Welcome to R2R!!!
You have received very sound advice so far.
Get a structural engineer to evaluate but they will likely give you the green light if placed perpendicular to the joists and against a load bearing wall. As has already been stated, it will be dependent upon the quality of the workmanship of the builder. I do home inspections and I have stories of some of the things I see. It is what you can't see that bites you in the rump.
Keep us posted.
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