I am opening up my 1952s home and it is requiring redrywalling in a few places. Because of the age of the home, the drywall/plasterboard combo is about 3/4" thick. There are a few spots (one in particular) where the gap between the wall drywall and ceiling (where I took a wall out) is between 3/4-1". What is the best way for me to make this joint? Can I just use a corner bead and load it up with compound to fill the gap or should I cut a little 1" strip of drywall to fill that space?
Also, is it possible for me to just mud over a 2x4 that is flush with the drywall around it or do I have to figure out some way to put drywall over the top of it first? Can I just put a couple layers of mesh tape on it?
FIll in the gap with drywall strips if you can. That is a big gap to try to mud, which would be more prone to cracking.
It might be too late, but when removing the old plaster, just fur the wall to be drywalled with 1/4" plywood strips. This brings the new surface back to the original 3/4 thickness. (1/2" drywall + 1/4" furring strip)
Don't mud over a 2x4. I'm having a hard time imagining why you would have drywall up against a 2x4 like that. Take the extra time to do it right.