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Building materials 2023

Elegant View: Flush-fitting Windows In Drywall

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Elegant View: Flush-fitting Windows In Drywall
Elegant View: Flush-fitting Windows In Drywall

Video: Elegant View: Flush-fitting Windows In Drywall

Video: Elegant View: Flush-fitting Windows In Drywall
Video: How to install a windowsill and drywall reveals quickly ? (English version) 2023, April

Completely flat walls can also be implemented when installing windows in drywall construction: a new system window is installed flush with the surface and ensures bright rooms and a modern wall look. What is innovative about it is that not only the glass runs flush with the wall surface, but also the frame.

Author: Susanne Sachsenmaier-Wahl / Photos: Knauf

There are many reasons for windows in drywall construction: sometimes they should provide more perspective or promote communication, then they should provide additional light. However, windows in the partition walls are sometimes used due to regulations, for example if the workplace directive requires rooms to be visible from the outside. In addition to office partitions and meeting rooms, windows can also be found in patient, recovery and waiting rooms as well as in laboratories. Even in living rooms - just think of cubes that are placed in the room - windows in the inner walls are conceivable. And in restaurants, glass surfaces loosen partition walls between individual areas, such as the smoking and non-smoking areas.

Regardless of the reasons why windows should be installed in drywall construction - the visual appearance should not be negatively influenced by them. Architects in particular, but also many builders, find protruding window frames in the partition as bothersome. Instead, flush-mounted windows are preferred. With the help of a new prefabricated window, this wish can now be realized quickly and safely.

Drywall windows: Well thought-out system

The innovative prefabricated window allows glass surfaces up to a size of three square meters. If larger window areas are required, the individual windows can be linked into a row with an intermediate UA profile. Floor-to-ceiling designs, as they are often used in modern architecture, and skylights are easily possible. The installation can be done in portrait as well as in landscape format. Where there are no increased requirements for fire and sound insulation, the standard version of the prefabricated window can be installed. Higher demands up to radiation protection are covered by special variants that can be requested from the manufacturer.

The window is delivered in two parts, the base frame and the glass elements. The latter consist of two eight-mm thick single-pane safety glass and are simply clipped into the aluminum frame after the wall is finished. In the groove of the window base frame, plastic clips are already attached at both sides at a distance of approx. 150 millimeters. These later serve to accommodate the two halves of the window. In addition to the usual dry construction tools and siphons for inserting the glass elements, the processor does not need any aids. Since the installation is relatively easy due to the prefabrication, standard knowledge in drywall construction is sufficient.

Creation of the substructure

The prefabricated window is intended for installation in double-layer clad metal stud walls with a total thickness of 125 millimeters. The manufacturer produces the window to the extent requested by the customer.

The metal stud wall is assembled in the usual way. The installation of the window base frame is carried out together with the substructure. The base frame is secured by chipboard for transportation. This transport lock remains in the frame until the wall is completed to ensure that the frame is perpendicular. To attach the base frame, a stop profile is set vertically in the U-profiles on the ceiling and floor and fastened using the crimping pliers. Then the frame is screwed to the stop profile at the desired height. In the case of one-man assembly, the frame can be supported by an assembly aid (a board or similar) during screwing. After the frame has been attached to the first stop profile, a second stop profile is mounted on the other side of the frame.

Now the horizontal change profiles follow. The flanges are cut diagonally according to the clear distance between the two stop profiles and bent 90 degrees in the direction of the flange. The flanges are connected to the stop profiles by screws. To support the weight of the finished window, additional stand profiles are placed below and above the horizontal alternating profiles. This creates a stable construction that can take the weight of the window, which is around 54 kilograms per square meter, without damage.

Plane plane area

Now the planking of the metal stand construction can take place. The gypsum boards are brought up to the frame. The cut edges of the gypsum boards at the window openings must be chamfered so that the frame profile of the window can be filled later. If the substructure is covered, the transport lock in the base frame can be removed.

After all panel joints have been filled and sanded and the wall surface has received its desired surface finish (painting, plaster, wall covering, etc.), the glass panes can be used on both sides with the help of two suction lifters. The panes snap into the base frame. The glass pane can be removed at any time in the same way for cleaning purposes.

The great advantage of the system is that the entire wall, including the windows, is manufactured by the specialist contractor from a single source. This not only pleases the craftsman, as it increases the added value. The client also benefits because the construction process is optimized and the effort for coordinating the work is reduced.

A video on the subject can be found here:


Photo: Knauf

A vertical connection profile is inserted into the metal stud wall created as usual.

Photo: Knauf

The planking is brought up to the frame, the edges are chamfered.

Photo: Knauf

After planking, the transport lock in the base frame of the window can be removed.

Photo: Knauf

When the wall is completely finished, the panes can be clipped on.

Photo: Knauf

The stop profile is attached to the U-profiles on the ceiling and floor by crimping.

Photo: Knauf

The prefabricated window base frame is placed in the wall (possibly with assembly aid).

Photo: Knauf

The window base frame is screwed to the first stop profile.

Photo: Knauf

The second vertical stop profile is screwed to the window frame like the first profile.

Photo: Knauf

The flanges of the horizontal interchangeable profiles are cut diagonally and bent.

Photo: Knauf

Interrupted stands are installed vertically for additional stabilization.

Photo: Knauf

The fully installed frame can take the weight of the window.


The flush finished window is offered by Knauf under the name "FlatWin".

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