Historical Windows


Historic-type window (Chamfered) EV47/EV47 the inner sash is opening inwards, the outer – outwards. Both sashes are 47mm thick, both with single glazing (usually 4mm, up to 8mm thick glass is possible), which is sealed using silicone. The inner sash has a rubber sealing contour which improves the thermal and sound insulation of the window. Sealing may not be applied to the outer sash to prevent formation of condensate in the space between sashes and the glass from sweating. For the inner sash, we use the standard Roto NT fittings, the outer sash features special hinges and hooks, which similarly to Scandinavian outward-opening windows, allow locking the sash opened for ventilation. The historic windows usually have the decorative T-shaped handles.

Thermal conductivity coefficient of the window UW=2.2 W/m2K (calculated according to DIN EN ISO 10077-1), sound isolation 28-30 dB.


Chamfered window – it is probably the oldest design of a window. It is a double window or a single-layered window, sashes of which are inserted in a massive profile in straight, simple grooves. A chamfered window originated in Scandinavia where this type of window is popular even today. Sashes of a chamfered window usually open outwards and the profile is not embedded in the facade of the building, therefore the sashes are exposed to precipitation. A chamfered window is simply formed without expressive decorative elements. Given the fact that the window opens outwards, it is difficult to provide proper maintenance of the window on the upper floors of the building.


The finish system of wooden windows produced by the Finnish company TEKNOS offers environmentally friendly water-based varnishes and paints. The standard offer includes 54 tones of varnish and covering paints according to RAL or NCS catalogues.