During the construction of the passive house, the thermal insulation performance of external wall panel is the key element, where it is required to accurately calculate panels’ thickness and thermal conductivity according to the energy consumption index. Besides, the installation of them used to require a large number of metal anchors for fixing, with no less than 5 pieces per square meter. Since metal parts are the main heat loss source, so panels often had to be thickened to reach the desired thermal index, which is a big waste of the materials.

Besides, thermal/cold bridges inclines to occur at window frames, ring beams, pillars, etc. Grünbau, by eradicating these metal anchors and adopting high-quality passive construction parts to reduce heat loss.