Design and color



Sliding windows

These windows are moved by sliding the sash within the plane of the window, which has the great advantage that no window parts project into the room. Sliding windows usually have at least two sashes, whereas one or more sashes may be fixed. The location of the window and technical requirements are to be considered, depending on design and function.


Lift and slide door – lift and slide and tilt doors

Lift and slide doors permit the generous design of space. Living rooms be opened to the garden, patios become living rooms. Interior spaces can be expanded to the outside, but remain unaffected by weather influences. Unusual dimensions are the best means for individualised architecture. To move these large and heavy elements, they must first be lifted out of their locked position. To do this, a strong lever moves eccentric rollers to lift and lower the sliding element. These rolling sashes can also be tilted, depending of the hardware used and the fenestration. The sliding elements are usually mounted at floor level.


Parallel slide and tilt door

These elements have a tilting position for venting and a sliding function to allow walkthrough. Depending on their size, they are manufactured from window or door profiles. Elements as large as are possible with the lift and slide type can not be built.


Sliding folding doors and windows

Sliding folding doors are custom designed and should only be installed in protected locations. They are manufactured from door profiles and custom profiles. Since the sash folds, almost the entire door or window area can be opened. Optionally, a regular side hung sash can be added to the left or right; all other sash elements are folded.


Fixed glazing in a frame

The panes are set directly in the frame of the windows. They cannot be opened. Access for cleaning must be provided for.

Opening types


The opening type of a window plays an important role in the architectural design of your house. Additional aspects, such as care and security, must also to be considered.


Whether side, bottom or top hung casement window, or tilt and turn, every type of window has its own specific features and advantages.

To make your purchase choice as easy as possible, we have put together the most common types of windows according to opening type and area of application.



Small Glossary of Opening types


Side hung window

They have sashes that open inwards or outwards. Sashes that open outwards are no longer very common. The pivoting axle lies in the side part of the frame and sash. Side hung windows that open into the room as called inward-opening. They have the advantage that the outer surfaces of the glass panes can be cleaned easily and safely. Disadvantage: side hung windows do not have a tilt position! If the window is open, rain or snow can enter easily.


Bottom hung window

When opening a bottom hung window, the sash pivots around the lower horizontal axis. It opens inwards. The sash tilts into the room from the plane of the window, opening a ventilation slit at the top. Disadvantage: The outer surface of the glazing is very difficult to clean. That is why they are usually found in cellar or secondary rooms and as clerestories.


Tilt and turn window

These windows are the most commonly installed windows in Germany today. The windows open inwards. They combine two opening types (hung and tilt) in one sash, which is their great advantage. The tilt and turn windows are operated with one centrally-located easy-to-reach handle. The windows should not be wider than they are high. Sashes which are too wide place too much load on the hardware and tend to sag.


Top hung window

When opening these windows, the sash is pivoted around the upper horizontal axis. Top hung casement windows usually open outwards and are often used as clerestories in gymnasiums and factories. They can only be cleaned from the outside. These windows should only be used where the outer surfaces can be accessed for cleaning, e.g. on the ground floor or in a conservatory.


Horizontally pivoted windows

These are generally large-sized windows, whose sash turns around a horizontal axis located in the centre of the window area. For practical reasons, the lower half opens outwards while the top opens inwards. Horizontally pivoted windows provide a particularly efficient natural air exchange for ventilation. Despite this, horizontally pivoted windows belong to the group of “special” windows. The advantage of this window type is that large window areas can be opened quickly and easily. Horizontally pivoted windows can be pivoted 180°, which makes cleaning easier.

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