Excuse me, but apparently you didn't pose the original
question, so how would you know the answer to
why he's doing it? It's not to locate studs, because he
clearly said in the post that he "already knows where the
studs are". That's why some of us asked the question.
He replied above that he wants to locate them to remove
the drywall. Which is a new one to me, as removing the
drywall seems like a losing proposition to me. If you don't
plan on trying to re-use it, then you just rip it off. If you
try to re-use it, first it's going to take a long time to screw
around locating the screws, then unscrewing it, removing
it, etc. And then the taped joints are probably going to
come apart a big mess, with the paper tearing, etc. And
they will still be covered with the old mud, uneven, etc and
will not be a clean new joint to tape and cover. All in all,
given the cost of drywall, the time involved, and how new
drywall will be easy to mud up and deal with, it sure
doesn't seem like a good idea to me.
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