removing bathroom wall tile w/o killing the drywall?

:tup:

that turned out nice.

so i pulled all the old walls out this weekend, and found steel lines in the walls :bloated:
theres copper in the basement, but when it made to the turn to go up the wall they left the old plumbing. anywho just finished the copper last night and need to toss in the new tub and start hanging green board.