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So this is supporting attic from both sides and roof from one side?
What is the city and state so I can look at snow loading?
What is the attic joist length on each side? It sounds like 12' on one side and 5' on the other.
What is the rafter length on the side supporting the roof?
Supporting the attic and roof, you can plan for a 5.25" x 14" 1.8E LVL to limit deflection to L/360.
Hello. Do you have any other questions for me on this topic? If you could rate my answer, I would appreciate it.