I'm not sure where you live, but where I live in the UK, every house I've lived in has had a concrete floor. All 1960s - 1990s houses. Internal structure is def

I'm not sure where you live, but where I live in the UK, every house I've lived in has had a concrete floor. All 1960s - 1990s houses. Internal structure is definitely not a wooden frame, it is brick, wood is used for decoration, floor boards and the roof. Maybe modern houses are built as you say