The green dotted line shows where the masking tape outline would go if you were just removing part of the plaster and lath. In the picture shown here, the technique is right for removing all of the plaster from the wall, but wrong for removing only a section of plaster. Pull out the remaining lath by hand, hammer, or with the pry bar.You want to contain your operations to the center of the square. The reason you nailed down loose lath is because the vibration from the saw can transmit to the lath…and knock out pieces of the “good” plaster outside of the masking tape square. Cut out the lath with a reciprocating saw.This may seem ass-backwards, but if you have any loose pieces of lath-nail them down.Do this until all the plaster within the masking tape square is gone. This should help separate the plaster at the score lines. Use the broad side of a piece of 2×4 as a buffer, and tap along those perimeter plaster areas with a hammer.When you get near about a 4-inch border near the outline, leave it be.Chop out the inner part of the square with a flat prybar.You don’t want to score all the way down to the lath (that’s pretty impossible anyway), but just about 1/8 inch down. Use a straight edge to score through that layers of painter’s tape, and down into the plaster itself.
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