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You didn't mention if there is plywood fastened to the top of your ceiling joists. If not I suggest you add that (5/8" is good) with the long span perpendicular to your C.J.'s with full depth blocking at 1/3's of the C.J. span . Use 16d at 6" plywood to joists. This creates a de facto...

Yes, the "hinge" is the issue. Diagonal bracing from the wall plate works, but I prefer full height gable end walls where the heights are manageable.

My usual source (Gypsum Association Fire Resistance Manual)doesn't have a good "fit" as I am working with an existing kitchen floor that we can't carpet to get a 50 STC. Pouring a gypsum sub-floor (which works for a 50 STC) is impractical. Where can I check for alternate assemblies using...

Thanks for the advice. I shall search the earth retention engineering forum for information there.

We are an architectural firm that does structural and site engineering for some of our projects. Can anyone suggest a retaining wall design program for masonry-cantilever retaining walls? Is something like this available online?...or must a program be purchased which I don't mind. Thank you.