Insulate windows professionally

At the latest, when the winter is back in front of the door, it is a big topic - the optimal isolation of windows. Depending on which windows you have installed and to what extent your house meets the requirements of the thermal insulation ordinance, you can consider different measures to isolate the windows. Below is an overview of how to professionally isolate your windows.

Long time the biggest energy loss

For many decades, the windows were the greatest weak point when it came to thermal insulation. Even if the façade was still so well insulated, the windows were in the 1970s, despite the first insulating glazing in the 1970s and 80s until the 1990s the most important weak points.

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When it comes to window insulation, the focus is no longer just on the glazing

But the limits of feasible insulation for glass have long been reached and the focus is on the following elements.

  • Window frames
  • Window reveal

How an insulating glass window works

In order to understand this, it is necessary to know the basics of how insulating glass works. The cold outside air is just as permanently in motion as the warm air inside a building. With single glazing, new warm air is always fed in front of the window and transported away by the outside air, which is also constantly moving. In principle, one-piece glazing works like a heat exchanger.

The heat exchange from the inside to the outside is stopped

If the space between two thermal insulation glasses is now filled with an inert gas in an airtight and gas-tight manner, this gas layer is almost at a standstill. This means that almost no heat is released to the outside. With three-part thermal insulation glazing, this effect is improved by up to 25 percent.

Insulation of the window frames

Modern window frames have therefore been the next possible weak point. That is why window frames have now been developed that are equipped with appropriate thermal insulation. You can recognize these window frames by the RAL quality mark.

The window reveal

With the thermal insulation of the window frames, the next weak point came into focus, namely the connection between the window frame and the reveal, i.e. between the window and the facade. This is the so-called building connection joint. If the windows and doors are now installed according to RAL, you will also achieve optimal thermal insulation here.

Temporary isolation measures

But you cannot always insulate heat-insulating windows so efficiently right away. That means, under certain conditions, provisional transitional solutions are necessary or the thermal insulation glazing according to the EnEV takes place gradually.

Different options

Depending on how good or bad the insulation values of your windows are, you have different options. In the case of temporary insulation, special insulating foils will help you with single glazing.

Efficient insulation of single-pane glazing with insulating film

These insulating foils are not glued to the pane, but to the window frame (always follow the manufacturer's instructions). These foils already help to prevent an enormous amount of heat from escaping, as they create a space between the glass pane and the foil in which the air is hardly moved. Accordingly, the heat can only escape to a limited extent.

According to most manufacturers, the film should be replaced after a year. However, reports from users have shown that the slides sometimes last up to 5 years and even longer. Of course, the benefits must be greater than the costs.

Costs and benefits of insulating foils

Through single-pane glazing the size of one square meter, around 100 watts of heat escape at an outside temperature of zero degrees. Projected over a year (and of course depending on the energy cost level, which is more likely to rise than fall), the losses are around 40 euros per square meter. In contrast, the price of the film is only 5 euros per square meter.

Use window frames as close as possible to class 1

But the windows alone are not enough. In the case of window frames, the thermal insulation effect is better, the lower the classification within the frame class. In an existing or old building, class "1" should be achieved, that of low-energy houses is even significantly lower. So under certain circumstances it can make sense to only temporarily swap the window frames to a more efficient class.

Isolate the building connection joint

The last important weak point remains the building connection joint. So far, foam rubber sealing tapes, the structure of which is spongy, have primarily been used for insulation. However, new sealing tapes have a very dense, sometimes even compressed structure. This type of foam rubber sealing tape is much more efficient.

Tips & Tricks Under certain circumstances, it makes sense to wait and see whether the windows are insulated more extensively and with a somewhat lower insulation effect, which is correspondingly cheaper. The first intelligent windows that are ventilated and, depending on the temperature, the windows from the outside to the inside or from the outside to the outside etc. are already coming onto the market. ventilate. Even insulating windows equipped with solar technology are now getting ready for series production faster and faster. It would therefore make sense to compare how much more energy you can save if you only insulate temporarily and wait a few years with complex and highly efficient insulation.

You don't always have to just insulate the windows yourself. Especially if you are already using thermal insulation glazing, but still do not achieve satisfactory values, you have to look for the cause elsewhere. Until a few years ago, roller shutters still offered an effective thermal insulation effect. But the efficiency of modern thermal insulation glazing has now neutralized this effect. On the contrary: are the shutter boxes inner, and also through the belt guide (leather blinds), they lose a lot of energy.

To do this, you must remove the shutters and seal the roller shutter box accordingly. Under no circumstances use PU foam (construction hob). He is thermally insulating, but not airtight. Thus, cold bridges would arise here because cold air can be transported and condensation would have to lead to mold in turn.

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