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The tin ceiling in this project (Image 1) was installed directly over a "textured" ceiling. The original small-profile crown molding was left in place. This project installs tin crown molding over the existing crown molding.
Put a piece of tin molding in place and make a mark on the wall at the bottom edge of the molding. Measure the distance from the ceiling down to the mark (Image 2), and transfer those measurements to the other corners of the room.
Snap a straight chalk line. Then snap lines lengthwise across the room (Image 3). Check for level across the whole room.
Use a hammer and a chisel to chip away any old corner bead pieces, so that the bottom of the new tin molding can sit flush to the wall. Make sure all drywall texture is sanded away from the line where the new molding will sit to insure a flush fit to the wall.
Use a brad nailer to attach the molding to the wall, keeping the pieces aligned on the chalk line and flush against the corners where the walls meet. Use the same nailer to attach the molding to the tin ceiling. Overlap the joints as you go along so that the patterns match up. In the corners, carefully cut 45-degree angles in the molding. After installation, use matching-color caulk to fill any errant cuts or holes.