Steel frame for a deck
I would like to build a second floor deck on my two story home. I wanted to use steel bar joist and steel i beams to form the frame then apply composite decking boards to the top of the bar joist. The deck would be 18' long and 14 ' deep.
As it would also serve as a roof for my first story patio the bar joist needs to support the roof members to cover the first floor patio . How tall would the bar joist be?