For Press

Glass fogging up – a minor glitch or a serious problem?

Tczew, 20 March 2011 – Along with spring comes the building season. This is a period of time when we can think about removing glitches in our house that appeared during winter and autumn. One of the problems might be condensation – the drops of water that appear on our windows. It is very often considered to be a defect. Is it justified? See what is behind this process.

Condensation of steam on the surface of windows is very often considered a defect of the window which may be expensive to fix. But thinking this way is wrong. The liquefaction of steam on the window glass is a natural physical phenomenon that bears testimony to the high quality of comlex glazings. Why is that so? As a result of warm and humid air meeting a colder surface the air cools down and gives out some of its water which then condenses on the surface of our window and fogs it up.

Water on the outside side of the window

Condensation usually occurs on the outside side of the window. It is because complex glazings have very high thermal insulation parameters (low heat transfer coefficient U). It means that a very amount of warm air manages to get outside the room. The outside glass remains cold and it is this glass on which the whole condensation process take place. This process is very common in the regions of high air humidity e.g. Nearby water reservoirs where in the morning air heats up faster than window glass.

Water on the inside-room side of the glass

Condensation usually occurs on the outside side of the window. It is because complex glazings have very high thermal insulation parameters (low heat transfer coefficient U). It means that a very amount of warm air manages to get outside the room. The outside glass remains cold and it is this glass on which the whole condensation process take place. This process is very common in the regions of high air humidity e.g. Nearby water reservoirs where in the morning air heats up faster than window glass.

Water inside the window

Unlike previously mentioned processes, water between the glass panes is a problem. Its cause may be window unsealing which often involves its replacement. In this case the only way is to turn to a right service.

How can we prevent condensation?

We can prevent it from happening by letting some fresh air into our rooms by e.g. airing. 'Fogging up inside usually occurs due to bad ventilation. What is why the first thing we should do is to check whether the gravity ventilation is effective enough and, if not, replace it with a mechanical one. You can also choose windows with in-built ventilation - a basic supplement to all Vetrex windows. It is also worth using glazings of low Ug parameter. An addendum to this glazing would be installation of the glazing on a warm spacer frame that, thanks to the use of a special absorbent, absorbs humidity from the inside of the window. A perfect frame would be one made of stainless steel or plastic material because it prevents the occurrence of co-called 'thermal bridge'. Unfortunately, even the best window will not eliminate this problem in rooms with a high humidity level. In such case it is advised to equip the window with a proper airing device e.g. Humidity-sensitive or pressure air inlet. – explains Marek Szade, Brand Manager Vetrex Co ltd.

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Since 1997, Vetrex Co ltd has been one of the leading window and door joinery service providers for individual customers and huge, medium and small business and public institutions. In our offer you will find PVC systems, plastic PCV windows, aluminium systems, aluminium - wood, fire-proof and additional accessories such as: Ventilation systems, blinds and security systems, which are the supplement to our main products. Thanks to developed network of distribution of Vetrex PVC windows and doors Are present in almost every Polish city.