The advantages of BERTRAND windows made of wood:


  • elegant and aesthetic
  • durable and highly resistant to weather conditions
  • heat-insulating and energy-saving
  • effectively mute noise
  • adjust the indoor air humidity by absorbing and releasing it
  • ecological (made of natural, renewable material)
  • healthy

Wood is a proven, elegant and natural material, which for many years has successfully been used in the window joinery. Our offer includes windows made of various species of wood, such as pine, oak, sapeli, meranti, Siberian larch and others, depending on the Clients’ requirements.


We all strive to feel good in our immediate surroundings. We search for items made of natural, human-friendly materials. Certainly, wood belongs to such materials. The natural wood structure is porous and fibrous, which is why the products made of wood are stable and durable. Wooden windows stand out with their exceptional elegance, create a pleasant atmosphere and a healthy atmosphere. Thanks to the application of modern technologies in preparation of wood and its treatment, we managed to bring out the most important advantages of this material and obtain the joinery with a high degree of durability and functionality, ensuring comfort and safety for the users.

High standard


For the production of window joinery, wood is specially prepared, because the technology of manufacturing the glued wood profiles demands careful preparation of materials. The first stage is the selection of raw material – the best wood is selected, without knots, grey and discoloured spots. Then the wood is subjected to a drying process (up to 12-13%, depending on the species of wood) and impregnation (against fungi and against mould.) After the preparation, the boards are glued in three, four layers, and then laid in such a way, that the internal stresses appearing in the wood abate each other, and the profile remains straight. This is currently the best way to eliminate the wood defects, such as warping due to the changing humidity conditions. After gluing, it has better technical parameters than a solid wood with the same cross-section.


On the outer side of a window casing and sashes, we placed the aluminium drip cap, which prevents the destruction of window elements that are most exposed to the UV radiation, and which ensures tightness against rainwater penetration.


Each element of the window is hand ground and covered four varnish coatings of the best quality. We offer the option of painting the windows with an opaque paint in RAL colours, or with transparent or semi-transparent varnishes (glazes). You can also order windows with a different colour on the outside and on the inside. The use of transparent or semi-transparent wood varnishes perfectly emphasizes the natural texture and the grain of wood.