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This Old House - How to Hang a Heavy Mirror | Ask This Old House

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Short Summary

Main recommendation: For a heavy mirror on a wall, first identify whether the wall is plaster and lath (typical in homes from the 1940s or older) or drywall, then use a fastener rated above the item's weight, such as a toggle bolt for plaster or a suitable drywall anchor for drywall. The video demonstrates weighing the mirror with a bathroom scale (about 30 pounds), using two fasteners for stability, and marking hook positions with a level and a centered scrap of wood.

Key Points

  • Check the wall type first: plaster and lath is brittle, so drywall-style hangers can damage it.
  • For plaster and lath, the video uses a spring-loaded toggle bolt with a picture hanging hook, installed through a pre-drilled hole.
  • For drywall, options named include plastic molly bolts, toggles, and large screws driven in with a hammer and then set with a screw gun.
  • Each fastener has a maximum weight rating, so weigh the mirror first; the example mirror weighed about 30 pounds and the chosen fastener was rated for 30 pounds.
  • Using two hooks adds redundancy and lets the mirror be shifted slightly left or right while keeping it from going askew.

Details Worth Noting

  • Concrete instructions:
    • Determine the wall type. If it is plaster and lath (older homes, roughly 1940s or earlier), drill a hole first, push the spring-loaded toggle bolt through, pull back and tighten it with a screwdriver from the front until snug against the lath, then hang the picture hook on it.
    • If the wall is drywall, drive the large screw anchor in with a hammer, then screw it in with a screw gun, back it off slightly, and hang the picture on it.
    • Weigh the mirror with a bathroom scale and choose fasteners rated for at least that weight. Two fasteners were used for a 30-pound mirror, each rated for 30 pounds.
    • Decide the top edge position on the wall, then measure down about 5 inches from the mirror's top to the wire's attachment point for a two-hook setup. (With a single hook, the video says to measure down about 3½ inches.) The exact distance depends on hook spacing: wider spacing lowers the wire, closer spacing raises it.
    • To locate the hooks, center a 12-inch scrap of wood on the mirror's back, hold it tight to the wire, and mark the wood's centerline at the 5-inch point on the wall. Line the wood up on that mark, use a level to make it level, and mark both ends for the hook positions.
    • Tap the hooks in so the bottom of each hook sits on its mark, then hang the mirror.
  • Toggle bolts in plaster should be installed from the front with a screwdriver until tight against the lath; the video demonstrates pulling back on the spring-loaded nut before tightening.
  • The video describes the two-hook approach as "belt and suspenders," offering both redundancy and positional adjustment.
  • The fastener weight rating is the key limit; choose anchors that exceed the item's actual weight.

Bottom Line

Identify your wall type, weigh the mirror, choose fasteners rated above that weight, and use a level and centered measuring guide to place the hooks accurately before hanging.