Certificate & Specifications

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Sustainable values, which in addition to technical perfection also include individual and emotional qualities – thus guaranteeing you long-term comfort, security and unbeatable service. OPTIWIN: Quality from Master Craftsmen. >> READ MORE

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Never paint a window again!
The Alu2Wood-window consists of an inner layer, which performs the actual window function. The (removable) outer layer is made of aluminium.

The window frame is no longer visible from the outside.
Therefore, compared to conventional aluminium windows, it is possible to have extremely slender frames and elegant frame widths. OPTIWIN achieves this through very narrow sashes and frames, which are almost completely insulated.

The excellent heat insulation characteristics of the Alu2Wood-Windows make it one of the most cost-effective passive house windows of its time. The system is patented across Europe.

You gain a unique advantage in energy efficiency and construction physics with the window rabbet solution.


  • Suitable for all window types (multi-sash, custom designs, sash bars...)
  • Interior layer implemented as a statically bearing structure
  • Short renovation times thanks to removable exterior layer
  • Interior wood types: fir, spruce, larch, oak
  • Removable aluminium exterior layer
  • Slender frame, elegant design
  • Custom colour schemes for interior and exterior
  • Special functions: sound insulation, sun protection and intrusion prevention
  • Custom detailed planning
  • As low as UW 0.70 W/m²K (Ug 0.5 W/m²K)
  • Certified thermal bridge free connection (PHI Darmstadt)
  • For renovations, also possible without frame insulation (UW value determined according to respective installation situation)