my previous framing experience was either in my basement or outside on my shed, both on concrete underlayments. now, i am getting ready to do a room upstairs that rests on wood beams. the walls are all masoned.
i plan to set 2xX inside framing to hang drywall and fixtures on. my questions are:
1. since they are non-load bearing walls, can the X above be 3 rather than the conventional 4, to save space?
2. this sounds rudimentary but do i first set the subfloor and then sole plates on top of it or should sole plates be to the structural beams and then the subfloor between them?