I am renovating two rooms where there were previously hardboard panels on the walls, which will now be replaced with drywall. However, the studs are quite uneven and need to be adjusted before I can screw up the drywall panels. But I'm not really sure how to do it. The studs are glued and nailed to the hardboard panel that is the wall into the adjacent room, so I have no way to adjust their position. There is quite a few millimeters difference when I place a straightedge against them, see pictures.

Any tips on how to solve this? How much difference is acceptable to install standard 12.5x1200x2400 mm drywall panels? I've considered either planing the studs that "stick out" or installing new studs that extend beyond the old ones.
 
  • Uneven wooden studs against a wall, highlighted by a straightedge used to measure irregularities before gypsum board installation.
  • Wooden studs with uneven surfaces exposed after removing masonite, next to a straight edge tool showing misalignment during room renovation.
  • Wooden wall studs and exposed wiring on an unfinished wall, showing uneven placement, awaiting gypsum board installation, as part of a room renovation project.
I usually have some leftover pieces of fiberboard lying around to use as shims in such situations. It usually doesn't matter much what type of spacer it is as long as they support the drywall and the drywall screw can go through them.
 
B Byggmarodören said:
I usually keep some scrap pieces of fiberboard around for shimming in situations like these. It usually doesn't matter what type of spacer it is as long as they provide support to the drywall and you can drive the drywall screws through.
I've read similar tips in other threads, but I don't quite understand how that's supposed to work. Don't I need to shim the entire length of the studs to the right thickness? It doesn't seem so easy to achieve.
 
Place a new board next to it, nail it to the one already there, or plane down the ones that stick out with an electric planer.
 
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I renovated two rooms in a townhouse earlier, and there the studs had warped and aligned poorly, but there it was significantly different.
I stripped up masonite and glued one or two strips on the studs that needed it. On some studs, it was only partially covered with masonite.
Glued with construction adhesive.
Then I used a belt sander to bring down the level where needed.
It turned out well enough to install new drywall.
 
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