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I'd at least add some lower 2" x 6" collar beams and one or two steel cables as tie beams with turnbuckles (if the side wall has already bowed out then you can tighten the turnbuckle to bring it back to plumb). That will still keep that space realitively open. Just don't have any big guys walk on the roof in that area, like I said a two by four at that span won't hold much load, you can experiment on the ground with a two by four up off the ground on blocks. That way whe it breaks as someone steps on it they will only drop afew inches LOL.
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