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Oof, that’s rough.
About 30 years ago we had the exterior foundation excavated down to the non existent weeping tiles (surprise!). Tiles were put in, the walls had 2 inches of SM insulation added, the whole thing was waterproofed, and then river rock was added as fill up till just under ground level.
All this to say that our basement is unfinished (we ripped all the sketchy shit out when we moved in) and we have cracks similar to yours that haven’t changed or leaked in all that time.
Make sure the outside pressure from clay is mitigated if it hasn’t already been.
Depressing situation.
Basement flooded and drywall was wrecked.
Removed rotten drywall and found big crack in foundation. $30,000 repair, and climbing fast. Also water was seeping in and basement has a lot of disgusting mould.
I have filled a big garbage bin with drywall, 2x4 studs and mouldy fibreglass insulation. Should be able to get the remainder to the dump myself.
In August this was a nice finished basement with my home gym, laundry room and huge spare bedroom.
It’s wild how life can drop stuff like this on you out of nowhere.