Window frames can be made of various materials, which are also combined. They can be wood, aluminum, plastic, steel or wrought and cast iron. The oldest material for windows is natural wood. The regenerative and house of very good material to be is therefore still exist today with a very high market share. This is the good thermal insulation and the aforementioned processing option to owe. A problem in the processing of wood for windows is the poor weather resistance. Although this use of modern coatings could be reduced, there is still an increased maintenance costs.
In combination with an aluminum can, however, realize this version without problems. For the defense works of aluminum on the outside of the window a good protection against weathering, while the original, warm feeling of wood remains in the interior. All-aluminum as a window is particularly common in public buildings and office complexes used. This results not only from the high durability of this material, but it also contributes to the functional, so sometimes wanted to cool atmosphere of this building forms. Even fully glazed facades have aluminum frames, but these are separated for better insulation and isolation in plastic. The other way inside the plastic window frame and sash with aluminum or steel reinforced, as plastic can exhibit high wear and tear effects. The finishing of wood and wood imitations can be observed frequently. Steel is often used only if the building does not represent claims on the insulation of noise or heat. In connection with thermal insulation, steel is extremely durable material still at high stress, such as in public or high traffic areas, the building material of choice.