plaster interior walls or space out ceilings first?

[JoakimJohansson]

I have cleaned the entire house and will put up new walls, lay new flooring, and new ceiling!

It's obvious that you lay the floor last after the walls.

But the ceiling;
I'm thinking of putting plastic on the whole ceiling first, otherwise, it's hard to make it airtight.
But then the question is whether you nail the upper stud of the interior walls to the ceiling joists or if you put up the furring first and then frame the interior walls?
What do you do?
It should be easier to do the furring first, also makes it easier with electrical wiring since you can run it "above" the walls?

 

[Mattias_Eson]

Sparse first. You won't have much left to screw the wall panel into otherwise.

 

[JoakimJohansson]

Sparse first. You won't have much left to screw the wallboard into otherwise

Aha, I hadn't thought about that... you mean it will be hard to screw the wallboards into the top rule otherwise? Is it really necessary then? Isn't it enough with the standing studs?

If you use studs after sparse, the studs that lie across the sparse are easy to attach, but the studs that lie along with the sparse, how do you attach it if it ends up between two spars?

 

[Mattias_Eson]

You can attach them to the rafters/beams. Then you can put a piece of gles between as a spacer.
Alternatively, you can place 2 gles there so that you have something to attach the ceiling to next to the wall on both sides, as you also want to create a frame around the room with gles.

And the boards should also be screwed at the top and bottom edges.