We have bought a house from the '59s where the inner and outer walls are built from fiberboard clad with tretex. It's not particularly straight, as the walls have some irregularities both in height and width.

Now we are going to put new boards on this to have something even to paint on and something durable to screw into. I'm thinking of one layer of plywood and one layer of drywall.

I want to take this opportunity to make the walls straight and even, and ideally stronger than today. How can I mount the boards on the old wall to achieve this? Any filler material? Spacers?

The walls are built from 72mm thick and about 30cm wide modules with narrow wooden studs along the long sides and then three standing fiber planks in between, so I would like to anchor the plywood to each such stud for maximum stability.

Any smart tips would be appreciated!
 
Buy masonite and cut it into suitably wide pieces. Then it's just a matter of experimenting until you have support everywhere and it's straight.
 
It sounds complicated, but I wasn't expecting any simple solution, of course. :) Maybe some kind of foam that you spray behind the new boards and that hardens and becomes rock-solid...
 
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