Adding to existing raised wood foundation
I am adding a room onto the back of my house that's on a crawlspace. The addition will also have a crawlspace, and the joists will run perpendicular to the existing structure. My concern is tying the new joists into the old structure. Since the sill plate on the existing structure isn't available, I'm not sure how or where to attach the new joists. Digging a trench to pour a new footing adjacent to the existing footing seems like a really bad Idea, and simply attaching the new joists to the outside of the existing band joists doesn't seem like it would be sturdy enough to carry a load. I'm sure this has been done many times before now, but what is the proper way to do this?