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* Try to stick a push-pin or ice pick into it. Sheetrock/drywall is soft and the point should go in easily. Plaster is hard -- it will be hard to push the point in and the plaster will tend to crumble.

* Go into the attic and look under the insulation. Drywall is smooth. Lath is very rough. It's applied to strips of wood with gaps between. The plaster is squished between the strips to form "keys" that hold the plaster to the wall. See links. * Remove an electrical outlet cover and look at the edges of the exposed wall. You may be able to see the ends of the lath strips.

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15y ago
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11y ago

Remove a switch or outlet cover and you will see what it is.

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Q: How can you tell if your walls are plaster or sheetrock-drywall?
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