If the footing depth is 800 mm then top reinforcement is required for shrinkage cracks?

Yes, if the footing depth is 800 mm, top reinforcement is typically required to mitigate shrinkage cracks. Shrinkage cracking can occur due to the drying of concrete, especially in deeper footings. Proper reinforcement helps control these cracks by providing tensile strength where concrete is weakest, enhancing the durability and structural integrity of the footing.