We’ve all seen condensation on the inside of our windows, right? (Read our blog here to find out what to do about it.) But have you ever seen condensation on the OUTSIDE? If not, and you’re considering upgrading your windows to some of the beautiful ones we sell here at Red, it’s something that you need to think about.  Here’s why.

It’s all to do with something called the ‘dew point’. (Sorry – we’d like it to be a bit sexier than that, but it isn’t.) It’s the temperature to which air needs to be cooled to become saturated with water. Then, when that saturated air hits an even cooler surface, it condenses to form liquid water, or dew.

OK, OK, but what on earth has that got to do with windows? 

Well, believe it or not, with high-performing windows, this means that at certain times of the year your windows may be prone to condensation – on the outside. This is particularly true where the windows are north-facing, so any heat from the sun doesn’t hit them until later in the day.
Windows today are designed to keep heat inside the building, which means that every part of them, including the glass, is constructed so that it transfers as little heat as possible from the inside to the outside. While the surface of the window glass inside your house may remain warm, the surface on the outside stays relatively cold, providing a cold place for dew to form. 

 So, on a cold-ish morning in Spring or Autumn, you may pull back your curtains to find your view obstructed by condensation on the outside of your windows.

Technically-speaking, unlike internal condensation, this isn’t a problem. Actually, it’s a sign that your windows are performing well, and windows are designed to cope with moisture externally. But from an aesthetic point of view, it’s something you may want to consider when deciding what windows and doors you want on north-facing elevations.

If you want to talk through any of this with us, give us a call. Just part of the professional service here at Red – giving you real-world experience and expertise.


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