whats going to be the best way to support a loft 9' in the air. what about 2x6 vs 2x8's? it'll be spanning roughly 14' wall to wall. would a "patio" style wall bracket be enough? I will be running them on the 16" centers as the walls are already done that way. then sheeting the top with plywood of some type, will 1/2" be enough for flooring?