The cross-sections of the trusses are shown in Fig. 3. Two different formats were used. For Trusses numbered 1–8 the format in Fig. 3a was adopted and for Trusses 9 and 10 the format is shown in Fig. 3b. The trusses consisted of continuous chords with regularly spaced compression struts and diagonal tension ties. The ties were manufactured from 50 mm wide flat steel strips placed between the two parts of the horizontal chords. Thus the clinches were formed through three steel layers. The compression struts were stiffened using return flanges, forming a Z profile to increase their buckling resistance. The web of the struts continued into the space between the two halves of the chord forming a similar connection as the diagonals. The chords were produced in thickness of 1.5 and 1.2 mm thicknesses and the diagonal ties in thickness of 1.2 and 1.0 mm.