Interior wall on floor or joist?

[ZipLock]

If given the choice - should one build an interior wall so that it stands on the joist, or should one lay the floor first and then place the interior wall on the floor?

 

[SueCia]

I am currently facing major problems as I plan to switch to chipboard, but the existing wooden floor was laid on the subfloor before the walls were put up, which means I can't replace one room at a time because when I cut the boards closest to the wall, I compromise the structural integrity up to the next beam in the adjacent room, plus since the wall stands on the floor, it will sink simultaneously.

Additionally, I've read about something called flanking transmissions that make sound travel better in adjacent rooms if the floor is one large surface. I wouldn't hesitate for a second to raise the walls on the subfloor and then lay chipboard room by room. And as I understand it, you shouldn't let the chipboard nearest the door extend into the hallway but should cut it so that the hallway floor and room floor meet with a few mm gap under the threshold.

 

[ZipLock]

Right now, it's leaning towards placing the inner wall on the joist. I talked to a carpenter and a good argument he mentioned is that if you get a water leak, it's much easier to break up the floor if the inner walls are not sitting on the floor.

 

[SueCia]

Right now it's leaning towards placing the inner wall on the floor joists. I spoke with a carpenter and a good argument he mentioned is that if you get a water leak, it's much easier to break up the floor if the inner walls aren't standing on the floor.

I think that sounds like a very good argument too, sure you should of course assume you won't get water leaks, but shit happens. I think you're doing the right thing.

 

[MVJK]

I am facing similar choices at home but wondering how to set up the wall if it is to be parallel but between two beams?