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.
Best Answer
First off, opening a common wall between two separate living units is fine if you occupy both units. It is however against most fire codes to have such a doorway between separate units. Now that you are selling one, you will need to reframe the opening and cover BOTH SIDES with the proper fire rated sheathing, ie: 5/8 or two 1/2 inch pieces of drywall.
To do this, you should frame the opening with 2X4's on sides, top, and a center stud. Attach the drywall as you would for any other interior wall. Tape the seams and use joint compound to smooth the joints. Refinish/paint etc. This will restore the wall to it's original specification. Anything less than a proper fire rated repair should/would be picked up by a competent home inspector and will have to be repaired properly before you can close on the sale anyway. Good luck.