The intelligent coupled girder system is one of the favoured assembly systems for buildings with many girder bays, large spans and higher loads. The special purlin assembly system allows the profiles to be assembled alternately in bays with a wide or narrow flange at the top. This results in rigid connections between the purlins and the girders.

The alternating profile position gives the construction great stability and also makes it possible to create continuous beams of theoretically unlimited length. In addition, the coupling girder system offers considerable potential for optimising such constructions in terms of weight. In order to achieve this weight saving with comparatively simple means, purlins with a lower material thickness are used in the inner spans than in the end spans. However, the continuous girder effect of the coupling system for the main supporting structure must be taken into account for this measure and, if necessary, consultation with the structural engineer must be held.