What do you think these boards behind the wallpaper could be? (see pictures) Behind the boards, there are upright planks at least.

It will obviously be insanely difficult to wallpaper on this surface, but what should I do? Tear down these boards and replace them with drywall, or should I perhaps let them stay and put drywall on top of them?

Can anyone advise me?
 
  • Torn wallpaper reveals wooden panels underneath, questioning whether to replace the panels with drywall or install drywall over them.
  • Close-up of a wall showing layers of wallpaper being peeled back, revealing wooden panels or boards underneath, with visible screws.
Seems to be tretex (however it's spelled now).
 
Agree. Looks like treetex. Put renovation plasterboard on the treetex and wallpaper on the plasterboards. Take down the treetex if you feel like it. It might be good to remove the treetex if you suspect any old or ongoing water damage.
 
Thank you for that, then it was as I suspected!

....and immediately the lazybones in me started creeping. :D Do you believe in removing as much of the wallpaper as possible and then putting renovation plasterboard on top? I mean leaving "a few remnants" of the wallpaper in place, that probably doesn't matter, right? *fingers crossed*
 
Wallpaper remnants don't matter much unless there are large differences in thickness with and without wallpaper.
 
Tear down the tretex, it's often held with small nails only. Then screw up the drywall :)
 
Let the tretex remain. If it's properly nailed, it's secured with pappnubb. Small nails with small heads cannot keep this board in place. An argument for keeping it is that it has good insulation value. It insulates as much as 45 mm of solid wood. Some are afraid of this board due to fire risk. It burns well, but there's more in the home that does the same. Instead, place a regular plasterboard on top. I find renovation plasterboard way too expensive.
 
It's fine to spackle and wallpaper on these!
 
Judging from the right picture, it is indeed, as JanneL wrote, attached with tacks. And if they are nailed like mine were, there are maaaany tacks/board. If you tear down the tretex, the tacks will most likely go through the board (due to Murphy's law :() and remain stuck in the underlying plank wall, leaving you with lots of tacks to pull out or hammer in.

I performed this maneuver when I renovated the bedroom on a wall that was covered with these boards. Not fun...

Next is the living room, and then it will be regular 13mm drywall directly on top of the wallpaper and tretex on all the walls without windows. For the window walls, I have to tear down the tretex so it aligns with the frames when the drywall is up.

//Daniel
 
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