Here, we specify a bituminous moisture barrier coating on foundation walls below grade, and often a perforated drain pipe as well. And bathrooms get specially-treated water-resistant sheetrock and even sometimes pressure-treated framing.
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All new builds have those probably mandatory now, and it’s of course not as costly when done at that point. I believe back in the day the only water repellant coating around foundation would be something tar based and that’s surely long gone now after 70+ years.
Fo rusre, older homes may not have even had modern material options, and while old-timers in many ways built better, there have also been definite advancements in other ways.
Other than electrical appliances and bathroom with running water in the main house, I haven’t yet found anything modern that is better than what they used to make 😅