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I just built a tool shed on a 5.5" slab that is 8x24, and started out to be 10' tall, but by the time put down 4 2x4s across the bottom and 3 across the top under the trusses, is closer to 11' tall. Is pretty tall. I put 4x8' lofts on both ends just above the doors, and one big one thats 8x8 in the middle. That way have about 4' open between the lofts at either end. That leaves me about 3' of loft space under the trusses. Since are the same width as the shed, my 2x4x8's are nailed into each of the wall 2x4x10's that the edges butt up against. At each end where meet the walls, brought down 2' long 2x4's on angles for additional support under each loft support. I thought about adding hangers as well, but thought better of having the weight pull down the roof trusses, although may not have. I'm 24" centers on the walls, so is pretty stiff. I'm a big fan of screwing that kind of stuff together, but for time (needed to get up), I settled for using 3" nails and a Bostich nailer. I figure with only 3' of loft space, not likey I'm gonna put anything real heavy up there, but would probably support it. If you use 2x4's across your 12' wide, and go into each of your wall studs that butts up against, you'll be surprised at strength once nail down 1/2" or better plywood shelving. 2x6's would be even stronger. I thought being 11' high was tall, now wish had gone taller. Make sure your walls are anchored good in your slab. Steel roof is kind've expensive at first thought, but will pay for itself in the long run, and is only hard to work on if have saw dust on it, or temps dip near freezing - then is like sking without poles - make sure no shovel handles or fence posts sticking up down below, because they hurt bad. Mark
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