Hey 53 4me, you mentioned that you have a steel beam in the center? I have an existing garage 30' x 30' that I want to raise the roof, so I'm thinking of putting an I-beam in the center to support the floor joist. I was thinking of using .250" thick x 3"w x 6"h. I think that should hold the upper deck that I'll be using for storage for the wife's craft material and my spare fenders, hood and all. I even plan to install a "dumb" waiter using a 440lb electric hoist (that they sell in Northern Tools) to get the big bulky parts up there. What do you guys think, that I-beam going to be strong enough?