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Installing windows

The window

Rund ums Fenster

Lintel / Reveal / Strip / Handle / Casement

Correct installation

1. The windows must be fixed so that all loads acting on them (own load, wind load, casement load) can be safely transferred onto the building structure. The load transfer takes place via bearing blocks which may only be placed under pressure strain.
2. Insert the window precisely vertically into the wall opening. Using spacers, fix the lateral distance to the masonry and wedge in diagonally using wooden wedges (fixed but not under tension).
3. When fastening using frame anchors, a hole is drilled into the lateral window fold and into the masonry. Now the frame anchor can be installed and the window fastened. A further possibility is to fix the window using steel straps which are hammered sideways into the masonry and are then screwed onto the window frame.
4. Insert the window casement and check the function. Then the joint between the masonry and the frame can be filled using foam.
5. After hardening, any excess foam can be cut off diagonally inwards using a knife. Wedges used to fix the window can then be removed.

Lattice windows

Lattices are a highly popular window design element. Even though they look identical, they do differ in their construction and mounting methods.

1 True window lattices: These subdivide glass surfaces into individual panes.

2 „Viennese“ lattices

3 Applied lattice frames

Shapes, colours and materials

Window shapes

Side-hung window
Two-part windows
Fixed glazed window
Pivoting window
Bottom-hung window
Side-hung window, two-part
DIN left, DIN right

The window dimensions are frame measurements, i.e. the outer limitations of the window in width and height. The window opening must be at least 4 cm larger than the window dimensions in width and height. Prior to ordering, measure out all window openings. Even openings which look the same may be different. Also determine the correct opening direction.


Wooden windows are a highly traditional choice, and are still widely used today, in spite of them requiring more care then other types of window. Favourite wooden windows are hardwood, pine and spruce, but larch and oak are also used.


Plastic windows meanwhile represent a substantial share of the market. The material PVC can be used to easily produce even complicated window shapes. In order to achieve high levels of heat protection, window profiles consist of several chambers, and are generally thermally separated through seals. A metal core is often integrated for stabilisation.


Aluminium windows play a subordinate role in private residential construction.


Windows with single glazing are no longer common today. Today, double-glazed windows are the norm, which consist of two panes of 4 mm in thickness which are installed 10.5 to 16 mm apart. The intermediate space is either dehumidified or filled with gas. If the glass in this intermediate space mists up, it is not tight or the glass has been damaged. Further variations such as three-pane thermal protection windows, sound insulation glass or laminated panes round off the range of window glazing options.

RAL quality symbol

If a window is of a high technical standard, it can bear the RAL quality symbol. You are assured of good quality when procuring windows with this symbol.

Tools and old windows

Spirit level
Folding rule
Wooden wedges
Spacers and bearing blocks

Sealing old windows

Single-glazed windows are major thermal bridges. Where it is not possible to replace such windows, use window foil or acrylic glass. Window foil is fastened to the window frame using the double-sided adhesive tape enclosed with it.
Heat the foil with a hairdryer to tension and smooth off any wrinkles.
On newer windows, seals are inserted into a circumferential groove. It is possible to retrofit older windows with self-adhesive sealing tape. This is available in different thicknesses and shapes.
Joints and transitions between the walls and window frames can be sealed using silicone compound. Prior to applying the silicone compound, clean the appropriate areas. After even application, the silicone is smoothed off using your dampened finger. To do this, add a little washing-up liquid to the water.