Hello, we received a request to build a helipad on the roof of a hospital business that is under construction. I did some research, but I couldn't find enough information about static accounts. In my conversation with Civil Aviation, m2 was said to be 6-7 tons, but this value was too much for me. They were not technical people, I think they meant the 6-7 tons weight of the helicopter. What are the criteria that I should pay attention to in the design of the helipad, I ask for your help.