I am in the early stages of a planning a loft conversion and I need some advice with regard to the steel usage to support the new floor joists. My house is detached and has a hip roof on each side (i.e. no gable ends). I am confused as to how I can install steel to give me maximum loft space, as there are no walls to support the steel at each end of the required space, and only in the middle. Can anyone help me?