Re: Need HELP with patching a large wallboard hole!!!
The point of the wood backer is to give you something to attach the patch to as well as reinforce the joints. If you can't cut the drywall to the centerline of a stud, then attach the wood backer to the side of the stud (or bottom of the top plate if it's that close to the ceiling ). If wall framing isn't available to attach the wood backers to, then you can carefully screw the backers to the existing drywall. You do this by holding the backer behind the drywall and screwing through the face. Go slow and use care so that you don't weaken or break up the edge of the existing drywall. Once you've got the backers in place you cut your patch and screw it in place. The backer doesn't have to be 1x3, it can be 1x2 or even strips of 1/2" or thicker plywood.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!