→ Clear spacing between rips shall not be greater than 4.5 cm. → Width of the rib shall not be less than 7.5 cm → Overall depth of the slab shall not exceed four times the breadth of the rib → The thickness of the topping of a ribbed slab varies between 5 cm to 8 cm. → The breadth of a ribbed slab containing two bars must be between 8 cm to 10 cm. → The maximum diameter bar used in ribbed slab is 22 mm.