Foundation settling- bolting blocks
I don't know how it holds up, but many years ago (as a young newly wed) my
wife and I noticed just about EVERY building in "old" downtown Charleston,
SC (which is on a wraparound waterfront) had large bolts/washers/nuts on the
outside at several levels. We presumed they were structural reinforcement
for these pre- (or, at least, early) USA buildings.
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