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A classic Material: Timber Windows

High Quality Timber Windows guarantee traditional aesthetics and modern thermal insulation values

Timber has been the number one material for windows and doors for centuries. Nowadays, aluminium and uPVC windows impress with their longevity and affordable prices, whereas wooden systems still have the best insulation properties, while still allowing for natural air circulation. From security to humidity resistance – investing in a wooden window pays off in the long term. Personalised products give unique aesthetics and a warm living atmosphere for decades.

Timber windows – Renewable raw Materials

Environmental protection is a very important issue nowadays. One advantage of timber windows is the renewable material which they are made of, whereas aluminium and uPVC elements are made of finite resources. Whenever meranti, oak and spruce are used for construction, new trees are planted at the same time. This guarantees steady resource supply – which is an essential advantage in comparison to aluminium or uPVC components. Timber windows generally feature:

  • Excellent sound and thermal insulation
  • Air circulation properties (breathability)
  • Weather resistance
  • Excellent burglary protection

Timber only has a few disadvantages in comparison to uPVC or aluminium. Although thick wood has immense resistance against negative weather influences, aluminium still offers better properties. The lower heat protection values of aluminium – even with multi-chamber profiles – are still not comparable with the excellent insulation properties of wood. uPVC on the other hand is a significantly cheaper alternative than the natural material, but it is neither as robust, nor does offer the same degree of breathability.

The prices for wooden windows are therefore located in the upper section of the price range, because they are only manufactured with high quality woods – such as meranti, oak, spruce or oak. Besides the selection of appropriate woods, it is also necessary to post-treat the material in order to achieve the best surface quality. Impregnating woods additionally supports natural water repellent properties and protects against fungus infestation. The sealing of the material itself is performed with a full lacquer covering, protecting wooden windows from atmospheric influences and offering a shiny exterior.

Knock on wood – An Overview of the different Types

Timber components are available in various wood types, differing in terms of appearance and properties.

Please pay attention to the correct calculation of the U-value before the selection of the respective wood type. Thermal insulation of timber windows depends primarily on the glazing, as it covers most of the surface.

With respective features – such as a "warm edge" – it is even possible to increase the raw U-value of the window.

uPVC is the more favourable material, whereas massive wood and aluminium are normally rather costly components. It is therefore important to consider the advantages and disadvantages when choosing from the high-priced materials.

Oak Spruce Larch Pine Meranti
U-value in W/(m2K) with a construction depth of 78 mm 1,52 1,24 1,24 1,24 1,24
Hardness very hard soft soft soft hard
Longevity high low middle middle high
Colour brown light brown red light brown red-brown

Optional Composite Material

Composite windows are even more cost intensive than purely wooden elements, since their wooden core is covered with a light metal profile from the outside. This results in excellent insulation, breathability and the aesthetics of timber, combined with longevity and weather resistance of the light metal component.

The relatively costly elements guarantee resilience and extremely low maintenance in comparison to full timber windows.

Proper Care of your Timber Windows

The amount of necessary maintenance of timber components is not as large as often claimed. Contemporary window models require few maintenance steps, thanks to modern construction methods. Furthermore, they work properly for a longer period of time and will remain aesthetically pleasing for years. All they need is regular cleaning. Make sure to use:

  • Warm water
  • Washing-up liquids
  • Soft cleaning pads
  • Wood care milk

The cleaning procedure of the frame is performed in the same way as with uPVC or aluminium windows. Always make sure that treated surfaces are not damaged by steel wool or other cleaning devices.

It is recommended to apply wood care milk twice a year after cleaning. This milk is available from any timber window manufacturer or specialist retailer. The milk adds a thin layer to the timber surface to protect it from dirt.

A new lacquering for timber windows is normally necessary every 5 years. But you can easily determine the necessity of new lacquer by checking the colour. Faded colours and brittle pieces of lacquer are a sign that lacquering is necessary, since the layer is losing its ability to protect the surface.

Damages, such as fine cracks or brittle pieces, should always be tended to, as this can have an impact on the humidity protection of the window and negatively affect longevity – no matter if the windows are made of spruce, larch, pinewood or more durable woods like oak or meranti.

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