L and OT:
– beams can be prestressed or classical reinforced
– maximum height h = 80 cm
– width adjusts if necessary
– maximum L = 14 m ‘

Roof “T” girder:
– the height is fixed (100 cm), the width can be increased and reduced if necessary
– the height insertion v = 50cm served to increase the cross section height to 150 cm (fixed)
– can be prestressed

Roof “T“ beam:
– the height of the beam is 55-70 cm
– the rib width is fixed and the width at the top of the beam is maximum 60 cm
– the maximum length of the beam is L = 12 m ‘
– can be made classical and prestressed