After the structural frame of the building is completed, the external walls are constructed.

In the case of conventional buildings, walls are usually made of a double brick cell 8 cm thick. The two cells are placed at a distance of at least 9 cm appart, to accomodate the thermal insulation which is 7 cm thick.

Our steel frame house walls are  usually made with the thermal wall panels “3Δ” which is a revolutionary method for the construction of external walls, offering amazing multiple properties to the building. The panels consist of two parallel steel grids held together by welded steel bars, passing through a 20 kg/m³, 12 cm thick polystyrene thermal plate. The steel grids are at a distance of 2.5 cm from the polystyrene face, on both sides. During plastering which is of minimum width 50 mm, the panels are connected to the structural frame with steel rods, while all panel connections and different material joints are bridged with extra steel grid.

This way, after plastering, the structural frame and the external walls, create a unified structural cell system with the external walls contributing to the total structural strength of the building