We have bought a house and in one of the rooms, there's a large square cut out of the wall. I don’t know if it was to check for asbestos in the wall or something?

How should this be fixed before painting/wallpapering this room so that it becomes structurally sound?

Square cut-out in a wall showing insulation, surrounded by patterned wallpaper. A hand holds a piece of wall with patterned wallpaper, showing a cut-out section inside a room being renovated.
 
We had a pellet stove and got a large round hole, the neighbor fixed it by first making it square, then he inserted new studs around the hole so there was something to screw into, then new drywall sheets and screwed these and plastered.
 
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You can glue that with something like Tec7 or something.
 
Glue in the plaster?
 
Cut a couple of studs slightly longer than the width of the hole. Wiggle them in behind and screw them in place. Then simply screw the 'hatch' onto the studs.
 
useless useless said:
Cut a couple of studs slightly longer than the width of the hole. Wiggle them in behind and screw them in. Then just screw the 'door' into the studs.
Won't the insulation be in the way of that solution? And should the studs be screwed into the current studs or should they just be screwed into the wall in the same way as the "door"?
 
A bit hard to see in the pictures, it looks like masonite on particleboard on renovation gypsum?
That sounds a little too wrong to be correct. :)
Can you describe the materials?

A common hole in gypsum is easiest to repair as described above by making the hole square (done) and then screwing or gluing gypsum pieces to provide something good to fasten the "hatch" to.
 
A Adkit said:
Won't the insulation be in the way of that solution? And should the studs be fastened to the current studs or just fastened to the wall in the same way as the "hatch"?
The insulation can be compressed a bit. They don't need to be thick studs, a 22*45 or similar is sufficient.
Screw (possibly with a dab of glue) into the existing wall only.
 
Dowser4711 Dowser4711 said:
A bit hard to see in the pictures, it looks like some sort of hardboard on chipboard on renovation plasterboard?
That sounds a bit too wrong to be correct. :)
Can you describe the materials?

A typical hole in plasterboard is easiest to repair, as described above, by making the hole square (done) and then screwing or gluing plaster pieces to give you something solid to attach the "hatch" to.
Do you mean hardboard (where the wallpaper layers are) on chipboard (the thick wood piece) on plasterboard (the thinner white)? I don't know much about this kind of thing, but it seems right. If it's "wrong" for a 50s house, I don't know, but the wall hasn't fallen down yet.
 
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