Hi, I have an old property that has 6x2 floor joists on 16 inch centres. The complete span of the house is 21ft. There is a steel beam in the centre of the room that I want to remove and relocate further back at around 15ft. So the longest unsupported span would be 15ft and then the rest would be 6 ft. Now I know i should be going deeper and wider with my joists but I don't want to affect the ceiling height below or raise the floor above. Could I add more 6x2 joists to spread the load?