An integral part of the ceiling system is the KB joist XC. As a standard, the welded trusses consist in: Dual web braces of members 5 mm in diameter, a pair of members of the main tensile – bottom – bar of variable diameters and one top member 8 mm in diameter.
The truss is 130 mm high as a standard and the total joist is 150 mm high; the concrete footing is 122 mm wide, the joists are 1.0 to 7.6 m long and a 1 m joist weighs approximately 13 kg.