I own two adjacent condo units and I opened a small doorway (24"x80") on the common wall for convenience.
Now I've sold one of the units and need to close the doorway. I recall the wall was simply double drywall on both sides.
My question is: How to close such a large opening? If I can still use drywall, how to secure the pieces to the rest of the wall?
One extra bit of info: one side of the wall was covered by large mirror glasses, and I can easily reattached one glass piece to conceal whatever I do with the doorway (I won't leave it open, of course). But other side of the wall is simply wall-papered so I have to come up with a good way.