Good point - yes the walls not necessarily, but floors. There used to be a common community activity similar to "barn raising" - "building the plate" where aft

Good point - yes the walls not necessarily, but floors. There used to be a common community activity similar to "barn raising" - "building the plate" where after the homeowner DIYd the molds and rebar, the neighbors would come together and mix and pour concrete over the span of one day. Fun times.