may qualify me to give this answer as go ahead.
But, you then negate the "floating" basement wall theory. Making one independant from the other will stop what is happening to one from spreading to the other.
Taping into the ceiling/floor joists of the house will cause the basement walls to do what the house does, which it may anyway.
I don't know a thing about basements because in my region they will NOT work. But if it was mine, I would make them independant of each other.
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