The single-rib flat intrados roof slab (HEZ) for flat roofs is produced in heights of 40 cm and 70 cm and has a lower layer with a modular width of 250 cm and a flat intrados, and a central vertical rib with variable thicknesses of 10 cm, 15 cm and 20 cm.

The single-rib flat intrados roof slab (HEZ) can be produced in widths smaller than the modular size of 250 cm and with variable lengths up to 25 m, depending on the specific project requirements, within the limits of structural feasibility, allowing ample flexibility in system dimensions. They are designed for high working loads usually between 5 kN/m2 and 30 kN/m2.