I am building a 2 story garage the outside dimensions of the garage is 30'deep and 34' wide. I wanted a clear span in the garage area so I chose to use parallel chord floor trusses. I will be installing a 42" stairwell. My question is about using a girder. Since the stairs will be against the outside wall and the truss layout will put two trusses within 4" of each other rather than tripleing the trusses I wanted to have girder pockets installed on the ladder truss and the first two on the other side of the stairwell. My thought was I could set the girder on the outside wall and pass it through the first two trusses on the other side of the stair well to distribute the load even though they are not side by side.
Will this work? What size 2x material would I need to build the girder? (there will be 3 trusses dead-ended into the girder a 42" span) How would the bottom chord of the dead-ended trusses carry any weight? Should I use steel strap for the bottom chord or end nailed or nailed up through the bottom chords? How to you specify to the manufacturer where you want the pockets for the girder? (by the size of the stairwell or end of the truss? I'd also want the webs to line up so do you need to specify from which end of the truss?
I also need to brake the stairs on a landing. Rather than a stiff leg support under the landing my thought was I could suspend the floor load by a 1 1/2" steel pipe passed through the bottom chord of the 8 over 4 roof trusses. I am concerned that I do get a large point load on that corner of the landing. Any Ideas or suggestions? or should I just go with the conventional stiff leg to the floor?