How to find ceiling joists beneath plaster lath and plaster?

Finding ceiling joists beneath plaster and lath can be challenging, but it's possible with the right tools and techniques. Joists are typically spaced 16 or 24 inches apart, running parallel to each other. Here are some simple steps to locate them:

1. Use a Stud Finder: Modern stud finders can detect density changes through plaster, helping locate the joists.
2. Knock Test: Lightly tap the ceiling with your knuckles or a hammer. A solid sound indicates a joist, while a hollow sound indicates a gap.
3. Probe with a Small Nail: In inconspicuous areas, gently probe the ceiling with a small nail to confirm the location of a joist.
4. Look for Fixtures: Ceiling fixtures like lights or vents are often mounted to joists, providing clues to their position.

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