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Mounting a TV on plaster walls (without cracking them)

Three rules for safely mounting a 65-inch TV on a 95-year-old plaster-and-lath wall.

·5 min

Mounting a TV on plaster is mostly a question of finding wood. Behind your plaster is a layer of horizontal wood lath strips, and behind that are vertical 2x4 studs (usually 16 inches on center, sometimes 24 in older bungalows).

Rule 1: never trust a stud finder alone on plaster. The horsehair and wire mesh in old plaster confuses cheap finders. Use a small finishing nail to confirm before you drill.

Rule 2: drill slowly with a masonry-friendly bit. Plaster crumbles if you punch through it. A slow drill with light pressure makes a clean hole that the lag bolt can grip.

Rule 3: spread the load. A TV mount that engages two studs is dramatically safer than one that grabs a single stud plus toggle bolts. We mount everything two-stud minimum.

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