- 1). Scan your wall with your magnet, starting from one corner and going horizontally to the next. Hold your magnet just above the surface of the wall to prevent marring.
- 2). Mark the locations with a pencil where the magnet detects something. An expansion joint should be a few inches wide, and run floor to ceiling.
- 3). Scan the marked locations with the stud finder to determine the exact edges of the expansion joint. If it doesn't run from floor to ceiling, it may be something else behind the wall, and not an expansion joint.
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