Drywall or joint compound joint downstairs/upstairs.

[Gårdsboende]

Going to cut into this wall to run PEX to the upstairs bathroom. Something that has bothered me during the 2 years we've lived here is the terrible moldings in the middle of the picture that cover the joints of drywall against the beam (green in the picture). My thought is if I can add a layer of renovation drywall on top of this to remove the seam? I'm concerned about the risk of it cracking since the house might move.

The house is a wooden house, Götenehus, built in '91, crawl space that is about 70% on rock.

 

[rävlyan]

They are probably there so that the connection on the staircase to the wall and floor joists is not visible. It's likely a 200 mm floor joist, and you might be able to put renovation plasterboard that goes down over the upper joint to the wall and not attach it to the lower part, allowing for movement if needed. But you might get an edge at the bottom that needs to be concealed, perhaps suitable with a trim that presses against the board. Just a thought from me, you decide yourself.

 

[Gårdsboende]

They are probably there so that the connection on the stairs to the wall and floor joist is not visible. It is probably a 200 mm floor joist, you might be able to place renovation gypsum that goes down over the upper joint to the wall and not attach it to the lower part, allowing it to move if it wants to. But you might have an edge at the bottom that needs to be covered, perhaps suitable with a strip that presses on the board. Just a thought from me, you decide yourself.

Do you think plastering all the way from the stairs up to the ceiling risks cracking?

 

[rävlyan]

That was what I meant by plastering all the way but not locking the lower part against the joists, if there is a small movement, it won't crack.

 

[Gårdsboende]

That's what I meant, to plaster all the way but not secure the lower part against the floor joists. If there's a small movement, it can't crack.

Ok, yes, my thought was then to wallpaper, but maybe I'm tempting fate.

 

[rävlyan]

Don't think that you're challenging anything if you have plaster all the way, it's like regular walls from floor to ceiling with joint compound between them. It's at the joint between floor structure walls up and down that it could move.

 

[Lars48]

I would plaster the entire wall, cut out the plasterboards at the joint, apply fiberglass tape, spackle, glue fiberfilt (microlit) primed and paint over.