To the original post
In the SoftPlan Wall Definition dialog:
If the outside of the wall sheathing lines up with outside of the ring joist - set the wall sheathing up as a bearing material.
If the inside of the wall sheathing lines up with outside of the ring joist - set the wall sheathing up as a non-bearing material.
Hello John, hope you are well, Sir!
As to this man's question, you are exactly right, this issue is resolved and delineated within "Definitions" of the wall system. In that area, you can specify extensions inside, outside or both surfaces. You can also turn off the extensions or dimensions on the outside surface of the studs, and or plate. In this way, you shouldn't have the issue of extensions being from the edge of the plate, rather than the outside of the sheathing, in this mans issue.
As to the reality of that practice, in the Southeast Coastal areas, Wind Loads and Uplift are concerning factors. As such, engineering has to be done to accomplish their calculations and determinations. With that in mind, if the Ring Joist is flush with the outside of the exterior sheathing, then some type of flat Simpson Strong Tie strap would be required, at least down here. For that matter, in higher wind zones, that strapping is required on top of the exterior sheathing (OSB) anyway. I have always believed that spanning a floor joist system with the sheathing, without a joint, was a much better practice. Do most framers do that? NO! But, if the builder were going to build the house in that manner, and an engineer was involved, he would need to be informed as to that intention to calculate the correct loading and requirements.