Everything speaks for the retrofitting of watertight and flood-resistant basement windows

The reasons for the heavy floods of recent years are manifold. However, it is not just the climate changes that play a role. Floodplains are still cultivated and in cities and villages the soil is sealed to the maximum. As a result, under special circumstances, the water can no longer run off, since overflow basins and urban drainage systems are usually not prepared for extraordinary volumes of water. Even in regions such as along the Lower Rhine, which seem to be flood-proof, floods are becoming increasingly common. The retrofitting of waterproof basement windows is therefore highly recommended.

What is the difference between waterproof and high water resistant?

Before you accept the first offer for seemingly watertight windows, you should inform yourself about special features of waterproof basement windows. First of all, you have to distinguish between "waterproof" and "high water resistant".

Waterproof basement windows

A "watertight" basement window is used when no water can penetrate the window over a period of 24 hours.

Flood-resistant windows

Basement windows that are resistant to flooding allow a certain amount of water to enter the premises. How much water is allowed to penetrate within these 24 hours depends on the size of the window.

How are the tightness values ​​given in basement windows?

The deciding factor is the window sill, ie the lower final window area. From here it is indicated upwards in centimeters to what extent a window is waterproof or flooding resistant, for example 80 cm above the ledge, 200 cm above the ledge, etc. This is due to the fact that the pressure in the water increases with increasing water level. For this reason, many waterproof and flood-resistant cellar windows made of acrylic glass. The values ​​for "waterproof" and "high water resistant" do not have to match! Always ask for both, if only one is visible.

Which construction methods of watertight windows are there?

Waterproof basement windows can be selected according to your personal needs. For example, there are waterproof basement windows that can be opened upwards and outwards. This has the advantage that any floods press the closed window even more firmly into the frame. But there are also large watertight windows that can be closed either manually or automatically. Such windows often consist of the already mentioned acrylic glass and have in the middle of another ventilation window, which is still open at an underlying water level.

With or without ventilation or completely closed

There are also windows that look like ordinary basement windows and can also be opened inwards. The difference is inside these watertight windows: the frames are often made of fiberglass reinforced plastic, while the window has up to 15 or even 20 locking points to the frame. The last large group of watertight and flood-resistant windows are the basement windows, which can not be opened at all.

Do you need to forego other advantages of watertight basement windows?

Many homeowners fear that waterproof flood basement windows will do less well at other points. So for example the burglary protection. The is partly even better than that of conventional basement windows. Another important aspect is the thermal insulation. The UG value indicating the thermal insulation corresponds to that of high-quality insulating glass in most waterproof cellar windows. In principle, you kill at least three birds with one stone.

waterproof and highly water-resistant

  • extremely burglar-proof
  • the same high energy savings as heat-insulating glass
  • In addition, many waterproof cellar windows are equipped with a modern, inconspicuous design.

Tips & Tricks

The installation of flood-resistant and watertight basement windows should be left to the competent expert. Because it does not help you if the window, but not the area between soffit and window frame is tight.

Only use brand windows of renowned window or special window manufacturers.

If necessary, ask a specialist to look at your cellar on site. He may also be able to discuss other tips and construction options, such as the installation of backflow stops, for comprehensive water and flood protection.

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