Certificate & Specifications

Our Products

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

Become a Trade Partner

Impressed by our OPTIWIN-Products and want to become a dealer yourself? All the benefits you enjoy as an Freisinger Trade Partner can be found here. 


Weather? What weather?
This system offers the same advantages as the Alu2Wood-technology. The protective outer layer can be removed by turning the connecting elements, thus reducing renovation or exchange costs. This system takes full advantage of the special features different wood types offer.

Weather-resistant wood
For the exterior layer OPTIWIN uses mainly woods like larch or oak. These woods are naturally very weather-resistant making external surface treatment unnecessary. For the interior, spruce or fir are suitable wood types as they possess the appropriate density and excellent static characteristics.


  • 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
  • Wood types: fir, spruce, larch; oak for interior and exterior is possible
  • Slender frame, elegant design
  • Custom colour schemes for interior and exterior, natural oils, thin or thick layer glazes
  • Special functions: sound insulation, sun protection and intrusion prevention
  • Custom detailed planning
  • As low as UW 0.69 W/m²K (Ug 0.5 W/m²K)
  • Certified thermal bridge free connection (PHI Darmstadt)

Passive house certified

The OPTIWIN Wood2Wood-Window has excellent heat insulation characteristics, is available in a passive house compatible variant and is patented across Europe. It has been certified as a connection free of thermal bridges by the PHI Darmstadt.