after seeking the advice of a structural engineer and the handyman who helped us do it. The structural engineer specified two 12 X 12 X 1 3/4 microlams. We were going to have the microlam support the 2nd floor's roof and its joists, with the joists (about 10, spans of 9-12 feet) hanging from it. Because we didn't want the microlam to hang down past the ceiling line of the two rooms we were connecting by removing the load bearing wall, we put the microlam *above* the joists, so that the rafters of the 2nd story (which slope) rest on top of the microlam about 2 feet in from where they terminate. Only that part of the roof needs supported, as the other room, an expansion, has its own self-sufficient roof system. The house is kind-of a patchwork of areas, and so its hard to explain. Anyway--the joists are currently hanging on a 2X6, which has a 12 ft. span. We are going to put a 2 X 4 behind it for a little extra stability. Our next move is to secure the joists to the microlams with joist hangers, and then to also secure them more to the 2 X 6 with another set of joist hangers.
My question: does this sound like a good system? Would you have any advice for further beeing things up???