Certificate & Specifications

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Glass Facades

Sunny Views!

Passive-energy houses are very often fitted with facade glazing facing south. In order satisfy these requirements in wood as well, this special OPTIWIN facade system was developed. The OPTIWIN Glass Facade consists of a load bearing wood construction, which is covered with either wood or aluminium outside.

As with all OPTIWIN-Window Systems, the outer layer serves as a protective coat and is detachable and interchangeable, allowing for flexible and individual colour designs


  • High level of pre-fabrication

  • Rapid installation times

  • Interior layer is the load-bearing structure

  • Short renovation times due to removable outer layer

  • Wood types: fir, spruce, larch, oak can be combined for inside and outside

  • Slender frames, elegant design

  • Custom colour schemes for inside and outside, use of natural oils thin or thick-layer finishes

  • Special functions: sound insulated and protected from the sun and against burglary

  • Custom detailed planning

  • As low as Uw 0.72 W/m2K (Ug 0.6 W/m2K, Uf 0.69 W/m2K)

  • Suitable for passive-energy houses (certificate: PHI Darmstadt) European patent


Passive house compliant

The OPTIWIN Glass Facade is mounted on a wooden post-and-mullion construction. The spacer to the exterior facing is thermally separated and consists of wood and wood fibre insulation. The pane-weights are held up by statically calculated glass brackets.

The OPTIWIN Glass Facade is a suitable „passive-energy house component“ certified by the Passive-Energy House Institute in Darmstadt. The prerequisite for this is an average heat-transmission coefficient (UW) for the entire construction of no more than 0.8 W/m2K.