Bertrand Windows and Doors


A modern system made of wood and aluminum

We offer windows for customers who value natural wood and at the same time want to ensure maximum durability of their windows with minimal maintenance costs. wood-aluminum Alutrend.

Installation depth



1.1-1.2 W/(m²K)

  1. The surface of the frame and sash is flush from the outside.
  2. Wooden-aluminum system with three depths: Standard, XL, MAX.
  3. A wide range of wood species.
  4. 3 seal lines.
  5. Double or triple glazing.

Their construction uses beautiful, natural wood on the inside, and durable and easy-care aluminum on the outside. The total depth of the window frame is up to 90mm. The air space between the wooden and aluminum frames provides an additional insulator. Therefore, the windows have a better heat transfer coefficient (1.1-1.2 W/m2K) and are characterized by increased acoustic insulation compared to standard wooden windows.

The Alutrend system offers great color and aesthetic possibilities. From the inside, windows can be made of pine, meranti and oak wood, painted with transparent paints (with visible wood structure) or opaque paints (according to the RAL color palette). Aluminum overlays (the outside of the window) can be painted with a special technique imitating various types of wood (so-called decor) or uniformly in colors from the RAL palette.

Alutrend Linear is characterized by the fact that the surface of the frame and sash is flush from the outside. This is a proposition for people who prefer classic simplicity.

Alutrend Linear system it is also available in a widened version with a 78 mm deep wing (Alutrend XL 78 Linear) and in a version with an angular finish of the inner wing strip (Alutrend Qube 68 Linear) as well as in a version combining both of the above options (Alutrend XL Qube 78 Linear).

Product ALUTREND LINEAR comes in the following versions

ask about the product

If you have any questions about the ALUTREND LINEAR product or are interested in cooperation, do not hesitate - fill out our contact form.