[TagNBee]

40 foot is a big span exspecially because you want it to hold real weight. I am assuming that you want them clear spanning. You will probably be forced to use a floor truss. If your willing to put a wall down the center of the bottom floor you could use TGI beams or something simular. I have a very good friend who designs trusses for a living. If you would like to visit with him , let me know. Tag