>>512602188
In Britain it's usually a cavity wall and floorboards. The floorboards can be chipboard because it's easy enough to lift a carpet and slap new ones down, the increased span and low cost makes up for the shittier material not lasting. Softwood is going to be squeaky in no time, if you're going for real wood it'll be hardwood and you're paying through he nose for it.
As for Europe it depends on climate. You're not going to see the same shitty stucco-box regardless, like you do in the western US. Holy shit when the Spaniards are building better houses you know you're in trouble.