside pane of glass is colder than the outside air temperature. Humid air comes in contact with the cold surface and condensation forms. It only tends to last for about an hour and then dissipates.
If this happens on your windows, it’s nothing to worry about. It’s actually a good thing. It is a sign that the glazing is doing its job.
So that’s it for the first video in this series. Please give a thumbs up and hit that subscribe button. The next video in the series will be about condensation that forms on the interior surface.